User Manual

RF Technology R220 Page 5
1 OPERATING INSTRUCTIONS
WARNING
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.
1 Operating Instructions
1.1 Front Panel Controls and Indicators
1.1.1 Mon. Volume
The Mon. Volume control is used to adjust the volume of the internal loudspeaker
and any external speaker connected to the test socket. It does not effect the level of
the 600
Ω
line or direct audio output.
1.1.2 Mon. SQ.
The Mon. SQ. switch allows all squelch functions controlling the monitor output to
be disabled. When the switch is in the Mon. SQ. position the audio at the monitor
speaker is controlled by the noise detector. The CTCSS, carrier and external squelch
functions are disabled. This can be useful when you are trying to trace the source of
on-channel interference or when setting the noise squelch threshold. the audio from
the 600
Ω
line and direct outputs is not effected by the switch position.
1.1.3 N.SQ
The N.SQ trimpot is used to set the noise squelch sensitivity. Use the following
procedure to set the noise squelch to maximum sensitivity.
1. Set the toggle switch to the Mon. Sq. position and set the Mon. Volume control
to 9 o’clock.