Operating Instructions; Front Panel Controls And Indicators; Ptt; Line - RF Technology Eclipse Series Operation And Maintenance Manual

1 OPERATING INSTRUCTIONS

RF Technology could void your authority to operate this
equipment. Specifications may vary from those given in
this document in accordance with requirements of local
continual improvement and RF Technology reserves the
right to change performance and specification without
1 Oper ating Instr uctions
1.1 Fr ont Panel Contr ols and Indicator s
1.1.1

PTT

A front-panel push-to-talk (PTT) button is provided to facilitate bench and field tests and
adjustments. The button is a momentary action type. When keyed, audio from the line input
is disabled so that a carrier with sub-tone is transmitted. The front-panel microphone input is
not enabled in this mode, but it is enabled when the PTT line on that socket is pulled to
ground.

1.1.2 Line

The LINE trimpot is accessible by means of a small screwdriver from the front panel of the
module. It is used to set the correct sensitivity of the line and direct audio inputs. It is
factory preset to give 60% of rated deviation with an input of 0dBm (1mW on 600Ω
equivalent to 775mV RMS or about 2.2V peak-to-peak) at 1kHz. The nominal 60% deviation
level may be adjusted by measuring between pins 6 and 1 on the test socket, and adjusting the
pot. By this means an input sensitivity from approximately -30dBm to +10dBm may be
established.
An internal jumper provides a coarse adjustment step of 20dB. Between the jumper and the
trimpot, a wide range of input levels may be accommodated.
1.1.3 POWER LED
The PWR LED shows that the dc supply is connected to the receiver.
1.1.4

TX LED

The TX LED illuminates when the transmitter is keyed. It will not illuminate (and an Alarm
cadence will be shown) if the synthesizer becomes unlocked, or the output amplifier supply is
interrupted by the microprocessor.
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RF Technology T800
WARNING
Changes or modifications not expressly approved by
authorities. RF Technology equipment is subject to
further notice.
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