1 Sherwood Engineering Transceiver Performance What s new in the last year? Rob Sherwood NCØB Lots of options for your dollars.
2 What is important in a contest environment? Good Dynamic Range to hear weak signals in the presence of near-by strong signals. You need a better receiver for CW than for SSB. Be a good neighbor: i.e. Have a clean signal. Transmitters continue to be a mixed bag.
3 What Parameter is Most Important for a CW Contester? Close-in Dynamic Range (DR3) (We have to know the noise floor to calculate Dynamic Range)
4 What is Noise Floor? Sensitivity is a familiar number, normally applies to SSB. Sensitivity = 10 db Signal + Noise / Noise (10 db S+N/N) Noise Floor = 3 db Signal + Noise / Noise (3 db S+N/N) Noise floor can be measured at any filter bandwidth, CW or SSB, for example, and is bandwidth dependent. League normally only publishes noise floor for a CW bandwidth, typically 500 Hz CW filter.
5 Noise Floor Rarely an Issue on HF On 20 meters and below, atmospheric, galactic and man-made noise predominates. On 15 meters, in a quiet rural location, the receiver is still rarely the limit. Example: NC0B, 5 element yagi at 70 feet, 270 feet of 7/8 th inch hardline, antenna pointed in the quietest direction (30 degrees) at 4 PM on 2/28/2010. Receiver sensitivity, no preamp, 2.4 khz = 0.5 uv Receiver sensitivity, w/ preamp, 2.4 khz = 0.2 uv Receiver noise floor, w/ preamp, 500 Hz = -135 dbm
6 LJ-155CA yagi in the previous example
7 A simple test with only a analog meter Most hams don t own a calibrated signal generator. How do you evaluate your receiver? Measure the noise gain when you connect your antenna. All you need is an analog meter with a db scale, hooked up to your speaker.
8 Measure the noise gain Disconnect your antenna and set the volume so your db meter reads -10 db. (Put a dummy load on the rig, but it will likely make no difference.) Connect the antenna and see how many db the noise goes up when tuned to a dead spot on the band. Do this with Preamp OFF and ON
9 What did I measure on 15 meters? With preamp OFF, noise gain = 3.0 db With preamp ON, noise gain = 8.3 db (This was in the quietest direction!) With the preamp ON, now rotate your yagi 360 degrees and note the difference in noise. In the direction there is skip, the noise will be higher. Can be a 10 db difference in band noise vs. direction.
10 15 & 10 meters not that different Rig = IC-756 Pro III 10 meter antenna = Hy-gain 65 feet 15 meter antenna = Hy-gain 70 feet Preamp 15 M 10 M None 4 db 3 db Preamp db 9.5 db Preamp db 11.0 db
11 More Variables Plan ahead if you can At my QTH there are two towers near the house and four 200 to 350 feet away. My noise level on meters is vastly worse for the close-in towers, unless I turn off electronic devices. TVs (CRT or plasma), UPS & family-room computer, broadband router (makes birdies), wireless Internet dish, wall warts with switching power supplies, hand touch lamp!
12 Tower Distance vs. local RFI (noise)
13 Numbers with Preamp-1 ON Noise Floor Quite Consistent in Top 10 FTdx-5000D -135 dbm Elecraft K3-138 dbm Perseus -125 dbm (No preamp) Flex dbm Orion II -133 dbm Orion I -135 dbm T-T Eagle -132 dbm Flex dbm TS-590S -137 dbm Icom R dbm Drake R-4C -138 dbm (For comparison)
14 What is Dynamic Range? The range in db of very strong signals to very weak signals that the receiver can handle At The Same Time What is Close-in Dynamic Range vs Wide-Spaced Dynamic Range? Why is Close-in Dynamic so important for CW ops? Why is it less important for SSB operators?
15 Third Order IMD to Measure Dynamic Range Signal Signal 2 khz spacing IMD IMD 2 khz spacing 2 khz spacing
16 Wide & Close Dynamic Range 20 khz Spacing 2 khz Spacing IMD 20 khz Away IMD 2 khz Away 15 khz Wide 15 khz Wide First IF Filter at MHz First IF Filter at MHz
17 Highest performance with a bandwidth appropriate filter right up front after the first mixer. Mixer SSB BW Filter Amplifier Mixer DSP Filtering CW BW Filter This keeps the undesired strong signals from progressing down stream to the next stages.
