[Icom] IC-775DSP: an undocumented feature ???

Wed, 31 Mar 2004 11:16:14 +0100

No any response so far. Though it would be very interesting to know if
anybody else can repeat the same experience.

Thanks and 73,

Vladimir EU1SA

----- Original Message -----
From: "SM4RNA Anders Janis" <[email protected]>
To: <[email protected]>
Sent: Tuesday, March 30, 2004 11:20 PM
Subject: Re: [Icom] IC-775DSP: an undocumented feature ???

> Have you got any respons in this issue?
>
> I will try it next weekend.
>
> 73 de Anders
>
> ----- Original Message -----
> From: "Vladimir V. Sidorov" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, March 28, 2004 10:22 AM
> Subject: [Icom] IC-775DSP: an undocumented feature ???
>
>
> > Hi all,
> >
> > Playing with the radio some time ago I've noticed something new for me
at
> > the 775. Supposingly the APF is only working for CW. But apparently if
the
> > button is pressed in SSB mode, it also works. The effect is not as
drastic
> > as in CW, but certainly the overall sound changes itself. It is
noticeable
> > for rather weak signals, only.
> > It looks like there comes a resonant frequency within the bandpass, and
the
> > resonant is around 1200 Hz what makes the incoming signal more ringing
and
> > more readable. At some weak signals the button works like a switch,
> > illigible - non-illigible.
> > The only explanation I can imagine is the fact that switches in the
> > transceiver are made on pin-diodes. Accordingly there might come leakage
of
> > an incoming signal through the non-fully unswitched diode and the APF
> > circuit partially remains working.
> >
> > Before posting this message I have made several checks to be sure, I am
> > quite far from gallucinating... and for sure there is an effect on weak
> > signals, as described.
> >
> > Did anybody else notice the same?
> >
> > And if somebody wants to repeat my experience, let me remind you once
again,
> > it is only working for weak signals, there is no any difference in
receipt
> > of strong ones.
> >
> > Thanks and 73,
> > Vladimir EU1SA
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC, [email protected]
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> ----
> Your Moderator: Dick Flanagan K7VC, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/