Re: ISB Receivers
Synchrodyne, I installed and serviced R408s and recall them as only having one audio output from it's single IF. It couldn't do ISB. The bandwidth would go narrower than 1 KHz for CW. The receiver was very sensitive, quiet and repairable.
The R551 could not match it's performance on 500 kHz, but of course was good enough for type approval. I never saw an R551 with ISB capability but don't doubt the sales department brochure would cover all possibilities in the hope of more sales.
73, Andrew
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