[ICOM] WTB: FL-44A 2.4Khz filter

[k4zrj at bellsouth.net]

Please send email with details of what you have and asking price. Shipping to 30188.
73,Charles,K4ZRJ


> 
> From: Adam Farson <farson at shaw.ca>
> Date: 2006/12/07 Thu PM 09:23:06 EST
> To: 'ICOM Reflector' <icom at mailman.qth.net>
> Subject: RE: [ICOM] IC-775 filters (Was  Icom 781 vs. 756 Pro 3)
> 
> Hi Anders,
> 
> Many thanks for the recommendation!
> 
> http://www.ab4oj.com/icom/main.html
> 
> For SSB, I normally recommend retention of the FL-80 and replacement of the
> stock FL-96 with an Icom FL-44A (now quite rare) or an Inrad 109. The FL-96
> is 2.8 kHz wide; as a result, the Twin PBT is rather sloppy with this
> filter. The FL-80/FL-44A pair is probably the best filter combo Icom ever
> made.
> 
> I agree that "perfect" filter symmetry can be achieved only with IF-DSP, as
> in the radios you mentioned. This is shown rather dramatically here:
> 
> http://www.ab4oj.com/icom/passband/main.html
> 
> Cheers for now, 73,
> Adam VA7OJ/AB4OJ
> 
> 
> -----Original Message-----
> From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
> Behalf Of Anders Janis SM4RNA
> Sent: 07 December 2006 13:54
> To: ICOM Reflector
> Subject: Re: [ICOM] IC-775 filters (Was Icom 781 vs. 756 Pro 3)
> 
> I am afraid not. All filters are individuals. You must figure out by your
> self what filter or filters that "needs" to changed. Also no matter what you
> do you will be able to make make it to sound 100% alike. To do that you need
> to go DSP, like 756PRO, 746PRO or 7800.
> 
> Icom has no 2,1kHz SSB filter.
> 
> In the 455kHz filter bank the 2,7 kHz can be changed to Inrad 2,4 for best
> selectivity together with the 2,4kHz wide FL-80 in 9MHz. If you have the
> option SSB narrow filter in 455 kHz installed, the 1,8 kHz filter it can be
> replaced with a 2,0 or 1,8kHz Inrad at your choice.
> 
> In the 9 MHz IF the Inrad filters is not plug in. They need to be wired in
> with coax. It has pros and cons. The 9 MHz filters are not so sharp as the
> 455 kHz filters. Try changing the 455 kHz filter at first and then with the
> fact that it will never be 100% alike in mind, and than take the dession
> upon if it is worth wireing filters.
> 
> Also see Adam Farsons homepage. You can find informaton om the diffrent
> filters and also about the FL-80 + Inrad 109 combo. Also tha manual
> belonging to the 775 and a blockdiagram can awnser som questions.
> 
> Also I had a defect 250Hz filter for 9 MHz from Icom that was so bad it
> generated 10 dB additional attenuation than a normal filter. SO filters van
> apparently be bad.
> 
> 
> de Anders
> 
> 
> 
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