MARTI ELECTRONICS STL TRANSMITTER MODEL STL 10A. October,

Transcription

1 MARTI ELECTRONICS STL TRANSMITTER MODEL STL 10A October,

2 INTRODUCTION STL 10A 1 SPECIFICATIONS 3 UNPACKING AND INSPECTING 5 INSTALLATION 5 STL 10A TRANSMITTER INSTALLATION 5 ANTENNA INSTALLATION 6 STL ANTENNA INSTALLATION CHECKLIST 6 ANTENNA ASSEMBLY 6 TRANSMISSION LINE CONNECTOR ASSEMBLY 6 MOISTURE PROOFING COAX CONNECTORS AND FITTINGS 6 LOCATION AND GROUNDING OF COAXIAL CABLE 7 SYSTEM GROUNDING 7 ANTENNA INSTALLATION AND ADJUSTMENT 7 OPERATION 7 SWITCH AND METER FUNCTIONS 7 TRANSMIT OFF SWITCH AND LED 7 FORWARD REFLECTED SWITCH AND RF POWER METER 8 PEAK MODULATION METER 8 TEST METER 8 PRE EMPHASIS SWITCHES 9 FREQUENCY MEASUREMENT 9 STL 10A PERFORMANCE TESTS 9 NOISE 10 DISTORTION 10 FREQUENCY RESPONSE 10 STL 10A THEORY OF OPERATION 10 POWER SUPPLY INPUT/OUTPUT FILTER A 10 CONTROL BOARD AUDIO BOARD MODULATOR MULTIPLIER BOARD RF POWER AMPLIFIER B AND B 11 DUAL LINK STEREO STL 11 TEST EQUIPMENT 14 TOOLS FOR ALIGNMENT OF STL 10A SERIES TRANSMITTERS 14 Marti Electronics 2000 ALL RIGHTS RESERVED Printed in the U.S.A.

3 TUNE UP PROCEDURE FOR STL 10A 14 MODULATOR CIRCUIT BOARD ADJUSTMENTS 14 STL 10A TRANSMITTER TEST REPORT 15 AUDIO CIRCUIT BOARD ADJUSTMENTS 16 MULTIPLIER CIRCUIT BOARD ADJUSTMENTS 16 RF POWER AMPLIFIER BOARD B AND B 16 ADJUSTMENTS POWER CONTROL POT CALIBRATION 16 B+ ADJUST 17 FORWARD POWER METER ADJUST 17 REVERSE POWER METER ADJUST 17 PA CURRENT ADJUST 18 FREQUENCY MEASUREMENT 18 1 STL 10A TRANSMITTER 1 2 STEREO STL SYSTEM BLOCK DIAGRAM FCC EMISSION PROFILE (500 KHZ CHANNEL) DRAWING 12 4 FCC EMISSION PROFILE (200 KHZ CHANNEL) DRAWING 13 5 STL 10A TRANSMITTER BLOCK DIAGRAM 19 6 STL 10A ADJUSTMENT LOCATIONS 20 7 STL 10A MAIN FRAME 21 1 STL 10A ELECTRICAL AND PHYSICAL 4 SPECIFICATIONS

4 WARNING THIS EQUIPMENT MUST BE OPERATED WITH A 3 CONDUCTOR GROUNDED AC POWER RECEPTACLE. FAILURE TO USE A PROPERLY GROUNDED RECEPTACLE MAY RESULT IN IMPROPER OPERATION OR A SAFETY HAZARD. LIMITED WARRANTY COPYRIGHT NOTICE The Seller warrants that, at the time of shipment, the products manufactured by the Seller are free from defects in material and workmanship. The Seller s obligation under this warranty is limited to replacement or repair of such products which are returned to Marti at its factory, transportation prepaid and properly insured, provided: a. Notice of the claimed defect is given to Marti with in one (1) year [two (2) years for STL systems] from date of original shipment and goods are returned in accordance with Marti instructions. b. Equipment, accessories, tubes and batteries not manufactured by Marti are subject to only such adjustments as Marti may obtain from the supplier thereof. c. This warranty does not apply to equipment which has been altered, improperly handled, or damaged in any way. The Seller is in no event liable for consequential damages, installation cost or other costs of any nature as a result of the use of the products manufactured or supplied by the Seller, whether used in accordance with instructions or not. This warranty is in lieu of all others, either expressed or implied. No representative is authorized to assume for the Seller any other liability in connection with Seller s products All Rights Reserved Marti Electronics No part of this manual may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language, natural or computer, in any form or by any means, without the prior written permission of Marti Electronics. Artwork depicting circuitry in this manual is protected by copyright laws. Information in this manual is subject to change without notice and does not represent a commitment on the part of Marti Electronics. Marti Electronics may make improvements and/or changes in this manual or in the product described herein at any time. This product could include technical inaccuracies or typographical errors. MAILING & SHIPPING ADDRESS: MARTI Electronics 4100 North 24th Street Quincy, Illinois The United States of America PHONE NUMBERS: Sales (817) Sales FAX (817) Service (217) Service Fax (217)

5 INTRODUCTION STL 10A. The MARTI STL 10A Studio Transmitter Link/Inter city Relay is a line of sight FM communications system providing a high quality broadcast audio channel with two optional sub channels. A dual link for stereo provides two identical broadcast quality channels with better than 70 db stereo cross talk and four optional sub channels. These systems offer greater rejection of interference, superior noise performance, much lower channel cross talk, and greater redundancy than currently available composite STL systems. APPLICATIONS OF THE STL 10A SYSTEM (FCC Approved Parts 74, 101): STL for FM stereo broadcast (dual system) STL for AM stereo broadcast (dual system) STL for FM monaural or AM monaural broadcast Inter city relay for linking two or more broadcast facilities Multi relay system for radio network distribution Communications link between satellite earth station and broadcast facilities Data and Background Music links Private microwave service Complex systems can be built from basic STL 10A transmitters and R 10 receivers having multiple relay (repeaters), bi directional (full duplex), and automatic switching hot standby features (refer to Figure 2). Features of the STL 10A Transmitter include: FCC approved under Parts 74 and 101. User selectable audio processing provides 0, 25, 50, or 75 microsecond pre emphasis options. Low pass filters designed to eliminate overshoot on complex audio waveforms. Calibrated RF watt meter for forward and reflected power. Test meter on front panel indicates Subcarrier Level, Supply Voltage, PA Current, For ward and Reflected Power. Additional test points are located inside transmitter. 1