18 What has changed in last 8 years? Ten-Tec started the change in 2003 with the Orion, the first radio to drop up-conversion and go back to a low first IF. Elecraft followed, and now Yaesu and Kenwood in Only Icom has of yet not offered a downconversion radio If the TS-590S is a big seller, will Kenwood follow on with a larger and more expensive model?
19 When are 2 Out of Pass Band Signals a Problem? If you know the close-in dynamic range of a radio, at what signal level will IMD start to be a problem? S Meter standard is S9 = 50 V, which is 73 dbm Assume a typical radio: 500 Hz CW filter Noise Floor of -128 dbm Preamp OFF Dynamic Range Signal Level Causing IMD = Noise Floor 55 db S9 FT-757 (56 db) 60 db S9 + 5 db FT-2000 (61 db) 65 db S db IC-7000 (63 db) 70 db Typical Up-conversion S db 1000 MP / Mk V Field (68 / 69 db) 75 db S db 756 Pro II / III (75 db) 80 db S db Omni-VII / IC-7800 (80 db) 85 db S db TS-590S (88 db) 90 db S db Eagle & Flex 3K (90 db) 95 db S db Orion II & Flex 5000A (95 db) 100 db S db FTdx-5000, K3 (200 Hz roofing)
20 Close-in 2-kHz 500 Hz BW Dynamic Range of Top 8 Transceivers FTdx-5000D 101 db Flex db (Flex users raise hand) Elecraft K3 95 db (with 500 Hz filter) Orion II 95 db Orion I 93 db TT Eagle 90 db Flex db TS-590S 88 db (Low Freq 1 st IF mode) TS-590S 76 db (30, 17, 12, 10 & 6 M)
21 How did the new rigs perform on CW? I used the FTdx-5000, TS-590S and Eagle in the 160 m. ARRL, Stew Perry & CQ contests. Switched between the Kenwood and the Ten- Tec during the CQ contest. Overload was never an issue. All could crank down the DSP filter to 100 Hz or narrower. Ran most of the contest at 200 Hz BW Definitely needed 50 to 100 Hz BW
22 Narrow DSP Filters Come Through In all three contests working CE1/K7CA required the narrowest bandwidths to copy through the pile-up, since he was not working split. Thank goodness the DXpeditions work split, so you can hear when the DX comes back to you. You can imagine what it is like at the DX location: total pandemonium for days!
23 The DR3 window is not fixed The dynamic range of a radio is the same with an attenuator ON or OFF. If on a noisy band, attenuate the noise and all signals to make better use of the dynamic range, and reduce the chance of overload. If band noise goes from S6 to S2 by turning on the attenuator, you have lost nothing, yet your radio is being stressed much less.
24 Let s now look at the transmitters I am now testing transmitters with white noise feeding the microphone, in addition to a twotone test. The effect of IMD products (splatter) are more obvious with noise. Think of it as a 1000 tone test, more approximating real voice.
25 White Noise Mk V Class A vs. K3 Class 75 Watts -60 db 6 khz -60 db 1.5 khz Courtesy W6XX
26 What shipped since Dayton 2010? Yaesu FTdx-5000D Kenwood TS-590S Ten-Tec Eagle
27 Ten-Tec Eagle Class B White Noise 60 db down 7 khz away
28 Kenwood 590S Class B White Noise 60 db down 5 khz away
29 7600 about 10 db worse than the Pro III IC-7600 on top, 756 Pro III on bottom 8 db Offset 18 db difference at 6 khz
30 FTdx-5000D Class A Two Levels ALC ALC Half Scale No ALC 60 db down 2 khz away
31 What s wrong with the FTdx-5000D? Decades ago Collins clearly stated that an ALC circuit should have a SLOW time constant (decay). ALC should just be a slow leveling circuit. Speech processing should be done way before the PA and the ALC. This issue can be fixed, either in hardware or in firmware, but I don t know which it is.
32 Ham breaks into my 20 meter QSO When some breaks in to comment on your signal, what is your first thought? I must be splattering With the 5000D in Class A, and NO ALC, the ham broke in to say I had the cleanest signal he had ever seen on the air with his K3 and his P3 bandscope.
