Operating instructions

RF Technology T350/T500 Page 19

6 FIELD ALIGNMENT PROCEDURES 6.8 Output Power

2. Key the transmitter on.

3. Adjust RV4 (line level) for 60% of system deviation (3kHz or 1.5kHz for narrow

band systems).

4. If the test signal is varying, RV4 may be adjusted to produce a level of 234mV

RMS or 660mV

p-p

at the audio voltage test connector pin 6 to pin 1.

5. Key the transmitter off.

6.8 Output Power

1. No audio input is required

2. Key the transmitter on.

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 frequency synthesized, narrow band FM unit, normally used to

drive a 50 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.

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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.