Color QRP HF SDR kit mchf made big secre

Color QRP HF SDR kit mchf made big secre A machine that is made by a lover. January 2016 1

First:overview This software radio (SDR) short wave (HF) small power (QRP) transceiver, since the launch of a popular all over the world, so far, has at least more than 30 thousand users. The advantage is that it is small and portable, the price is suitable, but the function is complete, is a direct mining software radio models. For love DIY enthusiasts, this is a very good practiced hand suite; software radio programming enthusiasts for love can also be the hardware of arbitrary software upgrade. And QRP enthusiasts can use packed suite all outdoor QRP communication, especially with the psk31 and RTTY digital modem, is a small, portable emergency communication equipment. The main features of the mchf suite are described below: 1, 2.8 inch display screen, has received spectrum tall on the display and waterfall map display. 2, independent, compact two PCB design, control part of the UI board and RF part of the RF board independently. 2

Top is UI PCB,Down is RF PCB 3, the work mode is complete, USB, LSB, AM and CW, FM. 4, up to 48KHz bandwidth of the spectrum display. 5, the use of fast, all electronic switch control to send and receive to switch, do data communication has a special advantage. 6, two USB interface (one big one small), used for software programming and PC control, external keyboard and so on. 7, the local oscillator / clock temperature compensation, more conducive to work in digital mode. 8, built-in digital signal processing filter (DSP), carefully adjusted, you can get a better reception. 9, built-in automatic key circuit, support A, B model. 10, there are 4 encoders, 17 buttons, easy to operate. Note: (the kit does not contain the shell, after appropriate opportunity to launch the shell, please note) 3

Two:the main design indicators Frequency range: Reception: 2.5-30MHz Launch: all HF HAM band Working mode: full mode Minimum frequency step: 1Hz Antenna impedance: 50 ohm Operating temperature range: -10--+60 degrees Celsius Frequency stability: Positive and negative 1.5PPM@ boot 5 minutes standard. If TCXO can achieve positive and negative 0.5PPM. Operating voltage: 9 - DC 15V Operating current: Reception: less than 450 Ma; off after about 60 ma. (improvement can be as little as 5 ma) Launch: 3A maximum (FULL power file), 1.5A (5W file) Machine size: 190 * 70 * 40 mm (length * width * height). Transmitter parameters: Band: all the working range of HAM short wave amateur segment Transmit power: nominal 5W (13.8VDC), 15W (FULL, 13.8V) Modulation: SSB software balance modulation, 10KHz FM AM software low level modulation. 4

Spurious suppression: greater than 40DBC Carrier suppression: greater than 45DBC Alternative: 2.3KHz SSB (-6db) 500Hz CW (-6db) If frequency: 0 Receiving sensitivity: -100dBm Dynamic range: better than 95dB RIT frequency fine tuning range: positive and negative 1KHz Audio output: 8 ohm, 0.5W. Three, suite notes 1, the kit contains the host, power lines, hand microphone each. Antenna output port for BNC bus. Hand microphone for 3.5MM stereo plug, power line for alligator clip joint. 5

MIC DC cable 6

Crocodile clip 2, this machine covers band 3.5, 5, 7, 10, 14, 18, 21, 24, 28MHz, as the original design of only four bands of the transmit low pass filter, so the harmonic band only four bands. 3, short press the power of the machine to open the key can adjust the LCD backlight brightness, but will lead to the increase of the noise inside the machine, in the 100% brightness without the interference noise. 4, the machine SWR detection is only for reference, not completely accurate. Can refer to the aircraft to adjust the document to be more accurate. 5, if you do not change the hardware, after the power supply, even if it does not boot, the whole machine will have 70-80 Ma static power consumption, from the drive level bias circuit. 6, when the antenna is not connected, the software will automatically increase the receiving gain, which will cause the ADC noise to be amplified and decoded. Therefore, there will be a relatively large receiver noise. Then the antenna is basically normal. 7, the power supply interface is positive and negative, can be 7

