Tait TM9100 Tune Up And Inspection

29 Deviation and squelch thresholds Tuneup
August 2004 © Tait Electronics Ltd
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.
Scanning Opening
Pt
Sets a threshold that will be used in an initial check for busy channel activity,
when scanning. If activity on a channel satisfies this threshold, then the radio
will check to see if the channel is suitable for capture. The default value is
set to the equivalent of the country signal strength opening point (-
119dBm), but can be set from -30 to -119dBm for specific system
requirements.
Scanning Hysteresis Sets the hysteresis that will be used in an initial check for busy channel
activity when scanning. The default value is 10dB, but can be changed from
2 to 20dB for specific system requirements.
Opening Pt and
Hysteresis for Front
End Gain Switching
Sets the point at which the gain is lowered in the receiver path (Opening
Pt), and the point at which the gain will be restored to the original level
(Hysteresis). These fields only apply to VHF radios (A, B, C and D-band),
and should not be changed from the default values of -30dBm and 20dB
respectively.
4.3 Advanced tab
Birdie Killer On/Off Shows DAC values that are used for identifying birdie (Birdie Killer On) and
non-birdie (Birdie Killer Off) channels. The radio will activate birdie killer
circuitry on channels that are determined to have a birdie (a hum or whistle
caused by internal interference). These fields are for information only, and
must not be changed from their default values of 20 and 200.
FFSK Sync.
Sequence
Sets a synchronisation sequence that is sent with every FFSK transmission.
The sequence is a 16-bit hexidecimal number (four characters using 0 to 9
and A-F), and by default is set to 3B28. This value can be changed for
specific system requirements. However, all transmitting and receiving radios
must use the same sequence.

Tait TM9100 Specifications

General

Brand	Tait
Model	TM9100
Category	Radio
Language	English