QRPGuys Pacificon KD1JV, Руководство пользователя

Страница: 9 / 19

Page 9 of 19 pacificon_assy_041621.pdf
Transmitter testing:
 The bias current for the linear PA needs to be set.
 You might as well connect up a power meter and dummy load now.
 Connect an ampmeter in series with your power supply. The 200 ma.
setting should be fine.
 Turn V1 fully counter clockwise.
 In DSB mode, key the transmitter and note the current.
 Adjust V1 until the current increases by 40-50 ma.
 If you don't have an ampmeter, set V1 to about the 2 O'clock position.
 If the current does not increase, you have a problem with the solder
connections on T2.
 Set the mode switch to the CW position.
 Key the transmitter and note the power output.
▪
40M – ~5 watts.
 Switch back to DSB mode and check to see that you modulate when
speaking into the microphone by seeing power output on your meter.
 Your DSB PEP power will be about ½ the CW power due to the power being
split between the two side bands. Average power will be much less.
Calibration:
Now that everything is working, do the frequency calibration. Until this is done,
the actual frequency maybe (and most likely) off from the dial by up to 500 Hz.
There are two ways the LO can be calibrated.
1. Use a frequency counter. The LO signal is available at the test point labeled
“LO” on the top side of the board.
2. Zero beat a SWBC station. These are easy enough to find in the evening
and are on exact 5 kHz clicks.
Entering Calibration Mode:
 A 5 second push of the Encoder actives Calibration mode
 Release the Encoder when [CAL ] is displayed.
 The VFO reference oscillator can now be tuned with the encoder to calibrate
the frequency.
 This can be done in one of two ways.
1. Use a frequency counter at the LO test point.
◦
Tune to match the frequency which was on the display when CAL was
entered. To help you remember what frequency that is, the frequency
◦
will re-appear on the display, but leading with “C” to indicate you are
in CAL mode.