6 2 FIGURE 2. STEREO STL SYSTEM BLOCK DIAGRAM

7 Automatic output power control. The power control maintains the output power to a specific level and is independent of temperature and voltage changes. Twelve segment bar graph for display of peak transmitter modulation. The five highest LED s (100% to 250%) have a peak hold feature which will display instantaneous peak value for one second, a valuable feature when dealing with pre emphasized program audio. Automatic switching capability by addition of Model ATS 15E Transmitter Switcher Accessory plug for external DC power, remote control, remote metering, and other functions Low power consumption for operation on AC, solar cell, battery, or other single polarity DC source. (Marti Model UPS 12 Uninterruptible Power System). Terminal strip for a balanced 600 ohm audio input, BNC jack for unbalanced audio, Sub 1, and Sub 2 inputs. The Marti STL 10A system derives its excellence from Marti s experience in supplying thousands of such systems world wide over the past thirty years. This equipment incorporates state of the art technology and is manufactured in modern, efficient facilities under high quality control standards. STL 10A System Specifications Freq Range MHz Receiver IF Bandwidth Maximum Maximum System Specifications Transmitter Power Deviation Receiver Frequency Response Distortion Noise STL 10/ watts ±50 KHz R 10/ KHz ±0.25 db, Hz 0.25% or less 80 db or better System specifications shown are for 200 KHz receiver IF bandwidth. Narrow band channels requiring 85 KHz IF bandwidth have ±0.25 db response, 0.3% distortion. System Applications Freq Range MHz B.W. Each Channel Frequency Response Distortion Noise FCC Channel Application Part Separation FM Stereo STL KHz ±0.25 db, Hz 0.25% or less 80 db or better 80 db FM Stereo STL KHz ±0.3 db, Hz 0.3% or less 72 db or better 72 db AM Stereo STL KHz ±0.3 db, Hz 0.3% or less 72 db or better 72 db Data or Background Music KHz ±0.3 db, Hz 0.3% or less 72 db or better 72 db channel Sat. Pgm. Feed KHz ±0.3 db, Hz 0.3% or less 70 db or better 70 db Stereo System Differential Phase 0.5 degrees or less SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE 3

8 TABLE 1. STL 10A ELECTRICAL AND PHYSICAL SPECIFICATIONS (Sheet 1 of 2) PARAMETER SPECIFICATION ELECTRICAL FREQUENCY BAND 850 MHz to 960 MHz as specified. MAXIMUM POWER OUTPUT 10 watts, ±0.5 watts,850 to 960 MHz. OUTPUT CONNECTOR UG 58 (Type N Female) OUTPUT IMPEDANCE 50 Ohms MODULATION Direct FM STABILITY ± % SPURIOUS EMISSIONS More than 60 db below carrier. AUTOMATIC CHANGEOVER Provision for automatic changeover by addition of ATS 15E Automatic Switcher AUDIO INPUTS Balanced 600 Ohms, +8 dbm, barrier strip. BNC connectors for unbalanced input. SUBCARRIER INPUTS Two BNC connectors for remote control and/or subcarrier inputs ohms unbalanced, 3 V. P P for 10% injection. METERING/INDICATORS Precision Peak hold Bar Graph Modulation Meter. Illuminated RF Wattmeter indicates Forward Power, Reflected Power. Test Meter reads PA Current, Subcarrier Level, 13.5 Volt Supply, and RF Drive 1, RF Drive 2. LED indicates Transmit. CONTROLS TRANSMIT switch, TEST METER switch, POWER ADJUST Pot. POWER REQUIREMENTS volts ac * Hz, 80 watts volt dc at 4 Amperes. AC POWER SUPPLY Precision, electronically regulated with current/temperature limiting. ACCESSORY CONNECTOR 15 pin D connector for dc power, remote control, automatic changeover and remote power metering. FUSE 4 Amp Slo Blo for 115 V operation Amp Slo Blo for 230V operation. Type 3AG. PHYSICAL DIMENSIONS 19 in.(48.26 cm.) wide x 3.5 in. (8.89 cm.) high x 14 in. (35.56 cm) deep. WEIGHT Net 11 pounds. Domestic packed 18 pounds. Net 4.9 kilograms. Export packed 8.2 kilograms. TYPE ACCEPTANCE NUMBER FCC ID: DDESTL (FCC PART 101 & PART 74) 4

9 TABLE 1. STL 10A ELECTRICAL AND PHYSICAL SPECIFICATIONS (Sheet 2 of 2) PARAMETER SPECIFICATION ENVIRONMENTAL OPERATING TEMPERATURE RANGE 20 C to +50 C ( 4 F to +122 F). * Voltage must be specified with order. ** Requires APS 28/18 Power Supply UNPACKING AND INSPECTING. This equipment was factory tested, inspected, packed, and delivered to the carrier with utmost care. Do not accept shipment from the carrier which shows damage or shortage until the carrier s agent endorses a statement of the irregularity on the face of the carrier s receipt. Without documentary evidence, a claim cannot be filed. Unpack equipment immediately upon receipt and thoroughly inspect for concealed damage. If damage is discovered, cease further unpacking and request immediate inspection by a local agent of the carrier. A written report of the agent s findings, with his signature is necessary to support the claim. Check your shipment against the shipping papers for possible shortage. Do not discard any packing material until all items are located. Small items are often thrown away with packing material. The packing material should be retained until equipment testing is completed. Any equipment returned to the factory should be packed in the original cartons, insured, and pre paid. INSTALLATION. INSTALL RACK MOUNTED EQUIPMENT IN A WELL VENTI- LATED, GROUNDED, AND SHIELDED RACK CABINET. Install rack mounted equipment in a well ventilated, grounded, and shielded rack cabinet. Do not locate solid state equipment in a rack above tube type equipment which produces high temperatures. Problems can also be avoided by locating this unit away from other equipment which has transformers that produce strong magnetic fields. These fields can induce hum and noise into the Marti equipment thus reducing performance. Strong radio frequency (RF) fields should be avoided where possible. Extensive shielding and filtering have been incorporated into this equipment to permit operation in moderate RF environments. All equipment racks, cabinets, etc., should be bonded together by wide copper grounding strap to ensure that all system elements are at the same RF ground potential. STL 10A TRANSMITTER INSTALLATION. 1. Program audio output is connected to balanced audio input screw terminals. Use shielded wire. Program audio level required is +8 dbm, 600 ohms balanced and isolated from ground. For dual channel stereo repeat instructions at second transmitter. Audio processing requirements will be discussed in OPERATION. 2. Connect a Remote Control or Subcarrier Generator (modulator) to the jack marked J1 SUB IN. The subcarrier source may be 50 to 600 ohms impedance, and the input level required is approximately one (1) volt RMS. Subcarrier frequencies may be between 39 KHz and 67 KHz. Systems factory supplied with 200 KHz IF bandwidths will carry subcarriers up to 92 KHz. For other subcarrier frequencies or narrow IF bandwidth systems contact the factory. A second subcarrier generator can be connected to J3. If a dual channel stereo STL is used connect one subcarrier generator to J1 on each channel s transmitter. 5

