Specifications

III. Adjust the AFSK Output Level control until the radio's
indicators show approximately thirty percent (35%) 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 75 mA.
IV. Your radio may be able to operate at higher output
levels. Consult your radio manual.
NOTE: If you find the "correct" AFSK level setting occurs in the
first 20% of the potentiometers range, the adjustment may
be difficult. If you find this adjustment difficult, see
the NOTE in step 9 of the FM adjustment section on page 3-9
of this manual. Repeat step 12 when this has been competed.
13. Type "K" to return to receive mode.
14. Type "Q" to "Quit" (exit) the calibration routine.
You have now set the PK-900's transmit audio output level and
your SSB radio's microphone gain control to an approximately
correct level for all operating modes.
NOTE: For packet radio operation, the radio's microphone gain
control can be adjusted to produce the full output power
recommended by the radio manufacturer. Packet is a "bursty"
mode and the transmitter is keyed on and off automatically
by the PK-900. 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-900's modem.
3.6 Oscilloscope Connections
Some operators prefer to use an oscilloscope for tuning. Radio
port 1 provides mark and space outputs for driving the vertical and
horizontal inputs of an oscilloscope as shown below.
Figure 3-8 PK-900 Oscilloscope Connections
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