TB8100 Service Kit User’s Manual Working with Channel Profiles 109
Receiver channel Specifies the receiver’s nominal channel spacing. The available options are
expressed both as a description (for example, Mid Band) and as the kHz value
of the nominal channel spacing.
Note: The Receiver channel box does not determine the actual
spacing between channels. It determines the receiver IF bandwidth.
For example, 20 kHz Mid Band sets the receiver IF bandwidth to
12 kHz. Normally, you would select this option if the channels in your band
plan have a 20 kHz channel spacing. However, your band plan may be
irregular, or you may want to specify (in the channel table) a greater spacing
between channels, for example, 50 kHz.
Max Tx deviation Specifies the highest deviation that the transmit channel is permitted to have.
The available options correspond to the following channel spacings:
Subaudible
deviation
Specifies the deviation that CTCSS or DCS signalling will cause to the carrier
frequency. Options are specified both absolutely in Herz and relatively as a
percentage of the selected Max Tx deviation. Gain will be applied to the
CTCSS signalling to cause the deviation specified. If you subsequently alter the
Max Tx deviation, the Herz value of the subaudible deviation will alter, but not
its percentage.
Option Equivalent Rx IF Bandwidth
12.5 kHz Narrow Band 7.5 kHz
20 kHz Mid Band 12 kHz
25 kHz Wide Band 15 kHz
Option Channel Spacing
2500 Hz Narrow Band 12.5 kHz
4000 Hz Mid Band 20 kHz
5000 Hz Wide Band 25 kHz
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