33 What Could Contests Be Like? What would CQ WW or ARRL DX be like if everyone had a signal this clean? Yet some hams don t want a clean signal. They want elbow room. This goes back to Contest Ethics from this morning!
34 Back to CW signals We have seen how width of an SSB signal & its IMD products affects how close you can operate to another station. How does CW compare? How close can we work to a strong adjacent CW signal?
35 What is the Bandwidth of CW Signal? On channel signal = S db (-33 dbm) Receiver = K3, 400 Hz 8-pole roofing Hz DSP Filter Transmitter = Omni-VII with adjustable rise time Undesired signal 700 Hz away, continuous dits at 30 wpm Rise time of Omni-VII Strength of CW sidebands Signal S dbm Ref 3 msec S7-83 dbm -50 db 4 msec S6-88 dbm 5 msec S6-88 dbm 6 msec S5-93 dbm 22 db! 7 msec S4-99 dbm 8 msec S4-99 dbm 9 msec S4-99 dbm 10 msec S3-105 dbm -72 db
36 Spectrum of CW Signal on HP 3585A Analyzer Rise Time 10 msec, dits at 30 WPM, Bandwidth -70 db = +/- 450 Hz = 900 Hz
37 Spectrum of CW Signal on HP 3585A Analyzer Rise Time 3 msec, dits at 30 WPM, Bandwidth -70 db = +/- 750 Hz = 1500 Hz
38 Spectrum of CW Signal on HP 3585A Analyzer Comparison of 3 msec vs 10 msec rise time 20 db difference
39 Leading edge of dit 3 & 10 msec
40 Just the Facts On SSB you want DR3 = 70 db, or more. On CW you want DR3 = 80 db, or more. This is most economically accomplished with low IF (5 to 9 MHz) selectable crystal roofing filters. It is much more difficult to deliver 80 db or higher DR3 with the more common Up-Conversion design. Transmitted bandwidth of the interfering signal is often the limit, not the receiver.
41 What dynamic range is possible and needed for CW? 80 db or 2 khz with a 500 Hz bandwidth Ten-Tec Omni-VI+: 80 db 2003 Icom IC-7800: 80 db 2003 Ten-Tec Orion I: 93 db 2005 Ten-Tec Orion II: 95 db 2007 Flex 5000A: 96 db 2007 Ten-Tec Omni-VII: 80 db 2008 Elecraft K3: 95 db 2010 Kenwood TS-590S: 88 db 2010 Ten-Tec Eagle: 90 db 2010 FTdx-5000: 101 db
42 Other radios for comparison, 2 khz dynamic range data Elecraft K2: 80 db Collins R-390A: 79 db Kenwood TS-850S: 77 db Icom Pro II / Pro III 75 db Collins 75S-3B/C: 72 db Kenwood TS-870S: 69 db Yaesu FT-2000: 63 db This is shockingly bad Icom IC-7000: 63 db Yaesu FT-One: 63 db Yaesu FT-101E: 59 db Drake R-4C Stock: 58 db Yaesu FT-757: 56 db Yaesu VR-5000: 49 db Worst radio I have ever tested!
43 Bogus ARRL Dynamic Range Numbers Many modern transceivers are phase noise limited, particularly close-in at 2 khz. The League wanted be able to measure the IMD buried in the phase noise, and came up with a new method a few years ago using a spectrum analyzer with a 3-Hz filter.
44 IC-7600 with 3-Hz Spectrum Analyzer Reference tone -130 dbm -130 dbm Phase noise limited dynamic range is 78 db at 2 khz. 500 Hz DSP Filter Passband Measured with a 3-Hz filter on the analyzer, the dynamic range is 87 db at 2 khz!
45 What the New ARRL DR3 Method Means Old method, IMD or noise increased 3 db. IMD tone at noise floor = This was DR3, either IMD or noise limited. With the new method, noise increased 10 db, and by ear you hear nothing but noise. How is this the same? Unless you work a contest using a 3-Hz CW filter, the new League dynamic range measurements are meaningless. If the radio is phase noise limited.
