User's Manual

Table Of Contents

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RF Technology T800 Page 21

7 SPECIFICATIONS 7.1 Overall Description

7 SPECIFICATIONS

7.1 Overall Description

The transmitter is a frequency synthesized, narrow band FM unit, normally used to drive a

watt amplifier. It can also be used alone in lower power applications.

Various models allow 2-25W of output power to be set across a number of UHF frequency

bands. All necessary control and 600Ω 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 sub-tone capability is built into the modules. The CTCSS tone can be 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.

7.1.5. Microprocessor

A microprocessor is used to control the synthesizer, tone squelch,

PTT function and facilitate

channel frequency programming. With the standard software, RF Technology modules also

provide fault monitoring and reporting.