Service Mode; General - Codan NGT 2010 RF Technical & Service Manual

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:
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NOTE
NGT Transceiver System Technical Service Manual
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
Preset adjustments, which are normally factory-set, require attention only
if components are replaced that affect their settings.
NGT—Checks and adjustments
153