46 IC-7800 ARRL Old vs. New Method 4/18/2006 IC-7800 test data, old method 2 khz, Phase Noise 80 db 1 khz, Phase Noise 67 db 2/6/2007 IC-7800 test data, new method 2 khz, dynamic range = 86 db No measurement reported at 1 khz.
47 Flex 3000 Old Method vs. 3 Hz Filter Flex 3000 with Old Method: DR3 = 90 and is completely phase noise limited. Flex 3000 with 3 Hz Spectrum Analyzer method measures a dynamic range between 95 and 99 db, depending on the spacing. The Orion II and the K3 perform better, but now you cannot tell that by the QST numbers.
48 Phase noise should not be ignored! The problem is the League is now measuring dynamic range in such a way to eliminate phase noise from the equation. Phase noise (reciprocal mixing in a QST review) gets but a single line of data. An Elecraft K3 at 99 db is not the same as a Flex 3000 at 99 db, yet you would never know that from a QST review.
49 Question: How good is good enough? High Dynamic Range Receiver (DR3). Minimum 70 db for SSB & 80 db for CW If the real DR3 > 90 db, your receiver is fine. Differences of a few db are NOT significant. Sensitivity 15 meters and below, preamp ON: 0.2 uv Noise floor 15 meters and below, preamp ON: -135 dbm Receiver testing needs to approximate the real world.
Roofing Filters, Transmitted IMD and Receiver Performance Rob Sherwood NCØB What s important when it comes to choosing a radio? Sherwood Engineering Why Did I Start Testing Radios? Purchased a new Drake
Test Report: Yaesu FTDX-1200, S/N 3F02051 (loaned by Bill Trippett W7VP) Adam M. Farson VA7OJ/AB4OJ, 19-21 July 2013 1. Introduction and Scope: The following tests were conducted on the FTDX-1200: A. Receiver
ELECRAFT KX3 EXTENDED VFO TEMPERATURE COMPENSATION PROCEDURE Copyright 2012 Elecraft LLC Rev. A8, October 27, 2012 Introduction The KX3 standard VFO temperature compensation is entirely adequate for most
This obsolete manual file is provided as a courtesy to you by Ten-Tec, Inc. Ten-Tec's service department can repair and service virtually everything we have built going back to our first transceivers in
MAINTENANCE & ADJUSTMENT Circuit Theory The concept of PLL system frequency synthesization is not of recent development, however, it has not been a long age since the digital theory has been couplet with
Introduction to Receivers Purpose: translate RF signals to baseband Shift frequency Amplify Filter Demodulate Why is this a challenge? Interference (selectivity, images and distortion) Large dynamic range
Analysis of the DF0MTL 144 MHz Signal Dr. Pit Schmidt, DK3WE Stefan Hübner, DL9GRE Günter Schmidt, DL2LSM Jens Schmidt, DH0LS October 15, 2009 Abstract Noise measurements as well as a spectral analysis
Michael Hightower, KF6SJ 13620 White Rock Station Rd, Poway, CA 92064; firstname.lastname@example.org Simple SDR Receiver Looking for some hardware to learn about SDR? This project may be just what you need to explore
@'pproved for release by NSA on 12-01-2011, Transparency Case# 6385~SSIFIED Receiver Dynamics STATUTORILY EXEMPT Editor's Note: This paper was written before the author retired (1995), In K4 we use a number
Network Analyzer Operation 2004 ITTC Summer Lecture Series John Paden Purposes of a Network Analyzer Network analyzers are not about computer networks! Purposes of a Network Analyzer Measures S-parameters