10 3. The accessory connector has several uses such as remote control, automatic switching, and external DC power. Connection instructions are furnished with these accessories. 4. Connect STL transmitting antenna coax to J6 ANTENNA. This requires a type N male connector. A short flexible jumper (20 max.) may be used between J6 and semi flexible coax. Marti Part No double shielded, low loss RG 214/U jumper is recommended. THIS EQUIPMENT MUST BE OPERATED WITH A 3 PRONG, GROUNDED, 115 VOLT, AC OUTLET RECEPTACLE. FAILURE TO USE A PROPERLY GROUNDED OUTLET COULD RESULT IN A SAFETY HAZARD OR FAULTY EQUIPMENT PERFORMANCE. 5. For dual channel stereo, use only Marti Part No , 20.5 inch double shielded jumper between J6 of each transmitter and the indicated connectors of the HRC 10B Series Combiners. Use a third Part No jumper between the ANTENNA connector of the HRC 10B and the semi rigid coax. Refer to Drawing Turn transmitter off. Connect the ac line receptacle on back of the transmitter to a 115 volt AC power source with special cord set supplied. Use only 3 prong grounded outlet receptacles. ANTENNA INSTALLATION. STL Antenna Installation Checklist. The following suggestions are offered to help those responsible for antenna installations avoid costly errors in assembly and adjustment. Marti Electronics Inc. assumes no responsibility for the installation and performance of antenna systems associated with the equipment. The following text presents a listing of some of the most frequently asked questions associated with the equipment. The text is not intended to be a complete step by step procedure. Antenna Assembly. Follow the manufacturer s instructions carefully. If no instructions were included with the antenna, call or write the antenna manufacturer for instructions. Errors are frequently made in assembly of the RF feed dipole elements which must be installed in the same plan as the reflector grids. In other words, if the reflector grid elements are horizontal, then the feed dipole elements must also be horizontal. Cross polarization of grid and feed dipole will result in total loss of antenna gain. Transmission Line Connector Assembly. Do not use RG 58 U or RG 8 U cable for STL station antennas. They have too much loss at VHF and UHF frequencies. Follow the instructions furnished by the manufacturer when cutting the coaxial cable. Inspect the cable ends for small metal fragments which can short circuit the line inside the connector assembly. Check the line for a short circuit condition after each connector is installed using an Ohmmeter. Pressurized line should be checked for several days under pressure before installation on a tower to ensure that there are no leaks in the line or fittings. Moisture Proofing Coax Connectors and Fittings. Extreme care must be exercised with coaxial cable before and after connectors have been installed to ensure that moisture does not enter the line. Foam dielectric line can absorb moisture absorption which is difficult to detect and remedy. Therefore, keep the line dry while in storage with the ends tightly capped. Coaxial splices, connectors, and fittings, to be located outside should be made mechanically tight, then coated with a weather proofing material such as SCOTCHKOTE over at least two layers of SCOTCH 88 vinyl plastic electrical tape. Moisture problems in antenna systems are usually traced back to connectors which have NOT been properly taped. The Marti K 1 grounding and weatherproofing kit is recommended for use in each new antenna installation. 6

11 Location and Grounding of Coaxial Cable. Keep the STL receiver coaxial cable as far from the broadcast transmitter and coaxial cable as possible. DO NOT STRAP RECEIVER CABLE TO THE MAIN ANTENNA CABLE AT ANY POINT. PLACE THE RECEIVER ANTENNA COAXIAL CABLE ON THE OPPOSITE SIDE OF THE TOWER FROM THE MAIN ANTENNA CABLE. Maintain maximum separation between these cables at all points, including the distance from tower base to transmitter building as well as inside the building. System Grounding. It is essential that the STL antenna system be properly grounded for safety and proper operation. Ensure the antenna system is properly grounded. Antenna Installation and Adjustment. The polarization of the transmit and receive antennas of the STL system must be the same. This means that if the transmitting antenna is horizontal, the receiving antenna must also be horizontal. Each antenna should be attached to the tower to allow for final adjustment in azimuth heading and vertical tilt. After visual adjustment of the antennas, the transmitter and receiver can be used to make the final adjustments of the antennas. With the transmitter driving one antenna, the receiving antenna is adjusted for maximum signal (indicated on the receiver) in both horizontal and vertical directivity. CAUTION: Antennas have a major and several minor lobes in their directivity patterns. A common error is to peak the antenna on a minor lobe, resulting in a signal level of only a fraction of the major lobe signal. This error can be avoided only by swinging the antenna through a large angle so that all lobes are evaluated and the major lobe clearly determined. After one antenna is adjusted, the transmitter and receiver locations are reversed, to allow adjustment of the other antenna. If an RF wattmeter is available, each antenna and transmission line can be checked for VSWR when the transmitter is supplying power to it. The VSWR should be less than 1.5 to 1 (1.5:1). If the antenna system fails to give the predicted signal strength level, check the following items: 1. Check for correct assembly of antenna. 2. Ensure the antennas have same polarity. 3. Check orientation of antennas in both horizontal and vertical directions. 4. Check VSWR of both the transmit and receive antennas. VSWR should be less than 1.5:1. 5. Check for required Fresnel zone path clearance at all points along radio path. 6. Check for obstructions in the path such as trees and man made structures. Do not depend on maps or aerial photographs. YOU CAN BE KILLED IF AN ANTENNA COMES IN CONTACT WITH ELECTRIC POWER LINES OR EXPOSED ELECTRICAL WIRING. FOR YOUR SAFETY USE EXTREME CAUTION WHEN INSTALLING ANTENNAS. KEEP AWAY FROM POWER LINES. OPERATION. SWITCH AND METER FUNCTIONS. TRANSMIT OFF Switch & LED. This toggle switch controls the RF output of the transmitter. The red LED above this switch is a visual indication that the switch is in TRANSMIT position. The audio circuits, the 13.5 volt regulated power supply and the meter illumination lamps remain on when the TRANSMIT switch is OFF. 7

