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USER'S GUIDE
10. Type
Q
You've now set your FM transmitter's deviation to an approximate level which will be
adequate for initial operation.
11. With your radio in the receive mode, open the squelch control so that a steady hiss
or noise is heard in the speaker.
12. Set the PK-232's THRESHOLD control to the "12-o'clock" position.
13. Set the receiver's volume control so the DCD LED on your PK-232 just lights with the
receiver unsquelched.
This is the approximate proper level for best receive performance from your PK-232's
modem.
14. Reset your transceiver's squelch control for normal operation.
2.7.2
SSB Installation and Adjustment
Installation and adjustment of your PK-232 with SSB radios is usually simpler and more di-
rect than with the FM equipment. You'll use the same kind of cables and connectors that
you use with your FM gear.
Digital modes with SSB radio require some different settings of the radio's operating con-
trols for proper AMTOR and packet operation. Be sure to observe the following precau-
tions:
o
Set VOX to OFF.
o
Set speech compression to OFF.
o
Set AGC to FAST (if available).
o
Disconnect the ALC cables between your SSB radio and any external RF amplifier
you wish to use in AMTOR or Packet-Radio service.
Remember – Baudot, ASCII RTTY and Node B (FEC) AMTOR are continuous key-down
conditions – your radio's duty cycle is 100 % for the duration of each transmission. If
your SSB radio isn't designed for continuous full-power operation, you must operate
your radio at reduced output power. Consult the manufacturer's specifications for de-
tails on the operating duty cycle.
NOTE:
1. Connect your PK-232 and SSB radio as shown in Figure 2-2.
2. Turn on your PK-232 and your computer and start your terminal program.
3. Connect your SSB radio to a dummy load.
PK232UG Rev. B 9/86
to "Quit" (exit) the calibration routine.
Make all connections with all power off. If your SSB radio has a phone patch
input and external PTT connections, the PK-232's AFSK output can be con-
nected to those input jacks, leaving the microphone jack for normal service.
However, some microphones are connected at all times – regardless of the
PTT line's state. In this case, remove the microphone from the input to pre-
vent inadvertent loading of the audio input circuit. If the phone patch jack
has a series isolating resistor, your microphone can remain connected.
2-15
INSTALLATION
33
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