RCForb Server Setup Overview The RcForb Server allows you to setup your own remote station on Remote Hams. Three connections to your transceiver are required, and an Internet connection. The first required
New Product Release Information Oct 2014 TS-590SG HF/ 50MHz All-Mode TRANSCEIVER_ Kenwood introduces Updated to new G version new HF/50MHz All-Mode Transceiver Four years ago we launched our best-selling
The Phase Modulator In NBFM Voice Communication Systems Virgil Leenerts 8 March 5 The phase modulator has been a point of discussion as to why it is used and not a frequency modulator in what are called
High performance RX antenna for a small lot Jose Carlos N4IS TX antenna interaction Common mode noise TX/RX leaking Polarization filter HWF Twisted pair lines HWF single loaded loop construction HWF dual
Home Maximizing Receiver Dynamic Range for Spectrum Monitoring Brian Avenell, National Instruments Corp., Austin, TX October 15, 2012 As consumers continue to demand more data wirelessly through mobile
COMM.ENG INTRODUCTION TO COMMUNICATION SYSTEMS AND TRANSMISSION MEDIA 9/6/2014 LECTURES 1 Objectives To give a background on Communication system components and channels (media) A distinction between analogue
AN-23 DTV Rptr.doc (6/1/2015) p. 1 of 5 Application Note AN-23 June, 2015 DVB-T Television Repeater Jim Andrews, KH6HTV Fig. 1 A 70cm, Digital TV Repeater, block diagram. The FCC allows licensed amateur
Study of RF Spectrum Emissions in High Pressure Sodium and Metal Halide Lamps Lawrence P. Glaister VE7IT, Automation Engineer May 2010 Abstract: This research was performed in collaboration with the City
1 of 7 An Adjustable Audio Filter System for the Receiver - Part 1 The audio response is shaped as required using Switched Capacitor Filters Lloyd Butler VK5BR Front panel view of the original receiver
High Speed Multi Media Mesh Networking Using Commercial Off the Shelf Equipment John Clements WB5SAL Corpus Christi Digital Radio? Original - CW Packet 600 baud, can saturate network Other Digital modes,
Jeff Thomas Tom Holmes Terri Hightower Learn RF Spectrum Analysis Basics Agenda Overview: Spectrum analysis and its measurements Theory of Operation: Spectrum analyzer hardware Frequency Specifications
Optimizing IP3 and ACPR Measurements Table of Contents 1. Overview... 2 2. Theory of Intermodulation Distortion... 2 3. Optimizing IP3 Measurements... 4 4. Theory of Adjacent Channel Power Ratio... 9 5.
200 WOOD AVENUE, MIDDLESEX, NJ 08846 PHONE (732) 469-9510 FAX (732) 469-0418 MATRIX TECHNICAL NOTES MTN-107 TEST SETUP FOR THE MEASUREMENT OF X-MOD, CTB, AND CSO USING A MEAN SQUARE CIRCUIT AS A DETECTOR
January 2009 HF/50MHz TRANSCEIVER i7600 Icom proudly announces debut of the HF/50MHz transceiver IC-7600. Since the first release in 1996, four generations of the IC-756 series have earned a formidable
Location 3 of 6: National Science Foundation Building Roof April 16, 2004 Revision 2 Published August 15, 2005 Mark A. McHenry Shyam Chunduri Shared Spectrum Company 1595 Spring Hill Road, Suite 110 Vienna,
SDR and Contesting The Future is Now By Pete Smith, N4ZR Additional contributions by: N6TV, VE3NEA, I2PHD, and WA6KBL Contest Forum Dayton Hamvention, May 2008 Outline What is SDR all about? SDR demo What
HP 8970B Option 020 Service Manual Supplement Service Manual Supplement HP 8970B Option 020 HP Part no. 08970-90115 Edition 1 May 1998 UNIX is a registered trademark of AT&T in the USA and other countries.
