Hi,
I'm trying to dig up the specs and a source for a Collins
526-8605-010 mechanical filter. (or 526-8604-010 - they seem to have
identical descriptions) These are 2.8Khz controlled delay filters, and
are useful for ALE, multi-tone, OFDM and other 'wide' HF digital
modes, as most stock and aftermarket filters are too narrow to pass
the full signal on RX and TX.
Unlike speech, the raw waveforms of these modes contain very little
energy above 3kHz, so there is no need for the IF filter to shape
things on TX, enabling wider filters to be used without spilling
energy into adjacent channels like 'enhanced'/wideband SSB.
Any ideas?
--
Mike Hudson
VA3PFX
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