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Color QRP HF SDR kit mcHF made big secre

A machine that is made by a lover.

January 2016

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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.

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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)

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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.

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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.

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MIC

DC cable

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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

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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

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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

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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

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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.

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

transformer

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Antenna socket P2 and

DS1

4, welding socket J2, J3.

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TWO jack

Jack is ok

5, welding on D3, D4 (MA4P7102F, switching diode).

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Repair welding R31, R32, R33, R34.

Stack U14.

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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).

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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.

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LPF L13toL24

T6andT7

RFC8

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swr

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T2 and t3

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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

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heat sink

J2, J3 interface description see figure below:

J2 J3

The following picture is the welding of the complete RF

board.

back

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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.

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

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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

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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)

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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

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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

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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:

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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

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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

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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.

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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,

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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).

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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).

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20m full pwr adjust

Standing wave power detection circuit debugging reference

2, calibration frequency. The condition of the use of a

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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

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RF board ACC control interface J3

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MIC j3 on UI board

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KEYER for RF board J2

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Exp phone J4

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UI board line out J1

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UI board line in J2

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Six, supplementary instructions:

1, low pass ring can also according to such production

parameters

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1, all kinds of machine appearance

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UI o.3 pcb

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Can be the SI570 of the heat forimprovement

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There are enthusiasts to touch the function, and can work to the 6M and 2 meterband

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Touch screen access method (need to upgrade software tosupport)

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