Check schematic - 81910 9 mhz If amplifier in folder A4.
The extra IF amplifier in the 565 Orion is present in both the 500 and 250
cycle path - that is why the 600 hz filter originated by W4ZV is put in the
1 khz slot which does not have the extra IF stage.
The Orion 566 (OII) does not have an extra IF amplifier for the 300 hz
filter
(or any other filter) as shown in folder A4 81999 If amplifier for OII.
Hank K7HP
----- Original Message -----
From: "bob finger" <finger@goeaston.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, March 25, 2008 12:05 PM
Subject: [TenTec] Orion....use of 250 hz filter
> John K4NP wrote in part:
>
> I had read the info on the insertion loss and increased IMD when using the
> 250 Hz roofing filter. As a result, I decided to go with the INRAD 600 Hz
> filter in the 1 KHz slot.
>
> Last week, I picked up a model 219 filter at a fair price. My results
> have been quite favorable.
>
> John: The problem is with the 500 Hz slot, thus the work-around with the
> InRad 600. The 250 Hz slot does not, to my knowledge, have the IMD
> problem and has no additional gain stage as does the 500 slot. The
> InRad 600 works so well tho that I find no discernible improvement using
> the 250 Hz roofing filter even during very crowded contest conditions.
> Thats why my 250 is turned off in menu. I would suspect your results
> would be "normal" on the Orion.
>
> Thats the reason many of us went to the InRad 600. It works fine and
> allows one to hear a bit more around the edges when running in a contest.
> When running 250 Hz is too narrow to ever hear the callers who don't know
> how to zero beat, or think they have a better chance calling 200 Hz off
> center. 73 bob de w9ge
>
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>
>
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