[Icom] Re: Icom digest, IC-746PRO issues

[j. keith carter]

Hi George; I'm surprised at your comment re the response down to DC. For a number
of years now I have used the ARRL Lab procedure of injecting white noise in the
Ant connector and looking at the complete passband response with the software
program "Spectogram". Generally the filters start to roll off at about 300 Hz and
depending on the filter shape you don't hear the garbage at line frequency or
harmonics. This procedure can generally, with AGC off, allows you to look to
about -60 db or a little better. You can generally see line (60/120 Hz) but it is
down at least 40 db. Regards, Keith, VE3JKC. ps: I haven't looked at the PRO.

"George, W5YR" wrote:

> The "secret" to hearing the exceptional audio that the PRO *can* produce is
> to go either of two ways:
>
> 1. take the receive audio from the ACC1 connector on the rear panel and run
> it through a small amplifier to as large a speaker system as you can
> provide. This provides the best available audio output.
>
> Any judgements as to audio quality of any radio using the small internal
> speakers can be pretty far off base. It takes a large, decent speaker to
> reproduce the frequency range the PRO can produce, especially from ACC1.
> That range, incidently, is essentially from zero Hz to over 3600 Hz.
>
>


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