The basic set up for your K2 to run PSK31 By Glenn Maclean WA7SPY I am by no means an expert on PSK31. This article is intended to help someone get on PSK31 with a K2. These are the things I did to get
IMPROVING MOBILE INTERNET SPEEDS Introduction The purpose of this guide is to educate consumers on ways to improve their mobile internet speeds and offer an insight into how the mobile networks operate
Cutting the Cable (or Dish) with Antenna TV By Tom McMorris (mcmorrisphoto.com) In today s world it seems that the cost of everything keeps climbing and climbing including the price of cable or satellite
RF Communication System EE 172 Systems Group Presentation RF System Outline Transmitter Components Receiver Components Noise Figure Link Budget Test Equipment System Success Design Remedy Transmitter Components
Whitepaper 4 Level FSK/FDMA 6.25 khz Technology DISCLAIMER This document has been prepared by the dpmr MoU Association as a reference document about dpmr. The information in this document has been carefully
INTRODUCTION The Decimator ProRackG guitar noise reduction system defines a new standard for excellence in real time noise reduction performance. The Decimator ProRackG was designed to provide the maximum
Remote Operation Note: I recently installed an ICOM IC-7200 with a single USB cable interface to HRD/DM780 184.108.40.2067 so I'm no longer using the older remote operation setup described below. However, I'll
KACHINA DRAKE T4XB COLLINS S, S COLLINS KWMA AUDIO OUT CABLE WIRING COLLINS V, V, KWS Hallicrafters E.F. Johnson DRAKE TR7 + Mic - Mic 8 Pin Mic Connector Pin 8 Pin Mic Connector Pin 8 Pin Mic Connector
This obsolete manual file is provided as a courtesy to you by Ten-Tec, Inc. Ten-Tec's service department can repair and service virtually everything we have built going back to our first transceivers in
Network Analyzer Fundamentals and Two Tone Linearity Name: Name: Name: Objective: To become familiar with the basic operation of a network analyzer To use the network analyzer to characterize the in-band
Product Review and Short Takes from QST Magazine June 2009 Product Reviews: ICOM IC-7200 HF and 6 meter transceiver Micro-Node International IRLP/EchoLink Node Short Takes: KU4AB Model SQ-50 6-Meter Antenna
HUMAN EXPOSURE TO EMR: ASSESSMENT OF AMATEUR RADIO STATIONS FOR COMPLIANCE WITH ACA REQUIREMENTS May 2005 Version 2.0 PO Box 78 BELCONNEN ACT 2616 Telephone (02) 6219 5555 Facsimile (02) 6219 5353 www.aca.gov.au
Application Note Spectrum and Power Measurements Using the E6474A Wireless Network Optimization Platform By: Richard Komar Introduction With the rapid development of wireless technologies, it has become
MEASUREMENT UNCERTAINTY IN VECTOR NETWORK ANALYZER W. Li, J. Vandewege Department of Information Technology (INTEC) University of Gent, St.Pietersnieuwstaat 41, B-9000, Gent, Belgium Abstract: Precision
Department of Electrical and Computer Engineering Ben-Gurion University of the Negev LAB 1 - Introduction to USRP - 1-1 Introduction In this lab you will use software reconfigurable RF hardware from National
Ultra Wide-band Coverage SDR Receiver MK3 Full coverage reception form 100KHz to 2GHz SDR Independent antenna inputs for Shortwave and VHF USB computer connection ( micro-usb) Very High dynamic range receiver
i7100 HF/VHF/UHF Transceiver QST Product Review QST Magazine is owned and published by the American Radio Relay League (ARRL). Icom America expresses its gratitude to the ARRL for the permission to reprint
ST-1 Satellite Tracking Program for Partner Schools of What is a Satellite Tracking Program? A NEW opportunity for Quest Partner Schools start a Satellite Tracking Program with three parts: 1. An after-school
Lynx Broadband Installation Manual for Residential Packages with a 20 db Amp Quick Start Guide (first two pages) 1. Be sure that your kit includes all the parts shown in the Check the Equipment section
AM / FM Tuner + RDS Model: TU-101 www.pulse-audio.co.uk 1 Safety Information The lightning bolt within a triangle is intended to alert the user to the presence of dangerous voltage levels within the product
Signal Booster Installation Guide In-Building Wireless Smart Technology Signal Booster Contents: Antenna Options and Accessories................... 1 Before Getting Started / How It Works...............
Products: Spectrum Analyzer FSP Measurement of Adjacent Channel Leakage Power on 3GPP W-CDMA Signals with the FSP This application note explains the concept of Adjacent Channel Leakage Ratio (ACLR) measurement
Thump User Guide Thank you for choosing the Thump Bluetooth Wireless Headphones. Please read this guide carefully to ensure your ease in using your Thump features fully. Reproduction, transfer, distribution
Doppler Doppler Chapter 19 A moving train with a trumpet player holding the same tone for a very long time travels from your left to your right. The tone changes relative the motion of you (receiver) and
Jacques Audet, VE2AZX 7525 Madrid St, Brossard, QC, Canada J4Y G3: email@example.com A Low Frequency Adapter for your Vector Network Analyzer (VNA) This compact and versatile unit extends low frequency
Welcome to the United States Patent and TradeMark Office an Agency of the United States Department of Commerce United States Patent 5,159,703 Lowery October 27, 1992 Silent subliminal presentation system
Optimizing VCO PLL Evaluations & PLL Synthesizer Designs Today s mobile communications systems demand higher communication quality, higher data rates, higher operation, and more channels per unit bandwidth.
