Operations Manual

RF Technology R50 Page 5
1 OPERATING INSTRUCTIONS
1.1.4 C. SQ
(c) In the absence of any on channel signal, Turn the N.SQ. screw clockwise until the
until the noise in the speaker is muted. Then turn the screw two additional turns in the
clockwise direction.
1.1.4 C.SQ
The C.SQ trimpot is used to set the carrier squelch sensitivity. Carrier squelch is useful
at higher signal levels than noise squelch and can be used from 1 - 200 uV input.
It is provided mainly for use in fixed link applications where a high minimum signal to
noise ratio is required or where very fast squelch operation is required for data
transmission. The carrier squelch will open and close in less than 2 mSec.
In most base station applications carrier squelch is disabled by turning the adjustment
counter clockwise until the screw clicks.
The carrier squelch may be set to a predetermined level with the TecHelp software or
by using the following procedure:
(a) First turn the adjustment fully counter-clockwise. Then set the noise squelch as
above.
(b) Connect a source of an on channel signal with the desired threshold level to the
receiver's RF input.
(c) Turn the screw clockwise until the SQ LED goes OFF. Then turn the screw back
until the LED just comes ON.
1.1.5 LINE
The LINE trimpot is used to set the line and direct audio output level. It is normally set
to give 0 dBm ( 775 mV ) to line with a standard input signal equal to 60% of
maximum deviation at 1 KHz. The level can be measured between test socket pins 6 &
1 and set as desired.
1.2 Front Panel Indicators
1.2.1 PWR LED
The PWR LED shows that the dc supply is connected to the receiver and that the
microprocessor is not being held in a RESET state.