12 FORWARD REFLECTED Switch & RF Power Meter. The RF POWER METER, with its selector switch, allows monitoring parameters within the transmitter as follows: 1. When switched to FORWARD POWER, the meter indicates the RF power output of the STL 10A transmitter. The maximum power is 10 Watts for the MHz band (United States). 2. When switched to REFLECTED POWER, the TEST METER indicates the amount of power returning on the coaxial line from the antenna. This is useful in determining the VSWR (Voltage Standing Wave Ratio) for the antenna system. The lower the VSWR for a given forward power, the better. Most antennas guarantee a VSWR of less than 1.5 to 1. The table below gives VSWR for various reflected powers: Forward Reflected VSWR Power Power 10 Watts ( MHz) 0.3 watts Watts ( MHz) 0.4 watts Watts ( MHz) 0.5 watts Watts ( MHz) 0.7 watts Watts ( MHz) 1.0 watts 1.90 PEAK MODULATION Meter. A peak hold twelve segment bar graph display is included on the STL 10A transmitter for setting and monitoring peak STL modulation (composite or mono mode). The five highest LED s (100% to 250%) have a peak hold feature which will display an instantaneous peak value for one second. This is a valuable feature when dealing with pre emphasized program audio. The procedure for setting peak modulation is to adjust audio input level into the STL 10A until the 100% bar is flashing on audio peaks. The 110% through 250% bars indicate over modulation and require a reduction in input level to obtain a 100% peak indication. TEST Meter. The TEST METER with its selector switch, allows monitoring of five important parameters within the transmitter as follows: 1. SUB LEVEL Indicates subcarrier injection. 0 VU is approximately 20% injection. For 10% injection use 6 VU. Subcarrier voltage at J1 or J3 is approximately 1 volt for 20% injection, 0.5 volts for 10% VOLT SUPPLY Indicates regulated voltage supply operation VU is approximately 13.5 VDC. 3. P.A. CURRENT The collector current of the final amplifier and its driver is calibrated to read 0 VU on the meter at rated power output and efficiency. The POWER ADJUST potentiometer should never be set to produce a P.A. current greater than 0 VU. 4. FORWARD POWER. The transmitter forward power level. 5. REFLECTED POWER. The transmitter reflected power level. 8

13 PRE EMPHASIS SWITCHES. Two programmable switches S1 and S2 on audio board enable the user to select flat, 25, 50, or 75 micro second pre emphasis characteristics. The selection of one of these options in the transmitter requires a corresponding selection of S1 and S2 on receiver audio board Refer to STL 10A adjustment location diagram at the end of this manual for the location of these switches. The switches, as shown in the diagrams, are positioned for 75 micro seconds at the factory. 75 micro second pre emphasis and de emphasis produces the best threshold noise performance in an FM system. It does however present problems in modulation control. Some users therefore may wish to use 50 micro second, 25 micro second, or flat processing. AM stations will find flat processing desirable since the STL can be treated as a pair of wires in proof of performance tests without possible overmodulation of the link at high audio frequencies. With 75 micro second pre emphasis, audio input levels to the transmitter should be reduced 20 db below 100% modulation when running frequency response tests to prevent overmodulation at the higher audio frequencies. With a full quieting RF signal into the receiver, flat pre emphasis will produce a system signal to noise ratio approximately 6 db less than 75 micro second pre emphasis. Received signal levels less than full quieting may produce a difference of as much as 13 db between flat and 75 micro second pre emphasis. FREQUENCY MEASUREMENT. The RF output frequency of this transmitter should be measured and adjusted as often as necessary to insure on frequency operation and to comply with regulations (refer to TUNE UP PROCEDURE in the following text). STL 10A SYSTEM PERFORMANCE TESTS. The STL 10A transmitter, R 10 receiver with the associated antenna system can be tested and compared with factory test data included in this manual. The following procedures should be followed in order to obtain reliable and accurate results. Before audio tests or subcarrier tests are begun check the receiver SIG. LEVEL METER for required minimum signal. A conversion from VU to microvolts is given under OPERATION in the R 10 receiver manual. For a 950 MHz system using 50 KHz FM deviation, typical noise levels are: 1 uv for 20dB S/N ratio 3 uv or 50 db S/N ratio 10 uv for 60 db S/N ratio 20 uv for 70 db S/N ratio 50+ uv for ultimate S/N ratio For the above system with 20% subcarrier injection, the following noise level on the subcarrier (Marti SCG 10 SCD 10 System) was measured: (no modulation main or sub). 10 uv for 40 db Subcarrier S/N ratio 20 uv for 47 db Subcarrier S/N ratio 30 uv for 50 db Subcarrier S/N ratio 150 uv for ultimate Subcarrier S/N ratio With ultimate S/N ratio, main to sub crosstalk should be 40 to 45 db (using Marti SCG 10 SCD 10 Subcarrier System). 9

