USER'S GUIDE
INSTALLATION
PK232UG Rev. B 9/86
2-16
34
4. If your SSB radio has a "monitor" facility, i.e., an audio output that lets you listen to
the audio signals entering the microphone or phone patch jacks, turn that monitor
circuit on.
5. Set the radio's MODE selector to LSB (lower sideband).
6. Set the radio's meter switch to the "ALC" position. If the radio doesn't have an "ALC"
indication, set the meter switch to "Ip" to read plate current. If a plate current read-
ing isn't available, set the meter to indicate power output.
NOTE:
In the calibrate mode only, the
K
key toggles the transmitter PTT line on
and off. The
SPACE BAR
toggles the PK-232's AFSK tone generator from
"Mark" (the lower pitched tone) to "SPACE" (the higher pitched tone). The
PK-232 has a transmit watch dog timer circuit that unkeys your transmitter
automatically after 60 (sixty) seconds. As you perform the following adjust-
ments, unkey periodically, then rekey the transmitter by typing
K
.
7. Enter the Calibrate mode by typing
CAL <RETURN>
.
8. Press the
K
key on the keyboard to key the transmitter. You should hear a continuous
tone in the radio's monitor output.
9. Tap the space bar several times until you hear the lower pitched of the two tones
("mark").
10. Press
K
again to unkey the transmitter.
11. With the PK-232 keying the transmitter and transmitting the lower of the two tones,
adjust the transmit audio level as follows:
o
Rotate the microphone gain control clockwise to about one-quarter open.
o
Turn the PK-232's rear-panel AFSK Output Level adjustment screw clockwise
(CW) until the ALC meter shows a small deflection from the unmodulated
reading. Check the radio's plate current or output power indicators.
EXAMPLE:
If the manufacturer's plate current specification for CW operation is
200 mA, set the AFSK Output Level control and your microphone gain
control so that the plate current indicates approximately 75 mA.
12. Type
K
to return to receive mode.
13. 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 mi-
crophone gain control to an approximate correct level for all operating modes.
NOTE:
For CW, 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 opera-
tion is generally acceptable.
