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2. Zero beat an AM SWBC station. To use a broadcast station, you need to first
tune it in, knowing they are on exact 5 kHz frequencies. Since you are
slightly off frequency, the audio will be wobbly. Active the Calibration mode
and tune the VFO until the wobble in the audio goes away. A scope will help
with this and get you closer then you can just by ear. You may not get the
frequencies to exactly match, but you can get pretty close.
Packaging the board:
A custom PCB enclosure is available from QRPGuys. Simple, light and with labeled
controls, it is a good option. If you don't mind doing some metal work, the board
will fit into a 110mm X 88 mm X 38 mm extruded aluminum box, which is
commonly available on ebay. A drill template is located at the end of the manual.
Operation:
The power up sequence is:
The display will do a segment test by lighting all segments. [8.8.8.8.8.]
The band for which the board operates on is displayed [ bnXX]
The default operating frequency is displayed and the rig is ready to operate.
The default tuning rate is 1 kHz.
Display:
The display reads out the operating frequency to 10 Hz. The MHz digits are not
shown and are implied by the band. Below 01.000.00, the leading zero is
suppressed.
When tuned outside the Ham Band, the display will automatically shift to
indicate the MHz digits and the transmitter disabled.
This reduces the display resolution to 1 kHz.
◦
The current tuning rate does not change.
◦
10 and 100 Hz tuning rates are available, but the display will not
◦
increment until the 1 kHz digit rolls over.
The transmitter is disabled when tuned outside the Ham band. The side
◦
tone will beep if you try to transmit.
General coverage tuning is from 500 kHz to 30 MHz. Tuning outside the
◦
Ham band will reduce sensitivity. Sensitivity will decrease the most when
tuning above the band due to the transmitter's Low Pass Filter. The
Receiver front end is only loosely tuned to the band so shows greater
sensitivity when tuned below the band.
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pacificon_assy_041621.pdf
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