14 NOISE. Noise measurements should be made first, since high noise levels will influence distortion readings. Also ground loops in the audio oscillator to transmitter connections and distortion analyzer to receiver connections must be resolved before testing begins. The influence of high RF fields upon the test equipment must be determined and corrected before accurate measurements can be made. NOTE: NOISE AND DISTORTION MEASUREMENTS ARE MADE WITH SUBCARRIER AND REMOTE CONTROL INPUT SIGNALS REMOVED. System signal to noise ratio is determined while modulating the transmitter 100% at 400 Hz. A level of +8 dbm across the balanced audio input terminals of TB 1 will produce a reading of 100% modulation on the PEAK MODULATION indicator. Set Receiver PGM LEVEL ADJ pot for +10 dbm output into the distortion analyzer. If the distortion analyzer has a high impedance input, add a 600 ohm load resistor to match the receiver. Establish +10 dbm on the audio voltmeter of the analyzer as the reference level for 100% modulation. Next, remove the audio signal from the transmitter input and measure noise level below reference (100% modulation). This reading should compare with that published under SYSTEM SPECIFICATIONS in this manual. DISTORTION. Harmonic distortion is usually measured at 100% modulation and at several frequencies. If pre emphasis processing is used in the transmitter with corresponding de emphasis in the receiver, it is normal for available audio level at the receiver to drop with increasing frequency according to the de emphasis curve selected. At 15 KHz, there is sufficient level to operate most modern distortion analyzers. Distortion levels should be within specifications. If distortion is out of specs, check system noise, check for test equipment ground loops, RFI, and transmitter/receiver operating frequency. If either unit is off frequency, the FM modulation sidebands are not centered within the IF filter bandpass, which can cause audio distortion. FREQUENCY RESPONSE. If the STL 10A System is switched to flat processing, frequency response can be measured as if the signal were being sent over straight wires. If pre emphasis processing is used (especially 75 micro seconds) allowance must be made in the transmitter audio input level to prevent over modulation at test frequencies above 400 Hz. The simplest and fastest method is to set the transmitter audio input level for 100% modulation at 400 Hz, then attenuate this level 20 db. Set receiver output level to 10 dbm as the reference, then sweep the audio band for response. Response should be within limits published in the SYSTEM SPECIFICATIONS. STL 10A THEORY OF OPERATION. Refer to the STL 10A block diagram in the DRAWINGS AND PARTS LIST section for the following discussion. POWER SUPPLY Power supply circuit board contains filter capacitor C5, and reverse polarity protection diodes D5, D6 and D7. The unregulated output voltage of this supply is volts. The voltage is supplied from bridge rectifier D1 4 on circuit board INPUT/OUTPUT FILTER A. Radio frequency filters are installed on all input/output circuits connected to ACCESSORY connector J4, as well as the AC line input. CONTROL BOARD Applies an operating voltage to the unit. 10

15 AUDIO BOARD The 600 ohm balanced audio input to the transmitter is connected to the inputs of unity gain differential amplifier IC 1A. Potentiometer R9 is provided for adjusting the amplifier to produce the maximum common mode rejection (CMR). The output of the differential amplifier is directly coupled to the pre emphasis amplifier. The negative feedback circuit of this amplifier has two capacitors selected by switches S1 and S2 which provides options of 0, 25, 50, or 75 microsecond pre emphasis. Following the pre emphasis circuit are two stages of active Butterworth low pass filtering. The signal is then routed to the MODULATOR audio input and to metering amplifiers IC 3A and IC 3B. The subcarrier input is routed to the MODULATOR subcarrier input. MODULATOR The MODULATOR consists of voltage controlled crystal oscillator Q2, buffer amplifier Q3, subcarrier modulator D2, precision voltage regulator IC 1 and oven heater control Q1. Precise frequency control is obtained by thermally coupling components Y 1, Q1, Q2, and IC 1 to temperature regulated frequency control module Coarse and fine frequency adjustment is provided by L1 and L2 while the main channel modulation is provided by a voltage variable capacitance diode in the frequency control module. Bias for this diode is obtained through voltage divider resistors R4, R5, and R7. Diode D1 temperature compensates the bias supply. Components L3, C13 and D2 permit phase modulation of the subcarrier information upon the RF output of transistor Q3. MULTIPLIER BOARD The modulator RF output is frequency multiplied in the multiplier board to obtain the various operating frequencies listed on the STL 10A specification sheet. The power level at the input to the multiplier is approximately 5 mw. The output level is 0.7 to 1.2 watts. RF POWER AMPLIFIER B AND B. The RF power amplifier consists of two boards; the PA Interface board ( B) and the Two Stage RF Power Amplifier board ( B). Up to 1 watt RF power from the Multiplier board ( ) at a frequency ranging from 445 to 480 MHz is fed into the 10/15C PA Interface board ( B). The purpose of this board is to double the incoming frequency, amplify the doubled frequency and filter out all other frequencies. This board also provides a means for controlling the RF power level via the front panel POWER ADJUST POT. An automatic level control (ALC) circuit stabilizes and maintains an accurate output power level. A 50 mw (max), MHz signal from this board is fed into the two stage RF Power Amplifier board. The RF goes through two stages of RF amplification. The first stage (U2) is a 1 watt (max) pre driver. It has an input and output transformer (T1 and T2) for achieving optimum 50 ohm matching between the stages. The output of T2 is fed into the final PA module (U3) for an output of 15 watts max. The signal is then low passed filtered through FL1 and then fed through a directional coupler for monitoring forward and reflected power. This board also provides regulated B+ for powering the PA and the rest of the chassis. Finally, there also exist circuitry for regulating the fan and monitoring PA current. DUAL LINK STEREO STL. Two STL 10A Links can share the same 500 KHz, 300 KHz, or 200 KHz channel for transmission of left and right stereo components, as shown in the STEREO STL SYSTEM BLOCK DIAGRAM, Drawing No A system operating in this manner uses no more spectrum (and possibly less) than COMPOSITE systems, while providing much lower channel cross talk (72 db). Since the two links are independent, if one link fails, continued operation in mono service is assured. Phase shift between channels can be less than 1 degree. The two carriers are offset above and below the channel center frequency as shown in the following FCC EMISSION PROFILE Drawings. Offsets are 125 KHz for 500 KHz channels, 75 KHz for 300 KHz channels, and 50 KHz for 200 KHz channels. Using a Marti HRC 10 Transmitter Combiner having 40 db isolation, all sidebands and IM products are well within the limits of Subpart E of FCC Rules Part Optional transmitter combiners are available which provide 70 db or 100 db of isolation. Receiver IF selectivity required in this system is 200 KHz for 500 KHz channels, 85 KHz for 300 KHz channels and 75 KHz for 200 KHz channels. 11

