C.E.S. Model SDI-50 Manual, Level Adjustments
a tone to the telephone line, overdial a 5 digit DTMF number
terminated with the #.
Note: the program switches "*5 12" and "*5 35" must be on. If
this is a first time installation, they would have been turned
on at the factory. If this is a re-installation, review the
section on programming to set these switches on.
Set R68 to 3.0 - 3.5 kHz. peak deviation on the regenerated tones.
This level adjustment sets the level for the Morse code ID messages as
well as the level of the DTMF tones. At any particular setting the
DTMF tones will be twice the level of the ID messages. Therefore it
is important to use DTMF tones for setting the level, and not the ID
tones.
5.6
REPEAT AUDIO LEVEL R61
(5,C) If the Repeat function is to be used, it must be adjusted after
programming.
Generate a signal on the receive frequency modulated by an 800 hz tone
at 4.0 kHz deviation. Adjust R61 to 4 kHz deviation on the
transmitter frequency.
5.7 VOX SENSITIVITY R99
(5,C) For simplex mode only. To adjust the VOX Sensitivity, the SDI-
50 must be programmed for the simplex mode. First set R99 fully
counter clockwise. Call the SDI-50 from a land line; answer the call
and speak into the telephone in a normal voice. Monitor the DC
voltage at pin 7 of U19 while adjusting R99 in a clockwise direction.
Advance R99 until the voltage at pin 7 goes low with voice audio and
returns high with no audio.
An easy way to make this adjustment is to call (from the mobile or
handheid) a local recording such as Time and Temperature. While
listening to the message turn R99 clockwise until you hear the sample
rate change.
Before going on to program the CES SDI-50, you must have properly
completed the previous installation section and have the interconnect
connected to the radio and telephone line.
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