PK-232 MBX Operating Manual - N3UJJ

7.2.6 Tuning in AMTOR Stations
Tuning in AMTOR stations properly is critical to successful operation.
Since HF AMTOR stations use either 170 Hz or 200 Hz Frequency Shift
Keying to send data, tuning accuracy is very important. Follow the
procedure below for the best results.
o
o
o
Make certain your HF receiver is either in LSB or FSK depending
on your PK-232 set-up.
Turn any IF-Shift and Passband-Tuning controls to the Center or
OFF position.
Tune your receiver carefully between 14.065 and 14.085 MHz (or
another band where you know there is AMTOR activity) and listen
for the "chirp chirp" of ARQ or the steady data of FEC stations.
NOTE:
When in the AMTOR Standby mode as you are now, you will not
be able to print the "chirping" ARQ signals. To print these
stations, you must be in the AMTOR Listen (ALIST) mode.
o
When you find a station, slowly vary VFO on your receiver and
look for a display on the PK-232 tuning indicator as shown below.
Tuned In
If the tuning indicator looks like the one below, the frequency
from your speaker is too low for the PK-232 to copy the signal.
Slowly tune the VFO and make the frequency higher.
Frequency
Too Low
If the tuning indicator looks like the one below, the frequency
from your speaker is too high for the PK-232 to copy the signal.
Slowly tune the VFO and make the frequency lower.
Frequency
Too High
o
Adjust the PK-232's THRESHOLD control so that the DCD LED lights
when a properly tuned FEC AMTOR station is being received.
After you have an FEC AMTOR station tuned in, you should start seeing
the copy on your screen. If you have tuned in "chirping" ARQ AMTOR
stations, you will not print anything until you enter the ALIST mode.
If you just want to receive, see Chapter 10 on SIGNAL IDENTIFICATION.
4/91 7-3
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