Tait TB8100 User Manual page 113

Filter
Line level
TB8100 Service Kit User's Manual
Transmit Path
In the Add or Edit Channel Profile dialog box, Signal Path tab, the lower area
lets you configure transmit paths. A transmit path connects received audio or a
line input to the transmitter.
The Filter drop-down lists let you select an audio filter for each enabled
transmit path. The options are the same as for the receive paths, except that
emphasis filters replace the de-emphasis ones.
Option Description
Flat full band Passes audio evenly across the audio spectrum.
Flat speech Passes only speech frequencies.
band
Pre-emph Passes speech, amplifying higher frequencies. This option can be
speech band used for transmitting to systems with de-emphasis.
Pre-emph full Passes all audio, amplifying higher frequencies. This option can
band be used for transmitting to systems with de-emphasis.
Subaudible Passes only the subaudible band, containing any CTCSS tones or
band DCS codes. This option can be used to separate out the signalling
and put it on the line output that is connected to a tone panel.
The Line level boxes on the transmit path define the level of the line input that
the base station expects. The line level you select affects the gain across the
transmit path.
When the base station receives a line input at the level you select, it transmits
at 60% of the maximum transmit deviation. For channels using the default
profile, the maximum transmit deviation is determined by the channel spacing
(see "Channel Spacing" on page
defined by the parameter Max Tx deviation (see
page 97).
Channel spacing
12.5 kHz Narrow Band
20 kHz Mid Band
25 kHz Wide Band
119). For channels using custom profiles, it is
"Max Tx deviation" on
Equivalent Tx max
deviation (Hz)
2500
4000
5000
Working with Channel Profiles 103
60% of Tx max
deviation (Hz)
1500
2400
3000
Pre-