[ICOM] IC-775 filters (Was Icom 781 vs. 756 Pro 3)

[Anders Janis SM4RNA]

I think the only correct way to do is to do something with the filters. Any 
adjustment or mod or any other type of fideling with the radio will match 
only one or two of the eight filters used in SSB/CW.

Solve the problem at it source rather than cover it up.

/Anders


----- Original Message ----- 
From: <JMILLER1706 at cfl.rr.com>
To: "ICOM Reflector" <icom at mailman.qth.net>
Cc: "= José Luis Lavalle =" <jlavalle at afip.gov.ar>
Sent: Thursday, December 07, 2006 6:50 PM
Subject: Re: [ICOM] IC-775 filters (Was Icom 781 vs. 756 Pro 3)


Yes, the 775 oscillators appear to all be digitally derived from a
master source.  I am able to compensate for the filter response some by
offsetting the passband tuning slightly when going from LSB to USB.
Perhaps I could adjust the mechanical detent on the PBT tune knob.

----- Original Message -----
From: Anders Janis SM4RNA <sm4rna at telia.com>
Date: Thursday, December 7, 2006 11:40 am
Subject: [ICOM] IC-775 filters (Was  Icom 781 vs. 756 Pro 3)
To: ICOM Reflector <icom at mailman.qth.net>,= José Luis Lavalle =
<jlavalle at afip.gov.ar>

> No! The IC-775 do not have such an adjustment. Only 60MHz master osc.
>
> On older radios as a IC-765, IC-751 it is possible, though.
>
> /Anders
>
>
>
>
> ----- Original Message ----- 
> From: "Fern Rivard" <crc at cyberlink.bc.ca>
> To: "ICOM Reflector" <icom at mailman.qth.net>
> Sent: Wednesday, December 06, 2006 9:24 PM
> Subject: Re: RE: [ICOM] Icom 781 vs. 756 Pro 3
>
>
> > Hi Jim:
> >    Yes, this may be due to a non symmetrical filter but that can
> easily
> > be corrected with re-alignment of both carrier oscillators for
> usb and
> > lsb. There's probably nothing wrong with your ssb filter but
> rather that
> > those two oscillators have to be aligned properly.
> >    Cheers from Fern  VE7GZ
> >
> >
> >
> >
> > ----- Original Message ----- 
> > From: <JMILLER1706 at cfl.rr.com>
> > To: "ICOM Reflector" <icom at mailman.qth.net>
> > Sent: Wednesday, December 06, 2006 12:48 PM
> > Subject: Re: RE: [ICOM] Icom 781 vs. 756 Pro 3
> >
> >
> >>I have a 775DSP which I am quite happy with except for the slight
> >> change in voice tonal quality when switching from LSB to USB
> (in USB
> >> the audio spectrum seems to shift slightly toward the trebles).
> I
> >> have
> >> heard someone comment here that this is due to non-symmertical Icom
> >> filters, and that an Inrad replacement would help.  I lost that
> post,>> so which Inrad model is recommended?  Also which Inrad
> roofing filter
> >> would be recommended for the 775?
> >> Jim N4BE
> >>
> >> ----- Original Message -----
> >> From: Adam Farson <farson at shaw.ca>
> >> Date: Wednesday, December 6, 2006 2:24 pm
> >> Subject: RE: [ICOM] Icom 781 vs. 756 Pro 3
> >> To: 'ICOM Reflector' <icom at mailman.qth.net>
> >>
> >>> Hi Charles,
> >>>
> >>> Have you tried various combinations of CW filter settings on
> the
> >>> Pro3?
> >>>
> >>> http://www.ab4oj.com/icom/pro_notes.html#cwfil
> >>>
> >>> Cheers for now, 73,
> >>> Adam VA7OJ/AB4OJ
> >>>
> >>> << Example: filters - I like the 781 filters (tight CW
> filters) a
> >>> littlebetter than the Pro3 only because of the way they sound
> >>> under crowded band
> >>> conditions. >>
> >>>
> >>> 73,Charles, K4ZRJ
> >>>
> >>> >
> >>>
> >>>
> >>>
> >>> Scanned for viruses by Blue Coat
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> >>> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
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> >>>
> >> ----
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> >> Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> >>
> >>
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> >> 12/6/2006
> >>
> >
> > ----
> > Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> > Icom Users Net: Sundays, 1700Z, 14.316 MHz
> > Icom FAQ: http://www.qsl.net/icom/
> ----
> Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
>
----
Your Moderator: Dick Flanagan K7VC, icom-owner at mailman.qth.net
Icom Users Net: Sundays, 1700Z, 14.316 MHz
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