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To adjust receive audio levels for conventional radios
Warning! This adjustment procedure only works if VOX input is
STOP
connected to the AGC output.
• If your firmware version is prior to 2.70, VOX is always
• If your firmware version is 2.70, VOX is always
• If your firmware version is 2.74 or later, the VOX/AGC
To check the firmware version and to check or change how
VOX is configured:
1. Connect a PC serial port to the dual channel card's front
2. Using Hyper-Terminal (or equivalent) as a terminal emulator
3. Press <ESC>? To display the channel card's current
1. Ensure that gain settings throughout the Series 4000 system are configured for
their default settings. See
2. With the base station connected to the channel card use a communications service
monitor to send a 1000 Hz sine wave at 40% radio channel deviation to the base
station.
Note
The receive audio adjustment process could also be performed if
the user were to inject an audio signal at 0dBm or 2.2V (Peak to
Peak) on the RX- / RX+ pin pair at the punch down block with all
equipment connected.
Tip
When adjusting Wireless Dual Channel Control Cards such as the
MAP27 Dual Channel Control Card, the installer can transmit the
console's generated alert tone to the connected radio or a Model
427 channel that is being aligned, and use the alert tone as its
receive audio.
3. Connect an AC voltmeter at the channel card "AGC" test point on the card edge.
connected to the AGC output. Use this procedure.
connected to the AGC input. In this case you must use a
different procedure. See
Setting Rx Levels for Dual Channel
Cards (VOX input connected to AGC input)
connection is user-configurable. The typical and default
setting is for VOX input to be connected to the AGC output,
in which case you can use this adjustment procedure. If you
have changed this setting, you must use a different
Setting Rx Levels for Dual Channel
procedure instead. See
Cards (VOX input connected to AGC input)
panel "MONITOR" jack using a Zetron cable part number
709-7452.
set the communications parameters to 19200-8-N-1-NONE.
configuration & version.
Before Adjusting Levels
Dual Channel Card Audio Levels
on page 190.
on page 190.
on page 182.
183
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