used for the voltage range of DC9-15V, the current capacity must be greater than 3.5A. 8, kit (no shell) basic size: 190 * 70 * 40 mm (long * wide * high) (no prominent) 9, the interface of English prompt explanation: (1) AFG audio gain (2) RFG RF gain (3) CMP voice compression (4) MIC microphone gain (5) RIT receive fine tuning (6) DSP receiving audio processing filter 10, the right side of the machine IN, OUT Jack: (1) OUT is the audio output of the demodulator, not the IQ output. (2) IN is the signal input at the launch, in the menu you can switch the microphone or line input. 11, USB Mini interface for the brush machine, big mouth USB no use, or after the USB keyboard to do digital mode communication. 12, ACC port is connected with the external power amplifier. Have the machine PTT output and the key control input, the specific joint definition to see the package attached to the interface definition document. 13, if there is a radio interference, you can open the menu, select LO LOW RX to try. At this point the LIF function is turned on, but the spectrum display will be offset by about 6K. 14, the machine's TCXO function is to use the SI570 next to the 8

temperature sensor for open loop frequency correction, the use of noise will be generated. Can be closed or opened in the menu. 15, power calibration and adjustment in the hidden extension of the menu. If you want to open the FM mode, you must turn on if the. See accompanying statement. 16, in order to improve the power output of the 10 meter band, the original design of the power tube RD16HHF1 to RD15HVF1 is more suitable. In addition in order to improve the ability to drive the relay, multi parallel a 74LS145 integration IC. 17, spectrum display color, waterfall chart shows the color can be modified in the menu. 18, so far for this suite of software for the 219.26-4, from 291.26-5 after you can support the touch screen function, you must change the hardware connection. So the software version of the package brush are 219.26-4. Four, kit welding debugging 9

Welding of (a) RF board 1, plus welding power supply socket J1, a number of points of solder, to prevent repeated insertion damage, this is because the solder paste reflow solder paste, see the following figure. 2, welding U5. Is also because reflow solder paste solder paste is not enough, but also contribute to the heat. 3, welding T1 (receiving), T4 (emission), T5 (emission), the three RF patch transformer is related to the key parameters of the whole machine, must use the original CX2074NL, can not be 10

replaced by domestic models. Welding on P2 antenna socket (note the two fixing feet must be welded, or repeatedly in dial the antenna to has gnarled), DS1, anti electrostatic ne bubble. 11

T1 (receiving), T4 (emission), T5 (emission) CX2074NL transformer 12

Antenna socket P2 and DS1 4, welding socket J2, J3. 13

TWO jack Jack is ok 5, welding on D3, D4 (MA4P7102F, switching diode). 14

Repair welding R31, R32, R33, R34. Stack U14. 15

Repair welding of four jumpers (see below, R33, R34 and U14 3.4 feet and eleventh feet on the ground is connected to U19, RFC6 and RFC5 connection). 16

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6, according to the kit attached documentation coiled coil, coil joint processing, followed by welding RFC8, T6, T7, T2 and T3 (power standing wave detection) and low pass portion of L13 to the L24 a total of 12 magnetic ring coil. And hot melt adhesive or paraffin fixed. 18

LPF L13toL24 T6andT7 RFC8 19

swr 20

T2 and t3 21

7, U3, U4, Q5, Q6 need to be fixed to the heat sink and then welding. 30 pin row seat welding should pay attention to the neatly. U3,U4,Q5,Q6 22

heat sink J2, J3 interface description see figure below: J2 J3 The following picture is the welding of the complete RF board. back 23

top (two) welding of control panel 1, welding with socket J1, J2, J3, J10 (big USB), welding J11 (USB Mini). Repair welding R35A, R45, R46, repair welding patch voltage regulator tube U6. 24

2, welding screen, four encoder, 30 pin pin. And two light 25

emitting diodes (LD1 is rx,ld2 is TX ) The light emitting diode and a needle Four encoders TFT LCD 3, welding J4. According to the attached document with a suite of a disconnected PCB board, then welding socket, and the two 26

pin socket on the short circuit. J4 jack 4, from the C86 and R40 short after a line, such as drawing, (in order to brush BOOT with), brush finish removal. (in fact, this is a short P6, in order not to affect the installation of two PCB fixed, P6 and P8 is not welded) 27

5, P7 for the built-in speaker connector. If the use of external headphones or speakers do not have welding. The following figure for the welding completed UI board. TOP 28

