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1 OPERATING INSTRUCTIONS
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 subtone 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 -6dBm (388mV RMS)
at 1kHz. The level may be measured between pins 6 and 1 on the test socket. The
adjustment range is approximately -30dBm to +10dBm.
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.
RF Technology T220
Changes or modifications not expressly approved by
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
authorities.
RF Technology equipment is subject to
continual improvement and RF Technology reserves the
right to change performance and specification without
further notice.
WARNING
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