16 12 FIGURE 3. FCC EMISSION PROFILE (500 KHZ CHANNEL) DRAWING

17 13 FIGURE 4. FCC EMISSION PROFILE (200 KHZ CHANNEL) DRAWING

18 TEST EQUIPMENT. The following text presents the test equipment required for alignment of STL 10A Transmitters. A sample test report is also provided in the following text. 1. Bird, Model #43, Wattmeter, 50 ohm impedance. 2. Bird, 25 Watt Element, MHz. 3. Microwave Associates, 50 Watt RF Load, Model Kron Hite, Distortion Analyzer, Model 6900B. 5. Kron Hite, Oscillator, Model Hewlett Packard, Attenuator Set, Model 350D. 7. Signoteck Frequency Counter. 8. Hewlett Packard, Spectrum Analyzer, Model 8558B. 9. Wavetek, Automatic Modulation Meter, Model Wavetek, Digital Multimeter, Model 27XT. 12. Kay, RF Attenuator, Adjustable db, Model 437A. 13. Marconi, RF Signal Generator, Model 2022C. TOOLS FOR ALIGNMENT OF STL 10A SERIES TRANSMITTERS. 1. GC, 9300, Tuning Tool. 2. GC, 9440, Tuning Tool. 3. Spectrol, 8T000, Tuning Tool. 4. Sprague Goodman, Tuning Tool. TUNE UP PROCEDURE FOR STL 10A. MODULATOR CIRCUIT BOARD ADJUSTMENTS. Connect a dummy load with a sampling attenuator to the ANTENNA connector J6 of the transmitter. Connect an accurate standard FM deviation meter and frequency counter to the sampling attenuator or J5 the FREQUENCY TEST JACK. Operate the CONTROL switch to TRANSMIT. 1. Measure the bias voltage at TP (test point) of modulator circuit board using digital dc voltmeter. This voltage should be recorded on STL 10A TRANSMITTER TEST REPORT. To ensure low distortion modulation, do not change this voltage setting. 2. Operate the transmitter on frequency by adjusting L2 (fine) coil slug using correct insulated tool. If necessary, L1 (coarse adjustment) can be made using the insulated tool specified. 3. Monitor the PEAK MODULATION LED bar and feed a 400 Hz, +8 dbm signal from an audio signal generator into TB 1. The PEAK MODULATION meter should read 100%. If not, adjust R24 (modulation meter calibrate) on audio circuit board for 100% on PEAK MODULATION meter. The FM deviation meter should read the deviation specified under 100% modulation on STL 10A TRANSMITTER TEST REPORT. If not, adjust R6 on modulator circuit board Remove the 400 Hz tone. Feed the audio signal generator set for 67 KHz at one (1) volt into J1 Sub In. Operate the TEST METER switch to SUB LEVEL and adjust audio signal generator level for a meter reading of 0 VU. Adjust R11 for a 20% sub carrier injection as indicated on the linear vertical display on a spectrum analyzer. 14

19 STL 10A TRANSMITTER TEST REPORT CUSTOMER: ADDRESS: FREQUENCY: Serial #: Modulator Bias: 100% Modulation +khz. Total DC Current amperes TEST POINT READINGS TP 1 TP 2 TP V dc 0.60 V dc 0.70 V dc 1.90 V dc 0.50 V dc 1.00 V dc TP V dc 1.90 V dc TEST METER READINGS Subcarrier Level: 0 VU = 20% +13 Volt Supply: +1 VU = 13.5 Volts DC P.A. Current: 0 VU = Normal TEST EQUIPMENT Frequency Counter, HP Model 5383A Deviation Monitor, Wavetek Model 4101 SIGNATURE: DATE: 15

20 AUDIO CIRCUIT BOARD ADJUSTMENTS. 1. Connect an audio voltmeter to Pin 1 (modulator audio) of audio circuit board Connect a jumper between terminal 1 and 2 (the outer terminals) of TB 1 (the 600 ohm balanced input). Connect an audio signal generator between chassis and either Terminal 1 or 2. Operate the generator for a 100 Hz output at 1 volt. Increase sensitivity of the audio voltmeter until the 100 Hz output component is indicated. Adjust R9 (CMR, Common Mode Rejection) for a minimum common mode output. 2. Set S1 and S2 on audio circuit board for 75 micro second pre emphasis with S1 and S2 positioned toward R15. Remove the jumper and feed the audio signal generator into terminals 1 and 2 of TB 1. Operate the generator to 15 KHz and adjust the level for 0.78 volts (0 dbm) output on the audio voltmeter. Operate the generator to 400 Hz and observe audio voltmeter. The level at 400 Hz should be exactly 17 db below the level at 15 KHz. If not, return to 15 KHz and adjust R15 by the amount in error at 400 Hz. Repeat process until the exact pre emphasis is obtained. 3. Modulation meter calibration is covered in the modulator circuit board adjustments. MULTIPLIER CIRCUIT BOARD ADJUSTMENTS. Remove the top cover of the unit. Remove the coaxial cable plug at RF Output jack J2 of on multiplier circuit board Refer to the STL 10A ADJUSTMENT LOCATIONS diagram for the location of connectors, test points and adjustments. 1. Connect a Bird Model #43 Wattmeter with a 5 watt element and a 50 ohm load to J2 of multiplier circuit board Connect sensitive multimeter (0 3 volt DC range) negative probe to TP 1 of multiplier board and the positive probe to chassis ground. Operate the CONTROL switch to TRANSMIT. A minimum of 0.25 volts should be indicated. If not, refer to MODULATOR CIRCUIT BOARD ADJUSTMENTS in the preceding text. 2. Move the meter negative probe to TP 2. Adjust L1 and L2 for a maximum indication. 3. Move the meter negative probe to TP 3. Adjust L3 and L4 for a maximum indication. 4. Move the meter negative probe to TP 4. Adjust L5 and L6 for a maximum indication. NOTE: Omit this step on the MHz units. 5. Move the meter negative probe to TP 5. Adjust C27 and C28 for a maximum indication. Turn POWER ADJUST pot, R14 for maximum power. 6. Adjust C36 and C37 for a maximum indication on the wattmeter connected to J2 with the R14 power pot operated to maximum. Adjust power level to.75 to 2 watts output. 7. Operate the CONTROL switch to OFF. Remove the wattmeter from J2 and re install coaxial cable plug at J2. Adjust R14, POWER ADJUST, for correct transmitter output power. RF POWER AMPLIFIER BOARD B AND B ADJUSTMENTS. The RF Power Amplifier is very broad band and has been fully calibrated and adjusted at the factory. The only adjustments available are POWER CONTROL POT calibration, B+ adjust, FORWARD POWER METER adjust, REFLECTED POWER METER adjust, and PA CURRENT adjust. These adjustments should only be made as necessary and with extreme care by following the procedures below: For the following adjustments, switch TRANSMIT off and connect an accurate RF wattmeter and dummy load rated for at least 25 watts at 800 to 1000 MHz to the RF output N connector. Remove top cover of unit. Please carefully read procedures before doing them. POWER CONTROL POT CALIBRATION. 1. On the Interface board, rotate the POWER CALIBRATION POT (R4) fully counter clockwise. 2. On the front panel of unit, rotate the POWER CONTROL POT fully counter clockwise. 3. Rotate R20 on the two stage RF power amplifier board fully counter clockwise. 16

