NGT—Checks and adjustments
NGT Transceiver System Technical Service Manual 153
Service mode
Service mode provides a set of specific channels. These channels enable you to check the
performance of the transceiver and when necessary, carry out adjustments to ensure the
transceiver meets specifications.
General
The transceiver is provided with a special Service mode to assist you to:
• check VCO1 (this is not adjustable)
• align the 45 MHz BPFs using only an oscilloscope and signal generator
• align the transformers T201 and T202 in the 455 kHz IF
• adjust the exciter output level
• adjust carrier re-insertion
• adjust the exciter output spurious balance
• adjust the channel frequency
• adjust mute
• check and adjust the PA
• check the performance of the receiver and the transmitter
NOTE
Preset adjustments, which are normally factory-set, require attention only
if components are replaced that affect their settings.
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