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[Yaesu] Filters for the FT-920

To: <yaesu@contesting.com>
Subject: [Yaesu] Filters for the FT-920
From: mdowning@wm7d.net (Mark A. Downing)
Date: Wed, 13 Sep 2000 09:31:45 -0700 (PDT)
On Wed, 13 Sep 2000, Rick Morris wrote:

WARNING... BIASED opinion here (GRIN).

> It looks like there are a couple of ways to go.  Options are offered by
> Yaesu and International Radio.  Prices are comparable.

Get the INRAD filters...

> 1) Would I really see a difference in SSB performance switching from a
> 2.4 kHz mechanical filter to a 2.1 (or even a 1.8) kHz crystal filter in
> the OEM slot? At least enough of a difference to justify taking a
> soldering iron to my otherwise perfectly-working '920?  What is the
> impact on xmit audio to switch to the 1.8 filter?

The change in the radio is VERY dramatic with the INRAD filters. 

> 2) How much improvement should I expect in cascading a 2.1 and a 1.8 kHz
> filter?  Engineering school was a long time ago, but the performance
> curves on the INRAD web page really don't tell you much either.  Other
> than helping to try and eliminate filter blow-by, is it really going to
> help much?

The INRAD filters have much sharper skirts than Yaesu's filter. It's 
REALLY too bad that Yaesu didn't make any option SSB filters. It would
have been nice to play with them as well as the INRAD filters.

> 3) Anyone know someone actually using the INRAD switch board mod that
> can tell me how the function of the NARROW button is affected?

It doesn't change the function of the narrow button. When narrow is NOT
selected, you go thru the SSB filter(s), and when narrow is selected, 
you go thru the CW filters. If you have the switch kit installed, with 
two filters you get a cascaded filter.

George is GREAT to deal with, and has a great product. My biggest complaint
with my FT920 was the crappy SSB filter. I was having a rough time with 
AGC overload when I first started contesting. The DSP simply doesn't cut
it for filtering and the stick filter is garbage. Yaesu suggested I contact
INRAD, and my story began there. I have TWO of the filter switch kits, the
2.1 and 1.8 SSB filters and the 400 and 250 CW filters in my 920. They work
like a champ and really makes the radio a joy to use.

--Mark (WM7D)


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