NGT—Technical description (2010)
102 NGT Transceiver System Technical Service Manual
Second IF filter option
The second filter is fitted on a small daughter PCB (08-05890), which is fitted to the
main RF/IF PCB. When the filter is required, the relays K-1 and K-2 are switched by the
microprocessor IC408 and V207 to change the signal path to the second filter Z1.
The second filter may be either 500 Hz wide for CW and data applications
(15-10506-001) or it can be 2700 Hz wide for high-speed data applications
(15-10514-001).
The N (500 Hz) and W (2700 Hz) link on IC408 tell the processor which filter is fitted
so the synthesiser frequency is set correctly for the filter in use.
Drawing 04-03379 and 04-03378 (sheet 2)
NOTE If the PCB issue status is -06 or earlier, see drawing 04-03378 (sheet 2).
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