HydroLynx Systems 50386R, Instruction Manual

Model 50386R Receiver

HydroLynx Systems, Inc.

A102682

Page 7

3.2 Radio: Tone and Squelch

The tone amplitude and squelch levels are factory set.

CAUTION: Adjustment should be made only by trained service personnel.

Tone amplitude is 800 mV

Squelch is set to 12db (SINAD measurement); Limit: <=0.5 

•

V.

3.3 Input/Output 

The  50386R receives Radio Frequency (RF) data transmissions from remote sites as 
input. The receiver circuitry demodulates the Frequency Modulation (FM) signals into 
audible tones. These tones, presented in ALERT Format, are 2133 Hz for logic "1" and 
1920 Hz for a logic "0", and are the Frequency Shift Keying (FSK) output signal.

4.0 TESTING AND MAINTENANCE

4.1 Testing

4.1.1 RF Antenna Test

The antenna is tested for reflected power as if it were a transmitter antenna. 

!

Attach a wattmeter and transmitter to the antenna cable.

!

Select the proper slug for reverse power and frequency testing (refer to wattmeter 
manual).

!

Initiate a transmission. The duration of the transmission must be long enough to obtain 
a stable reading on the wattmeter.

!

Compare the measured reading to the antenna system's rated reflected power.

4.1.2 Tone Out 

!

Attach an oscilloscope to the tone out terminals.

!

Initiate a transmission to the receiver.

!

Verify that the signal is a 800 mVpp sine wave.

!

Refer to the radio manufacturer's service manual for adjustment instructions.

4.2 Radio Alignment

Refer to the Incoming Radio Inspection Form and to the radio manufacturer's service 
manual.

CAUTION: Radio alignment should only be performed by trained service personnel.