BOTTOM (three) UI board and RF board assembly The following components will be used to combine the two plates into a whole: Fixing assembly for mounting 29

1, combination of four such components, and fitted to the RF board of the four fixed holes, fixed with a small nut. 2, and then four washers on the pad 3, copper screw column lock. As graph: 30

4, button on the UI board, and with four small screws can be locked. (four) brush firmware. This machine uses a powerful STM32F407 CPU, you can use the PC machine through the USB interface for the firmware to burn 31

and write to the XP operating system, for example, the specific steps are as follows: 1, the installation of Bootloader Install the Dfuse tool (stsw-stm32080.zip, after decompression run the installation process, the installation can be successful). (1), connect the USB Mini cable to the computer (2), the control board P6 jumper shorted (in just assembling and welding has been from the C86 and R40 short connect a line, quite to be P6 a short jumper) (3), long press BAND+ button (4), connected to the power supply, press the POWER key (5), the release of the BAND+ key, continue to hold down the POWER key (the whole process should be pressed down) (6) after about 3 seconds, the computer will find new hardware, and automatically install DFU USB driver (7), run just install the Demonstration DfuSe tool, confirm to be able to detect the chip, and then press the "Choose..." button, select the latest bootloader file. (8), click on the "Upgrade" button, to upgrade, during the POWER key to continue to hold, until the upgrade success prompted (9), turn off the power, P6 will remove the short jumper (C86 32

and R40 shorted line). 2, brush firmware (1), turn off the power supply, confirm that the USB Mini line is connected to the computer. (2), hold down the BAND- key, and then press the POWER key, enter the bootloader mode, both LED at the same time light. (3), about 2 seconds or so, the computer prompts to install a new driver. (see attached document for WIN7 drive installation. If the driver installation is not successful, it is recommended to replace the old computer, the operating system is recommended to be XP. Always click on the next step until the driver is installed successfully. (4), run Manager mchf, click "Detect", if you can detect information, explain the success of the drive installation. (5), click "...", select the latest version of the firmware file (*.bin) (6), click on "Update", to upgrade. (7), after the success of the upgrade, the radio will automatically restart. 33

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Four, debugging and calibration Overall welding assembled, connected to the appropriate DC current and is connected with a power meter, a dummy load, 35

microphone in hand, a tapper, which can start debugging: 1, not on the power supply, that is about 70 Ma of current is normal (see above). Press the power button to boot, test the various buttons and the encoder can be used normally. (receiving state of the whole machine current is about 0.45A) 2, the band switching point in 4.2-4.3MHz, 8.0, 8.1MHz, 16.0 - about 16.1mhz can continuous rotary encoder to adjust the frequency, hear the sound of a relay switch, in order to determine low pass band switching is normal. 3, connected to an external antenna, receiving signal of each band, from spectrum can see signal spectrum (recommended choice of radio signals, such as can receive the receiving circuit is normal). 36

1, open the hidden menu, enter power calibration mode, with external power meter or comprehensive measuring instrument, transmitting and calibration of each band power (parameter values a maximum of 85 in 5W power and full full power stall, if current parameter can be adjusted, the font is white). 37

20m full pwr adjust Standing wave power detection circuit debugging reference 2, calibration frequency. The condition of the use of a 38

comprehensive test instrument calibration, if there is no instrument, you can receive standard frequency of the radio station to calibrate. Specific details refer to the attached Chinese manual documentation. 3, this suite has other extremely powerful features, please see the package with Chinese documentation, and read carefully, there are conditions to print a book on the hand to facilitate easy to read. So far, the adjustment is completed, can enjoy the QRP color SDR machine the fun. Five, each interface definition 39

RF board ACC control interface J3 40

MIC j3 on UI board 41

KEYER for RF board J2 42

Exp phone J4 43

UI board line out J1 44

UI board line in J2 45

Six, supplementary instructions: 1, low pass ring can also according to such production parameters 46

1, all kinds of machine appearance 47

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UI o.3 pcb 50

Can be the SI570 of the heat for improvement 51

There are enthusiasts to touch the function, and can work to the 6M and 2 meter band 52

Touch screen access method (need to upgrade software to support) 53

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