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EXAMPLE: If the manufacturer's plate/collector current<br />
specification for CW operation is 200 mA, set<br />
the AFSK Output Level control and your<br />
microphone gain control so that the<br />
plate/collector current indicates<br />
approximately 75 mA.<br />
If you have not connected and calibrated an FM transceiver to the<br />
<strong>PK</strong>-<strong>232</strong> and do not plan on doing so, then complete the following:<br />
I. Rotate the microphone gain control clockwise (CW)<br />
approximately in the one-quarter ON position.<br />
II. Turn the <strong>PK</strong>-<strong>232</strong>'s rear-panel AFSK Output Level<br />
adjustment screw clockwise (CW) until until the ALC<br />
meter shows a small deflection from the unmodulated<br />
reading. Check the radio's plate/collector current or<br />
output power indicators.<br />
III. Adjust the AFSK Output Level control until the radio's<br />
indicators show approximately thirty percent (30%) of<br />
the manufacturer's rated full-power reading.<br />
EXAMPLE: If the manufacturer's plate/collector current<br />
specification for CW operation is 200 mA, set<br />
the AFSK Output Level control and your<br />
microphone gain control so that the<br />
plate/collector current indicates<br />
approximately 75 mA.<br />
13. Type "K" to return to receive mode.<br />
14. Type "Q" to "Quit" (exit) the calibration routine.<br />
You have now set the <strong>PK</strong>-<strong>232</strong>'s transmit audio output level and<br />
your SSB radio's microphone gain control to an approximately<br />
correct level for all operating modes.<br />
NOTE:<br />
For Mode A (ARQ) AMTOR and packet radio operation, the<br />
radio's microphone gain control can be adjusted to produce<br />
the full-power output plate current recommended by the radio<br />
manufacturer. These modes are "bursty" modes; the<br />
transmitter is keyed on and off automatically by the <strong>PK</strong>-<strong>232</strong>.<br />
The resulting duty cycle is much less than 100% and fullpower<br />
operation is generally acceptable.<br />
15. With your radio in receive mode, tune the receiver to a clear,<br />
unoccupied frequency.<br />
16. Set the receiver's audio volume control (AF GAIN) to the position<br />
you would normally use for CW reception. This is the approximate<br />
receiver audio output level for best receive performance from<br />
your <strong>PK</strong>-<strong>232</strong>'s modem.<br />
17. Turn the <strong>PK</strong>-<strong>232</strong>'s front-panel THRESHOLD control clockwise until<br />
the DCD LED is lit by the noise output from your receiver, then<br />
slowly counterclockwise until the DCD LED is no longer lit.<br />
4/91 3-12<br />
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