LBI-3899
4-OHM
LOAD
1 : 1
DISTORTION
ANALYZER
OR
AC VOLTMETER
ISOLATION
TRANSFORMER
Not required if instrument
input is balanced with respect
to ground.
Figure 4 - Audio Isolation Transformer
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 TABLES 2 AND 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 and/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
EGE 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.
NOTE
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.
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