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

Tue, 6 Apr 2004 20:39:55 +0200

I can not notice the same. Maby I have bad hearing?

/Anders

----- Original Message -----=20
From: "Vladimir V. Sidorov" <[email protected]>
To: <[email protected]>
Sent: Wednesday, March 31, 2004 12:16 PM
Subject: Re: [Icom] IC-775DSP: an undocumented feature ???

> No any response so far. Though it would be very interesting to know if
> anybody else can repeat the same experience.
>=20
> Thanks and 73,
>=20
> Vladimir EU1SA
>=20
> ----- 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 ???
>=20
>=20
> > 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/
>=20
> ----
> Your Moderator: Dick Flanagan K7VC, [email protected]
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/