Table of Contents
Advertisement
PK-232 TECHNICAL MANUAL
6.2.1.
AFSK Generator (Transmit) Adjustments
While in calibration routine use:
o
[SPACE BAR] to toggle between mark and space;
o
[H] to toggle between VHF (1200/2200 Hz) and HF (2110/2310 Hz);
o
[K] to toggle Push-to-talk (PTT) and key the transmitter;
o
[Q] to exit the calibration program.
1.
Connect a wire jumper or loopback shorting plug between pins 1 and 2 on the PK-
232's
RADIO 1
2.
Type
MY AAA
play:
3.
Type
CAL
4.
Adjust R167 for a reading of 1200 ± 10 Hz as display on the screen or frequency
counter. Use the [SPACE BAR] to toggle between mark and space. If adjusting R167
has no effect, press the [SPACE BAR].
5.
Press the [SPACE BAR].
6.
Adjust R165 for reading 2200 ± 10 Hz. as displayed on the screen or frequency
counter.
7.
Press the [H] key to change to narrow-shift operation.
8.
Adjust R164 for a reading of 2310 ± 5 Hz. If adjusting R164 has no effect, press the
[SPACE BAR] once and try again.
9.
Press the [SPACE BAR].
10.
Adjust R168 for a reading of 2110 ± 5 Hz.
11.
Connect an oscilloscope to the junction of R160 and C59.
12.
Adjust R157 for minimum signal. This is the AFSK null adjustment.
PK232TM Rev. A 5/87
(J4) receptacle.
followed by a [RETURN] (or [ENTER] key). The monitor should dis-
MYCALL
was PK232
MYCALL
now AAA
followed by the [RETURN] key.
CHAPTER 6 – ADJUSTMENTS AND TESTS
6-2
Page 37
Advertisement
Table of Contents
Troubleshooting
