37
Deviation and squelch thresholds
Tuneup
August 2004
© Tait Electronics Ltd
Squelch and Signalling Thresholds tab
Squelch Detect
Type: Noise Level
Sets the squelch mute opening points of country, city, and hard when the
squelch detect type is set to noise level. Each value can be changed from 8
to 20 dB SINAD for specific system requirements.
The default values for each are:
■
Country: 8 dB SINAD.
■
City: 12 dB SINAD.
■
Hard: 20 dB SINAD
Note
The hysteresis when the squelch detect type is set to noise level is
fixed at a preset level, approximately 2dB RF.
Opening Pt for
Squelch Detect
Type: Signal
Strength
Sets the squelch mute opening points of country, city, and hard when the
squelch detect type is set to signal strength. Each value can be changed from
-30 to -119 dBm for specific system requirements.
The default values for each are:
■
Country: -115dBm
■
City: -113dBm
■
Hard: -107dBm
Hysteresis for
Squelch Detect
Type: Signal
Strength
Sets the hysteresis of country, city, and hard when the squelch detect type is
set to signal strength. The hysteresis determines how much lower than the
opening point the mute closing point will be.
The default values for each are:
■
Country: 9dB
■
City: 8dB
■
Hard: 4dB
Each value can be changed from 2 to 20dB for specific system requirements.
However, as a guideline use a higher hysteresis value for lower opening
points, and a lower hystersis value for higher opening points.
Opening Pt and
Hysteresis for
Signalling Modems
Determines the threshold and hysteresis for the radio’s various signalling
modems. The In-band Signalling Modem includes Selcall, Two-tone, and
Single In-band tone signalling. The hysteresis determines how much lower
than the opening point the mute closing point will be.
The default value for each opening point is -119dBm, and can be changed
from -30 to -119dBm for specific system requirements.
The default value for hysteresis is 10dB, and can be changed from 2 to 20dB
for specific system requirements.
