[ICOM] Wanted: Narrower (than stock) SSB filter for IC-735

[Jim Vohland]

Filter costs does make it tough for 735 owners. Minimal return for SSB work.

 

> From: k2gkk at hotmail.com
> To: icom at mailman.qth.net
> Date: Sun, 21 Aug 2011 20:56:34 -0500
> Subject: Re: [ICOM] Wanted: Narrower (than stock) SSB filter for IC-735
> 
> 
> Inrad makes two at the 9 MHz I.F. for $115;
> 
> #123 for 2.8 kHz
> #320 for 1.8 kHz.
> 
> They make four at the 455 kHz I.F. for $170;
> 
> #124 for 2.8 kHz
> #109 for 2.4 kHz
> #314 for 2.1 kHz
> #322 for 1.8 kHz
> 
> I guess it's tougher to build filters at 455 than 9,000 kHz???
> 
> Are the 455 kHz filters better than those at 9 Mhz? I checked
> the data sheets and noted that several of the 9 MHz filters
> had noticably more ripple across the tops of their slope curves.
> 
> The 123 appears to have just a bit sharper cutoff than the 124
> but the 320 is a miniscule amount wider than the 322.
> 
> I have located a new 109 (2.4 kHz) filter, but the asking price
> is $140 which is about half of a bare 735 is current sell price.
> 
> * * * * * * * * * * *
> * 73 - Mac, K2GKK/5 *
> * (Since 30 Nov 53) *
> * Oklahoma City, OK *
> * USAF, Ret (61-81) *
> * * * * * * * * * * *
> 
> 
> 
> 
> 
> > Date: Sun, 21 Aug 2011 18:25:51 -0700
> > From: gfiber at comcast.net
> > To: icom at mailman.qth.net
> > Subject: Re: [ICOM] Wanted: Narrower (than stock) SSB filter for IC-735
> > 
> > I want to say the FL-30 was the original SSB filter nut would have to 
> > find a print and have a look. I suspect one of your choices will be 
> > Inrad but it will not likely be a drop in, you may have to use some 
> > RG-174 to connect it up and some double stick tape to mount it. 
> > Possibly W4RT has a collins mechanical filter that would work too. I 
> > don't think the Icom FL-223 1.8 KHz filter will work as the impedance 
> > for the filter is likely wrong for the 735 circuit. And it has plug in 
> > leads where the IC-735 lead placement likely will not match and the 
> > original filter is a solder in type.
> > 
> > Gary K8IZ
> > 
> > On 8/21/2011 5:45 PM, D C *Mac* Macdonald wrote:
> > > Subject line says most all of it. I'm looking for an
> > > improvement for SSB selectivity at a reasonable(?) cost.
> > >
> > > * * * * * * * * * * *
> > > * 73 - Mac, K2GKK/5 *
> > > * (Since 30 Nov 53) *
> > > * Oklahoma City, OK *
> > > * USAF, Ret (61-81) *
> > > * * * * * * * * * * *
> > >
> > >
> > > 
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> > > Icom Users Net: Sundays, 1700Z, 14.316 MHz
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> > >
> > 
> > 
> > -- 
> > Gary Fiber K8IZ
> > GROL PG-19-6691 with shipboard radar endorsement
> > Washington State resident
> > 
> > ----
> > 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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> 
> ----
> 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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