QRPKits KD1JV, Instruction Manual

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Power up and test:
1. Wire up the power plug, center pin plus. Connect to power supply, plug into power jack on rig.
2. Turn power on via volume control.
3. Test for 5 volts between pins 8 and 3 of U1 or U2 (tests analog 5V reg, U5) and between pins 14 and 7 of U4
(tests digital 5V reg, U10).
4. Remove power from rig.
5. Insert ATMEGA-48 chip into U6 socket. Just in case you put the socket in backwards, verify chip direction with
parts layout diagram.
6. Insert LM386 chip into U8 socket
7. Plug a paddle into the paddle jack.
8. Plug speaker or headphones into headphone jack
9. Apply power to rig and turn on.
10. The display should now come on and read [bA8.0]
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You must now program the processor so it knows which frequency (in meters) you have selected for band A, B
and C. bA80 shown on the display indicates band A is currently set to 80 meters.
1. Change the band setting by tapping the DOT paddle. This will advance the setting from 80 to 60, 60 to 40 and so
on. The display will change accordingly and a beep will sound. [bA8.0], [bA6.0] and so on. After 17 meters, the
selection will roll over back to 80 meters. This is done in case you go past the band you wanted, as there is no
“decrement” switch.
2. Once the proper band setting is selected, advance to the next band to be set by clicking the keyer switch located
under the display. The next higher frequency band will automatically be selected and displayed.
3. Select the band setting for the B band
4. Click keyer switch to advance to C band.
5. Select the band C band
6. Click the keyer switch to finish. The rig will reset to it's normal operation.
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If a mistake is made or at some point you what to change the filters on one of the band positions to operate on a
different band, the band select mode can be enabled by holding closed the DASH paddle and the KEYER switch
while turning power to the rig on.
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The keyer will now be operational and you can send some Morse.
Receiver testing and BFO adjustment:
1. Disconnect power from rig
2. Insert SA162A chips into U1 and U2 sockets
3. Insert LM358 into U3 socket.
4. Insert LM386 into U8 socket.
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Hold closed the DOT paddle and KEYER switch while turning power to the rig on.
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The rig will now be in a calibration mode and the display will show [CAL.r]
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If an accurate frequency counter is available, the DDS reference frequency can now be calibrated. Since the
typical frequency error is usually 50 Hz or less, the calibration can be skipped by going to step 4 if a suitable
frequency counter is not available.
1. DDS frequency can be picked off of Pin 7 on U1 or at the U9, Pin 20/C60 junction.
2. The DDS frequency is calibrated to exactly 10.000,000 MHz
3. Use the Dot and Dash paddles to tune the DDS frequency up or down as required to set the frequency to
10.000,000 MHz.
4. Finish by clicking the KEYER switch. This will advance to the offset/BFO adjust mode. The display will now
show [CAL.o]
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If an Oscilloscope is available (it can be audio PC based 'Scope) the IF offset frequency can be set in addition to
the BFO frequency. If a 'Scope is not available, the BFO trimmer will have to be set by ear. (skip to step 6)
1. Connect the 'Scope to pin 7 of U3 (output of 1 st audio stage).
2. Preset BFO trimmer (CT7) about ¼ turn.
3. Using the paddle, tune LO frequency up and down, noting the point at which the signal amplitude starts
to drop off.
4. Tune the LO frequency be more or less centered in the pass band of the IF filter.
5. Move the 'Scope to pin 1 of U3 (or top of volume control)
6. Adjust BFO trimmer to peak signal in pass band of Audio Filter. If a 'Scope is not available, peak by ear,
keeping volume control turned down so that AGC is not engaged.
7. Once adjustments are finished, click the KEYER switch again to store these values and rest the rig.
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