Timewave DSP-232, Operating Manual

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Chapter 3 Radio Installation
Figure 3-6 Radio-to-DSP Radio Port 2 Connection for 9600 bps packet
3. Turn on your radio and computer. Load your terminal program so that you’re operating the DSP in the
Dumb Terminal mode.
4. Enter
the
CALIBRATE
mode by entering:
CAL
next to the cmd: prompt.
In
the CALIBRATE mode only , the letter K toggles the transmitter PTT line on and off; the ( SPACE ) bar
toggles the tone generator from Mark (the lower pitched tone) to Space (the higher pitched tone).
Note : The DSP has a transmit watchdog timer circuit that unkeys your transmitter automatically
after 30 seconds.
5. Press
K to key the transmitter. You should hear a continuous tone in the spare receiver.
6. Tap the (
SPACE ) bar several times until the higher pitched of the two tones (Space) is heard.
7. Adjust the transmit audio level as follows:
a) Set the monitor receiver to your transmitter’s frequency and turn up the volume. Turn the DSP’s rear-
panel AFSK LEVEL pot clockwise until you hear no increase in the audio output level from the
monitoring receiver.
b) Rotate the AFSK LEVEL pot counter-clockwise (CCW) until the audio signal on the monitoring
receiver is slightly, but noticeably, reduced.
Note : If you find the “correct” AFSK level setting occurs in the first 20% of the potentiometers range,
the adjustment may be difficult. If you find this adjustment difficult, the internal AFSK
adjustment level jumper may be moved to the LOW setting which will improve the adjustment
range of the potentiometer.
To locate the internal AFSK level jumpers in the DSP-232, remove the six screws that secure the
top chassis, and carefully remove it.
Look for jumpers JP10 and JP11 near the fuse at the rear of the DSP-232 as shown in figure 3-6
below. Jumper JP10 controls the output level of radio port 1, and JP11 controls the output level
of port 2. When the jumper is towards the right, the output level is high (high and low are printed
on the circuit board near the jumper for your convenience). Move the jumper for the radio port
3-6 September, 05