9
Powering the Receiver
plug the AC/DC ADAPTER (23) provided into the DC INPUT JACK (20)
on the back of the receiver. Then plug the power supply into an AC outlet. (Note:
Any 22v DC source with 400mA capability can also be used.) press the POWER
SWITCH (1) once to turn on the receiver. The POWER ON LED (2) and the LCD
DISPLAY (5) will now light and the receiver is operational.
Adjusting Antennas
The U-800 has two permanently attached, flexible elbow ANTENNAS (3) for diver-
sity reception. Unfold and rotate these antennas to operate the receiver. The optimal
positions of the antennas are flared 45° out from the receiver sides and 90° from each
other. For maximum range, it is always best to maintain a line-of-sight (no obstructions)
between the receiver antennas and the transmitter at all times whenever possible.
Adjusting the Mute Level/ RF Squelch
The MUTE LEVEL/RF SQUELCH (13) can be changed anytime during the main
screen display to quiet the receiver in high noise environment condition. The control
ranges are from level 0 to level 5. The level should be adjusted to a lower number
for the minimum RF squelch setting at which the RF INDICATOR (8) will remain on
while your transmitter is in normal use, up to the maximum operating range antici-
pated in use for your application. However, in areas of high RF activity, the squelch
control may need to be adjusted to a higher number. If the transmitter is off and the
receiver’s signal RF INDICATOR (8) or the diversity A or B INDICATOR (9) flickers
or stays on continuously, the squelch should be adjusted to a higher number to stop
the flickering. be careful not to select too high a number setting as this may reduce
the operating range to below what is needed. A range walk test will help in select-
ing the proper level. If the range is not critical, note that a higher level (maximum
squelch) setting will also yield a quieter mute function, which might be desired in
certain applications. The squelch level is factory preset at maximum sensitivity and
operating range (i.e. level 0 for minimum squelch level—maximum usable range).
Note: For easier intuitive operation, the MIN and MAX indications for this control
refer to the minimum and maximum operating range settings, not to the actual mute
levels selected, which are the opposite as per above.
