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

[JMILLER1706 at cfl.rr.com]

Thanks,
Can anyone recomend which filter in the 775 needs to be replaced?  The 
2.1 kHz SSB filter?  Which Inrad model should be used?
Jim N4BE

----- Original Message -----
From: Anders Janis SM4RNA <sm4rna at telia.com>
Date: Thursday, December 7, 2006 1:46 pm
Subject: Re: [ICOM] IC-775 filters (Was  Icom 781 vs. 756 Pro 3)
To: ICOM Reflector <icom at mailman.qth.net>
Cc: = José Luis Lavalle = <jlavalle at afip.gov.ar>

> 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
> > >>> 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/
> > >>
> > >>
> > >> -- 
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> > Date:
> > >> 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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> 
> ----
> 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/
>