Timewave DSP-232, Operating Manual

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Chapter 3 Radio Installation
Note : make all connections with all power off.
1. Connect your fabricated cable from the DSP’s RADIO 1 or RADIO 2 connector to your SSB radio.
2. Connect your SSB radio to a dummy load.
3. Turn on your computer, start its terminal program, enter its Dumb Terminal mode, then turn on the DSP.
4. If your SSB radio has a “monitor” facility that lets you listen to the audio signals entering the microphone
or phone patch jacks, turn that monitor circuit on.
5. Switch the radio to LSB (lower sideband).
6. Set the radio’s Meter switch to the ALC position. If the radio doesn’t have an ALC indication, set the
meter switch to I
P
or I
C
to read the plate/collector current. If a current reading isn’t available, set the meter
to indicate power output.
7. Enter the
CALIBRATE
mode by entering:
CAL
Note : 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).
The DSP has a transmit watchdog timer circuit that unkeys your transmitter automatically after thirty (30)
seconds.
8. Rotate the microphone gain control CCW so it’s off.
9. Press
K to key the transmitter. Increase the microphone gain control clockwise until hear a continuous tone
from the radio’s monitor output (through the radio’s speaker or headphone jack.)
10. Tap the Space Bar several times until the lower pitched of the two tones (Mark) is heard.
11. Rotate the microphone gain control clockwise from its OFF position about a quarter turn.
12. Turn the DSP’s rear-panel AFSK LEVEL pot CW until the ALC meter shows a small deflection from its
unmodulated mark. Check the radio’s plate/collector current or output power indicators.
13. Adjust the AFSK LEVEL control until the radio’s indicators show approximately thirty percent (30%) of
the manufacturer’s rated full-power reading.
Example: If the manufacturer’s plate/collector current specification for clockwise operation is 200 mA, set
the AFSK LEVEL pot and your microphone gain control so that the plate/collector current indicates
approximately 75 mA.
14. Press
K to return to receive mode.
15. Press
Q to “Quit” (exit) the CALIBRATE routine.
16. Remove the dummy load and connect your antenna line. Then, tune your radio to a clear, unoccupied
frequency.
17. Set the receiver’s audio volume control (AF GAIN) to the position you would normally use for CW
reception. This is the approximate receiver audio output level for best receive performance from your
DSP’s modem.
3-8 September, 05