Implementing Digital Wireless Systems And an FCC update Spectrum Repacking Here We Go Again: The FCC is reallocating 600 MHz Frequencies for Wireless Mics 30-45 MHz (8-m HF) 174-250 MHz (VHF) 450-960 MHz
DT3: RF On/Off Remote Control Technology Rodney Singleton Joe Larsen Luis Garcia Rafael Ocampo Mike Moulton Eric Hatch Agenda Radio Frequency Overview Frequency Selection Signals Methods Modulation Methods
Introduction N4PY Client-Server Remote Operation There are two ways to do remote operation of a radio using N4PY software. The way that has been done previously is to use any remote desktop program such
TV hearing aid BL-8008A BL-8008B Manual A. Product instruction 1. What is TV hearing aid 2. Theory 3. Features 4. Functions 4.1 TV hearing aid function 4.2 Normal hearing aid function 4.3 Wired hearing
Lab Notes Prepared by the ARRL Laboratory Staff (e-mail: firstname.lastname@example.org) ELECTRONIC TROUBLESHOOTING By Ed Hare, KA1CV, ARRL Laboratory Supervisor Q: Someone just gave me a collection of used amateur equipment,
COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS JD746A RF Analyzer Introduction The RF Analyzer JD746A is an ideal tool for installation and maintenance of cellular base stations. The JD746A combines the functionality
Sterling Park Amateur Radio Club 3 November 2010 By Tom Nail WA2BCK Licensed in 1965 as WN2UNX Licensed in 1967 as WA2BCK Amateur Extra class 18 February 1972 Founder Buffalo Area DX Club 1969 Operated
THE ANTENNA ROOM by Kent Britain, WA5VJB A Cheap And EZ HDTV Antenna Project Here s an inexpensive way of helping along that new Digital TV converter you just got with the government HD converter coupon
ACRS 2.0 User Manual 1 FCC Regulatory Information This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference,
RF Network Analyzer Basics A tutorial, information and overview about the basics of the RF Network Analyzer. What is a Network Analyzer and how to use them, to include the Scalar Network Analyzer (SNA),
DSA800 Series Spectrum Analyzer Configuration Guide This guide is used to help users to configure DSA800 series spectrum analyzer according to their requirements. You can get an overall understanding of
Regional Emergency Communications John Walters W8CX Alpena RACES Regional Communications Needs 400 mile radius No skip zone; no dead spots No interference with or from broadcasters Reliable day/night coverage
GSM/EDGE Output RF Spectrum on the V93000 Joe Kelly and Max Seminario, Verigy Introduction A key transmitter measurement for GSM and EDGE is the Output RF Spectrum, or ORFS. The basis of this measurement
PMSDR (you don t need the switchboard plug- in!) FT1000mp Soundcard for the PMSDR (I use the EMU 0202 USB) WinradHD ( now called HDSDR) Omnirig Cat software (A COM component for transceiver/receiver CAT
Ham Radio Deluxe Revision History Ham Radio Deluxe Version 6.2.10 (aka "migration release") This release is referred to as "the migration release" because it moves the HRD user files into the Windows user
Zero to 100 in 18 Months Getting Started in DXing How I Did It By Craig Bradley, AE6RR Page 1 of 46 Background History After 37 years off the air I was re-licensed in Sept. 2004 WV6SVW & WA6SVW 1961 to
General Survey of Radio Frequency Bands 30 MHz to 3 GHz Version 2.0 September 23, 2010 Prepared by: Shared Spectrum Company 1595 Spring Hill Road Suite 110 Vienna, VA 22182-2228 703-761-2818 Fax: 703-761-2817
DX 88HL Full Channel AM/FM/SSB Mobile Built in Frequency Counter AM/FM 10W SSB 25W with Roger Beep Printed In Malaysia AT2100013P PD000929 OWNER S MANUAL TABLE OF CONTENTS Page Specification...................................
Your consent to our cookies if you continue to use this website.