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7
SPECIFICATIONS
7
SPECIFICATIONS
7.1
Overall Description
The transmitter is a frequency synthesized, narrow band FM unit, normally used to
drive a 100 watt amplifier. It can also be used alone in lower power applications
from 2 to 25W. All necessary control and 600 ohm line interface circuitry is
included.
7.1.1 Channel Capacity
Although most applications are single channel, it can be programmed for up to 100
channels, numbered 0--99. This is to provide the capability of programming all
channels into all of the transmitters used at a given site. Where this facility is used in
conjunction with channel-setting in the rack, exciter modules may be ``hot-jockeyed''
or used interchangeably. This can be convenient in maintenance situations.
7.1.2 CTCSS
Full EIA subtone capability is built into the modules.
programmed for each channel. This means that each channel number can represent a
unique RF and tone frequency combination.
7.1.3 Channel Programming
The channel information is stored in non-volatile memory and can be programmed
via the front panel test connector using a PC and RF Technology software.
7.1.4 Channel Selection
Channel selection is by eight channel select lines. These are available through the
rear panel connector. Internal presetting is also possible. The default (open-circuit)
state is to select channel 00.
A BCD active high code applied to the lines selects the required channel. This can
be supplied by pre-wiring the rack connector so that each rack position is dedicated
to a fixed channel. Alternatively, thumb-wheel switch panels are available.
RF Technology T220
The CTCSS tone can be
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