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