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Chapter 2 47
Testing AMPS Base Stations
Receiver Squelch Threshold
Chapter 2
Testing AMPS Base Stations
13.Set an initial RF generator level in the Amplitude field. This value
depends on the sensitivity of the receiver; but −90 dBm should be a
good starting point. At this point you should be able to turn the Test
Set’s Volume knob clockwise and hear a 1 kHz tone from the Test
Set’s speaker.
14.Set the Amplitude field to increment in 1 dB units. To do this,
position the cursor in front of the Amplitude field, press the
Incr Set key, and enter 1 dB using the keypad.
15.With the cursor in front of the Amplitude field, turn the knob
counterclockwise to decrease the Amplitude setting until the
received audio is no longer heard on the Test Set’s speaker (or until
the AC Level reading drops suddenly). The RF amplitude at which
the audio signal is no longer output is the squelch threshold.
Turn on FM
modulation
for the RF
generator
and set to
8 kHz.
Set a initial
level of
−90 dBm.
Enter the
RF channel
number.
Set to On.
On/off
8.00
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