[ICOM] Icom filters question

[John Geiger]

Hi Vlad,

That is an interesting observation.  The manual talks about how the
passband tuning electronically narrows the passband from either side.  Do
you find that it is enough for SSB?  Also, how does PBT compare to crystal
filters in terms of skirts and ultimate attenuation?

73 John AF5CC

On Sat, Jan 30, 2016 at 6:13 PM, V Sidarau <vs.lists at gmail.com> wrote:

> John,
>
> I for one don't feel any necessity in a SSB filter because in real life
> they
> don't help at all. I used to use them in both IC-756 and IC-775. My
> personal
> opinion is, SSB filters are just a waste of money. Roofing filters is what
> really helps in SSB and nothing else. Just save your money and don't buy
> the
> SSB filter. You will not miss anything. Then, the 1.8 KHz 3rd IF filter
> will
> not suppress any 2nd IF 250 Hz skirts because the remaining parts of skirts
> at a reasonable level are much narrower than 1.8 KHz.
>
> If you are a serious CW contest operator, you may consider the 250Hz wide
> 455 Hz filter in addition to the 9 MHz one. Otherwise you may easily drop
> it, too. A single 250 Hz at 9 MHz is quite enough for daily of semi-serious
> use.
>
> I for one used to use 2 x 250 Hz filters for both CW and RTTY, while the
> narrow SSB filters were barely used at all. Over 100k QSOs made with such a
> set-up in CW/SSB/RTTY contesting and DXing.
>
> Hope it helps.
>
> 73,
> Vlad VE3IAE
>
> --
>
>
>
>
> -----Original Message-----
> From: Icom [mailto:icom-bounces at mailman.qth.net] On Behalf Of John Geiger
> Sent: Saturday, January 30, 2016 4:59 PM
> To: ICOM Reflector
> Subject: [ICOM] Icom filters question
>
> I have an Icom 756 original (complete with blue lines in the screen) and
> want to install both a narrow CW filter and a narrow SSB filter, since I do
> both modes.  I currently have a FL101 250hz CW filter installed in the 9mhz
> IF and could get a FL222 1.8KHZ SSB filter for the 455khz IF.  I would use
> just the FL222 on SSB and use both filters on CW.  So, the 2nd IF would
> narrow the passband down to 250hz, and the filter in the 3rd IF would maybe
> narrow it a little more on some blowby or skirts.
>
> I am wondering, though, if it would be better to have the wider filter in
> the 2nd IF and the narrower filter in the 3rd IF?  So I could put a FL223
> in
> the 9mhz IF, which on CW would narrow the passband to 1.9khz, and then have
> the FL53A in the 3rd IF narrowing it down even further.
>
> Would this be a better setup, or doesn't it really matter?
>
> 73 John AF5CC
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