[ICOM] Re:ICOM] TX audio on 775

[Igor Sokolov]

The problem persists with DSP disabled. So it does with the compressor
disabled.

73, Igor UA9CDC



> It is possible to disable the DSP in the 775 and have all SSB generation
> done in analog rather than digital fashion.  Would be interesting to see
if
> the problem persists after the DSP is disabled for Tx.  (It can be
disabled
> from the front panel menu).
>
>
> ----- Original Message -----
> From: "Adam Farson" <farson at shaw.ca>
> To: "'ICOM Reflector'" <icom at mailman.qth.net>
> Sent: Sunday, October 15, 2006 1:25 PM
> Subject: RE: [ICOM] Re:ICOM] TX audio on 775
>
>
> > Hi Clete,
> >
> > Correction...it is not a compandor; it is a compressor. There is no
> > complementary expansion function in the receiver.
> >
> > In the IC-775 series, the compressor is an analogue circuit in the 455
kHz
> > TX IF chain. In the newer IF-DSP-based Icom transceivers (IC-756Pro
> > series,
> > IC-7800, IC-746Pro, IC-7000) it is a process in the DSP algorithm.
> >
> > I remember the old echo suppressors from my years in the telecom
industry.
> > They were analogue, and DSP-based adaptive echo cancellers replaced
them.
> >
> > There is a general article on compression on my website.
> >
> > http://www.ab4oj.com/icom/ssbcomp.html
> >
> > Cheers for now, 73,
> > Adam VA7OJ/AB4OJ
> >
> >
> >
> > Scanned for viruses by Blue Coat
> > http://www.WinProxy.com/
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
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>
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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