21 4. Turn on TRANSMIT switch. The wattmeter should read approximately 0 watts. 5. Rotate R20 on the RF power amplifier board approximately 6 turns clockwise. 6. On the front panel of unit, slowly rotate the POWER CONTROL POT clockwise watching the wattmeter for any significant power. Keep rotating the POWER CONTROL POT until the control is fully clockwise. If the output power exceeds 5 watts during the adjustment, proceed as follows: A. Rotate R20 on the RF power amplifier board clockwise until the output power is between 1 and 5 watts. B. Continue to rotate the POWER CONTROL POT until the control is fully clockwise. 7. With the POWER CONTROL POT in full clockwise position, begin slowly rotating the POWER CALIBRATION POT (R4 on 10/15C PA Interface Board) clockwise at the same time watching the wattmeter climb in power. Keep rotating the control until the desired maximum output power is obtained. Do not exceed 10 watts. 8. Once the POWER CONTROL POT is adjusted, do not re adjust POWER CALIBRATION POT R4 on the 10/15C PA Interface Board or R20 on the RF power amplifier board. 9. Replace top cover. B+ ADJUST. 1. Using a VOLTMETER, with negative lead connected to ground (chassis), connect the positive lead to a B+ location (refer to any schematic B+ wiring is red and goes to every PC board). 2. On the two stage RF Power Amplifier board adjust Pot (R5) in the direction required to achieve a B+ reading of 13 volts. Adjust this voltage with the TRANSMIT switch on and the output power at 10 watts. 3. Perform (or redo) the POWER CONTROL POT CALIBRATION procedure. 4. Replace top cover. FORWARD POWER METER ADJUST. 1. With the TRANSMIT switch on, adjust the POWER CONTROL POT (on front panel) such that the wattmeter reads 10 watts. 2. Put the front panel ROTARY switch in the forward power position. 3. Adjust R8 (on meter board just inside front panel) until the front panel meter reads 10 watts. 4. Verify calibration by adjusting POWER CONTROL POT and comparing the wattmeter reading with the front panel. They should closely agree as power changes. 5. Replace top cover. REFLECTED POWER METER ADJUST. 1. With the TRANSMIT switch on, adjust POWER CONTROL POT such that the wattmeter reads 10 watts. READ AND UNDERSTAND THE FOLLOWING STEPS BEFORE PERFORMING THEM. IT IS IMPORTANT THAT THESE STEPS BE PERFORMED WITHIN A SHORT PERIOD OF TIME. 2. Put the front panel ROTARY switch in the reflected power position. 3. With the TRANSMIT switch still on, remove the RF output cable from the N connector on the back of the unit. 4. Adjust R9 (on meter board just inside front panel) until the front panel meter reads 10 watts. 17

22 5. If R9 is turned as far as it can be turned and the front panel meter is still below the 10 watt reading, adjust R17 on the two stage RF Power Amplifier board until the front panel meter does indicate 10 watts. 6. Reconnect the RF output cable to the N connector. Verify that the power (from the wattmeter reading) goes back to 10 watts and the front panel reflected power meter reading falls to less than 1 watt. 7. Replace top cover. PA CURRENT ADJUST. 1. Turn on TRANSMIT switch. 2. Adjust output power to 10 watts using POWER CONTROL POT on front panel. 3. Put the front panel ROTARY switch in the PA CURRENT position. 4. Adjust R10 (on the meter board just inside front panel) so that the front panel meter indicates 100%. 5. Verify by adjusting output power up and down watching the PA CURRENT meter reading following the trend. 6. Replace top cover. FREQUENCY MEASUREMENT. The RF output frequency of this transmitter should be measured and adjusted as often as necessary to insure on frequency operation and to comply with regulations. Frequency measurement can be made by coupling off the RF output via a wattmeter or a 30 db (or more) 50 watt attenuator into a frequency counter. 18

