RF Technology R150 Instruções de Operação descarregar pdf (Página 20)

Page 20 RF Technology T70/T150

7.1 Overall description 7 SPECIFICATIONS

3. Adjust RV1 on the power amplifier PCB for the desired power level at the

output connector.

4. Key the transmitter off.

7 SPECIFICATIONS

7.1 Overall Description

The transmitter is a 5-25 watt output, frequency synthesised, narrow band FM unit

which is normally used to drive a high power amplifier. It can also be used alone in

lower power applications. The output power is nominally 25 Watts but can be preset

between 5 and 25 watts. 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 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.

____________________

Be sure to set the power below the rated maximum for the model of transmitter. If in doubt, allow

1.5dB cable and connector losses, and assume that the maximum rated power is 15W. This means no

more than 10W at the end of a 1m length of test cable. This pessimistic procedure is safe on all models

manufactured at the time of writing.

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RF Technology R150 Instruções de Operação Página 20