GDP-32
II
INSTRUCTION MANUAL
May 2002 Section 17, Page 24
17.6 SYNCHRONIZATION PROBLEMS
FAILURE TO RESET OR ADJUST FREQUENCY
Inability to adjust the frequency of the receiver to match the transmitter controller, or to
synchronize (reset) the receiver and transmitter controller, may have several possible origins:
Faulty Synchronization Cable
Sometimes wires can be crimped or pins loosened or broken in the synchronization cable. The
best way to check for this problem is to replace the cable with a spare cable and see if the
problem is corrected.
If a cable must be repaired, check continuity and pin designation with the diagram in Figure
17.5. Or contact Zonge Engineering for a replacement cable.
Insufficient Warm-up Time
Crystal clocks will not stabilize at the proper frequency unless given at least 60 minutes for the
crystal oven to heat up.
Crystal Oscillators Too Far Apart In Frequency
If the Crystal Oscillator frequencies are far enough apart that the frequencies cannot be made
identical by adjusting the electronic tuning circuit on the GDP-32
II
and the oscillator trim
potentiometer on the XMT-32, the solution is to adjust the mechanical trim on either the GDP-
32
II
or the XMT-32 crystals.
This problem should not occur with a GDP-32
II
and an XMT-32 that were shipped together as a
system, since the frequencies are adjusted before shipping. But if you own a newer receiver and
an older controller (e.g., a GDP-32
II
and an older XMT-16), there can be a problem adjusting the
frequencies due to relative aging of the two crystals.
1
1 See footnote page 16.23: GDP-32
II
Design, The Calibration and Timing Board, Timing
Section, Frequency Generator.
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