23 19 FIGURE 5. STL 10A TRANSMITTER BLOCK DIAGRAM

24 20 FIGURE 6. STL 10A ADJUSTMENT LOCATIONS

25 FIGURE 7. STL 10A MAIN FRAME 21

26 STL 10A PARTS LIST PARTS LIST 950 MULTIPLIER Loc. Marti No. Description R Potentiometer, 100 ohm Mallory MR100P R C Resistor, 3.3 ohm 1/4 watt 5% carbon comp 30BJ250 R Resistor, 1k ohm 1/4 watt 1% metal film Mepco SFR55 1K 1%TR R Resistor, 1k ohm 1/4 watt 1% metal film Mepco SFR55 1K 1%TR R Resistor, 10k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 10k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 150 ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 15k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 15k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 2.7k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 2.7k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 330 ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 4.75K ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 47k ohm 1/4 watt 1% metal film Mepco SFR25 R Resistor, 560 ohm 1/4 watt 1% metal film Mepco SFR25 R C Resistor, 68 ohm 1/4 watt 5% carbon comp 30BJ250 R C Resistor, 68 ohm 1/4 watt 5% carbon comp 30BJ250 C Capacitor,.1 mf 100v 10% mylar OSG2A104K BULK C Capacitor,.1 mf 100v 10% mylar OSG2A104K BULK C Capacitor,.1 mf 100v 10% mylar OSG2A104K BULK C Capacitor,.01 mf 50v GMV disc Pace F7Z5U1C103Z TR C Capacitor,.01 mf 50v GMV disc Pace F7Z5U1C103Z TR C Capacitor,.01 mf 50v GMV disc Pace F7Z5U1C103Z TR C Capacitor, variable pf T3 5 EFJ C Capacitor, variable pf T3 5 EFJ C Capacitor, variable pf T3 5 EFJ C Capacitor, variable 1,7 11 pf t6 5 EFJ C Capacitor, uncased mica 12pF 5% FWM602 C Capacitor, uncased mica 12pF 5% FWM602 C Capacitor, uncased mica 47pF 5% FWM602 C Capacitor, 470 pf 50v 10% Y5P disc Pace F6Y5P1C471K JT C Capacitor, 1 pf 5% type QC C Capacitor, 1 pf 5% type QC C Capacitor, 2 pf 5% type QC 22

27 C12B Capacitor, 3 pf 5% NPO disc Pace F5NPO1C3ROC TR C Capacitor, 11 pf 5% NPO disc RMC CC110BJIAA25 C Capacitor, 14 pf 5% NPO disc RMC CC140BJIAA25 C Capacitor, 22 pf 5% NPO disc Pace F5NP01C220J JT C12A Capacitor, 27 pf 5% NPO disc Pace F5NP01C270J TR C Capacitor, 27 pf 5% NPO disc Pace F5NP01C270J TR C C Capacitor, 39pF 5% 200V ceramic dipped C322C390J2G5CA C C Capacitor, 39pF 5% 200V ceramic dipped C322C390J2G5CA C C Capacitor, 47pF 5% 200V ceramic dipped C317C470J2G5CA C Capacitor, 75 pf 5% NPO disc Pace F6NP01C750J JT (BULK) C Capacitor, 150 pf 5% NPO disc Pace F6NP01C151J JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.02 mf 50v Z5U disc Z5 223M XICON C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor, tantalum, 2.2 mf 25v ECS F1EE225K Panasonic L Inductor, 1 1/2 turn brown Coilcraft J12S L Inductor, 1 1/2 turn brown Coilcraft J12S L Inductor, 2 1/2 turn red Coilcraft J12S L Inductor, 2 1/2 turn red Coilcraft J12S L Inductor, 6 1/2 turn blue Coilcraft J12S L Inductor, 6 1/2 turn blue Coilcraft J12S L Inductor, 1 1/2 turn 14 AWG Buss Wire (CCW) L Inductor, 1 1/2 turn 14 AWG Buss Wire (CW) L Inductor, 1 1/2 turn 14 AWG Buss Wire (CW) L Inductor, 1 1/2 turn 14 AWG Buss Wire (CW) L Inductor, 10 turn.15 uh #90 03 D Diode, Germanium BKC 1N270 D Diode, Germanium BKC 1N270 D Diode, General Instruments 1N4007 Q Transistor, Motorola MRF629 Q Transistor, Motorola 2N4427 or SGS 2N4427 Q Transistor, Motorola 2N

28 Q Transistor, Motorola 2N2857 Q Transistor, Motorola 2N2857 L Ferrite Bead, # /4B Q Heatsink, Thermalloy 2260R red J Connector, phono jack Molex J Connector, phono jack Molex P Connector, 4 dual pin header (cut from ) PCB B PC Board, Multiplier RPT 2/15/30 STL 10 REV 9544 PARTS LIST STL POWER SUPPLY Item Marti No. Description 10 PER Eyelet, GS3 12 GM C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C Capacitor,electrolytic 15000uF 25V 159LBA025M2CG C Cap, Monolithic chip 10000pF 10% XR7 Kemet C1206C103J5RACTR C07 NOT USED C08 NOT USED C09 NOT USED C10 NOT USED C10B Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C11 NOT USED C11B Capacitor,.001 mf 50v disc 20+80% Pace F5Z5U1C102Z JT C12 NOT USED C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR D Diode, Motorola 1N5402 D Diode, Motorola 1N5402 D Diode, Motorola 1N5402 D Diode, Motorola 1N5402 D Diode, General Instruments 1N4007 D Diode, General Instruments 1N4007 D Diode, Motorola 1N5402 L Inductor, Fair Rite # STE25C0236 0BW 24

29 L2 NOT USED L3 NOT USED L4 NOT USED L5 NOT USED L6 NOT USED P Connector, 8 pin Molex header (cut from ) PCB B PC Board, Power Supply RPT 15 STL 10 REV 9514 R Resistor,2K 1% 1/4W Metal Film R Potentiometer, 500 ohm cermet Bourns 3309P 501 PARTS LIST STL INPUT FILTER BOARD Loc. Marti No. Description 2 PER Screw, 4 40 x 1/4 phillips pan head M/S Nickel Plated 2 PER Screw, 4 40 x 7/16 phillips pan head MS zinc plated C01 NOT USED C02 NOT USED C03 NOT USED C04 NOT USED C05 NOT USED C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Cap, monolithic chip, 22 pf 50v 5% KEMET C1206C220J5GACTR C Cap, monolithic chip, 22 pf 50v 5% KEMET C1206C220J5GACTR C Cap, monolithic chip, 22 pf 50v 5% KEMET C1206C220J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR C Capacitor,monolithic chip,1000pf 50v 5%KemetC1206C102J5GACTR J Connector, D Sub 15 pin angle Keltron DNR 15PJL SG JP Open Top Two Circuit Shunt Molex JP Open Top Two Circuit Shunt Molex JP Connector, 5 dual pin header (cut from ) JP Connector, 1 dual pin header (cut from ) L01 NOT USED L02 NOT USED L03 NOT USED 25