Uniden BEARCAT 680, Owner'S Manual

8

3 on page 4) displays this data. Press and hold the 

PTT

 button on the 

microphone to see the RF output power levels. Release the 

PTT

 button to 

see incoming signal strengh.

reCeive

Be sure that the power source, antenna, and microphone 

are properly connected before proceeding. 

1.  Turn unit 

on

. Set 

VOLUME

 to a comfortable level. 

2.  Select 

Channel

. 

3.  Set noise limitations as desired 

(ANL/NB)

.

4.  Adjust squelch.

ƒ

Turn 

SQUELCH

 fully clockwise so only strong signals can get

through. 

ƒ

Turn 

SQUELCH

 fully counterclockwise until you hear a hiss. Every-

thing gets through - noise, weak signals, and strong signals. 

ƒ

Turn 

SQUELCH

 back clockwise until the hiss stops. Only clearer 

signals get through. 

Set Squelch only when the radio is not receiving a strong signal. 

5.   Press 

LO/DX

 button to set the RF gain sensitivity to Local or 

Distance. 

6.   Press 

HI/LO

 to adjust the microphone sensitivity (mic gain) 

between LO and HIGH. 

transmit 

Perform a voltage Standing Wave Ratio (SWR) measurement prior to using the 

transmitter. A SWR ratio in excess of 2:1 may damage the transmitter. 

Be sure to read and understand Part 95, FCC Rules and Regulations, before 

operating your transmitter. 

1.   Select a channel. 
2.   Press 

HI/LO

 to adjust the microphone sensitivity (mic gain) be-

tween LO and HIGH.