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Keying Logic
7.3.3 Receiver Module Tests
DIP switch (SW1)
Pos. 1 Closed Pos. 5 Open
Pos. 2 Open Pos. 6 Open
Pos. 3 Open Pos. 7 Closed
Pos. 4 Open Pos. 8 Open
Received Signal Path
1. Set the Signal Generator to 250kHz at a level
of 1.0Vrms (with TC-10B power on).
2. Measure the signal level between “RCVR”
and “RCVR COM” on the RF Interface
module to be 0.90 to 1.1V.
3. Measure the input signal level at the RF
Interface module pins A/C 28 to GND to be
between 170mV and 230mV as read by the
analyzer 1 Meg input.
4. Set the Signal Generator to 250kHz at a level
of 112 mVrms (with TC-10B power on).
5. Push the SET button. The frequency display
will begin flashing. Using the raise or lower
button, set the frequence to 250kHz. Push the
SET button again to accept this value.
6. Check that the display reads “Set Sens?...”.
Push the SET button to set the sensitivity.
Check that the display reads “Sens Adjust?
Hit Raise/Lower or Set when done...”. Push
the SET button to set. Check that the display
reads “Set EXT CLI?”. If necessary use the
Raise or Lower button to adjust, otherwise
push the SET button once more.
With an audio input level of 112mV, the CLI
should read 0dB.
Voice Audio Output
1. Leave the Signal Generator channel A set at
250kHz and set channel B to 1.0kHz. Set
%AM (percent modulation) to 50% (SHIFT
key +AMPTD key). Set the modulation on the
signal generator to channel A=INT. AM.
2. On the Receiver module, set SW1-2 ON. Put
the extender card into the Voice Adapter slot
and turn it on.
3. Measure Audio IN at pins A/C 26 to GND
A/C 32 on the ext. card to be 1.7-2.0V p-p.
Page 7–4 October 2003
TC–10B System Manual
Technologies, Inc.
Low- High-
Level Level
Start Start Stop Output
(1) ON 1W
(2) ON ON NONE
(3) ON 10W
(4) ON ON NONE
Table 7–4. Keying Logic.
NOTE
You can key low-level by placing the appropriate
voltage (15V, 48V, 125V, or 250V) across TB4, pins 5
and 6, on the rear panel. You can key high-level start
by placing the voltage across TB4, pins 1 and 2. You
can key carrier stop by placing the voltage across
TB4, pins 3 and 4.
NOTE
Measure this level with an RF Voltmeter, don’t rely
completely on the display.
NOTE
Do not use coaxial cable for this
measurement.
NOTE
Measure this level with an RF Voltmeter, don’t rely
completely on the display.