LBI-3890
13
SQUELCH ADJUSTMENT
Squelch threshold has been set at the factory to 8 dB
SINAD. Adjustment of the threshold requires changing the
tracking Data. To change the squelch tracking data, follow
the iterative procedure set forth in the "TRACKING
DATA" section, except let the desired squelch threshold
level replace the 8 +1, -0 dB SINAD level set at the
factory. BE SURE TO CHANGE THE TRACKING DATA
FOR ALL FREQUENCIES GIVEN IN TABLE 2 OR 3.
Otherwise the level will not be consistent across the
frequency band.
TROUBLESHOOTING GUIDE
INTRODUCTION
This radio is designed to be serviced by replacement of
modules an/or circuit boards. As such, there are very few
serviceable component parts contained on any of the circuit
boards within the radio. Normally, defective boards should
be replaced and returned to an Authorized Service Center.
A list of serviceable parts is given in the next section.
MICROPHONICS
Synthesized radios tend to be sensitive to shock and
vibration, creating microphonics. The construction of the
ORION radio with its die-cast aluminum frame, cast shield,
and multiple board-mounting screws, provides a high
degree of immunity. When removing printed circuit boards
or shields, note the location of all mounting hardware.
When servicing the radio be sure that no solder build-
up has occurred on the chassis or shield.
To assure a high degree of resistance to microphonics
be sure to replace exactly, all hardware removed. Be sure
that all mounting screws are properly torqued and shields
are in place. Refer to the Mechanical Layout Diagram found
in LBI-38909.
Loose or rubbing parts, especially in the VCO
area, are particularly sensitive and can cause
microphonics. Again, be certain all hardware is
properly installed and torqued.
NOTE
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