AEA PAKRATT PK-232, Technical Reference Manual

Page: 38 / 101

PK-232 TECHNICAL MANUAL CHAPTER 6 – ADJUSTMENTS AND TESTS
PK232TM Rev. A 5/87 6-3 Page 38
6.2.2. Demodulator (Receive) Adjustment
1. Connect the oscilloscope to U30 pin 14.
2. Adjust R81 for maximum signal amplitude.
3. Press the [SPACE BAR]. The on-screen frequency counter should read 2310 Hz.
4. Connect the oscilloscope to U30 pin 1.
5. Adjust R96 for maximum signal amplitude.
6. Type Q to exit the calibration routine.
6.3. Functional Test
1. Type MY AEA [RETURN].
The monitor should display
MYCALL was AAA
.
2. Type C AEA [RETURN].
The monitor should display
*** CONNECTED TO AEA
.
3. Type a few characters and press [RETURN]. These same characters should be
echoed back to the terminal.
4. Type ^C < CTRL-C >.
The monitor should display
CMD:
.
5. Type K [RETURN] to enter CONVERSE mode.
6. Adjust the PK-232's THRESHOLD control clockwise until the DCD LED on the
PK-232's front panel is lit. Type several characters and a [RETURN]. Observe the
SEND LED on the front panel. The SEND LED should NOT be lit.
7. Adjust the THRESHOLD control counterclockwise until the DCD LED is extinguished.
Observe that the
SEND LED
is lit and that the characters that were typed are
echoed on the screen.
8. Adjust R155 (AFSK output level) to 200 millivolts peak-to-peak as measured at the
junction of C59 and R160.
9. Type ^C .
10. Type VHF OFF [RETURN].
The monitor should echo
VHF was ON
.
11. Type HB 300 [RETURN].
The monitor should echo
HBAUD was 1200
.
12. Type K [RETURN].
13. Type several characters followed by a [RETURN].