
Section 5. Installation
5-4
Note: Step 4 is for full-duplex base or repeater installations only. Simplex
users can skip on to step 5.
4.
SET REPEAT AUDIO GAIN:
Enter the command “33# 1#” to set the Model 30 to Half-Duplex. Enter the
command “93#”. Supply a full quieting signal to the receiver with a 1 kHz
audio tone at 70% of full channel deviation (typically 3.5 kHz), the
transmitter should key. While monitoring the transmit channel with the
service monitor set to duplex, adjust the RECEIVE LEVEL control until the
transmitter deviation matches the input deviation. If a full duplex capable
service monitor is not available, another radio can be used to supply the
signal into the receiver. Now insert a 500 Hz, 1000 Hz, and 2000 Hz tone.
The output deviation should remain flat. If it does not, try moving the
position of JP2. If you do move JP2, check the repeat audio for unity gain
again. OUTPUT DEVIATION = INPUT DEVIATION
Enter a “#” to return to the program mode.
Note: The CARRIER detector operates on audio after the RECEIVE gain
setting, so it will interact with the RECEIVE LEVEL adjustment. The
CARRIER LED must be on during this test; if necessary, adjust the
CARRIER control to force it on. When done with all RECEIVE
LEVEL adjustments, reset the CARRIER ADJUST as you did in
step 1.
5.
CARRIER
ADJUST:
a.
INTERNAL SQUELCH (no connection to pin 8):
Set JP7 and JP8 to the “A” position. Adjust the CARRIER ADJUST by
watching the CARRIER LED. It should be set exactly like the squelch on
a receiver. This adjustment must be made after the RECEIVE LEVEL is
set.
b.
EXTERNAL
SQUELCH:
When using an external COR, set JP7 to the “B” position. JP8 will select
the COR polarity. Adjust the COR threshold using R90 while watching
the CARRIER LED for optimum performance.
Note: Since the CARRIER detector operates after the receive audio
amplifier, any changes to the RECEIVE LEVEL will affect the
CARRIER detector. The CARRIER detector requires unfiltered
discriminator audio for proper operation.
6.
SIMPLEX SAMPLING WINDOW SETUP:
If the Model 30 is to be used in
any of the simplex modes, the automatic sample window command should be
executed. This step should be skipped by Half-Duplex users.
Enter command “33# 2#” to set the Model 30 to Simplex VOX. Enter
Summary of Contents for 30 Worldpatch
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