John,
You are correct- the 500 Hz and 250 Hz will work great for anyone
who doesn't have an S9+40 signal right next to them in the band. I wrote
about this a week or two ago and got the business from a few folks who
wanted to remind me of the measurements regarding BDR and IMD issues. I use
mine judiciously (which means almost all the time unless I hear a problem
happening), and find both filters a big help when DXing and keeping the DX
as free as possible from the QRMers. I didn't even install them for a long
time because of the reduced performance issue, and then when I did, I found
it was not an issue for me. As I noted in my last post a little while ago,
the beauty of the Orion I is that you can use them or not. If you run into
a problem, deselect either or both of them, and now the issue is gone.
Otherwise, use and enjoy them. I also use them for S&P in contests - if
you're calling them, you don't care about others who are calling off-freq.
73, Duane
Duane Calvin, AC5AA
Austin, Texas
www.ac5aa.com
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of fraz1
Sent: Tuesday, March 25, 2008 6:38 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Orion....use of 250 hz filter
I only put out my note because, for me, the 250 Hz filter works great. As I
said, I see no impact on BDR or IMD from an operational standpoint. That
includes "close-in" strong stations.
Everyone may experience something different. My experience has been great
and wish I had done it earlier. And, yes, I have manually switched the
roofing filters looking for problems.....and finding none.......so far.
Thanks for all of the comments.
73 John K4NP
----- Original Message -----
From: "bob finger" <finger@goeaston.net>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Tuesday, March 25, 2008 6:32 PM
Subject: Re: [TenTec] Orion....use of 250 hz filter
>
>
> bob finger wrote:
>
>> .
>> 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.
>
>
> Thats what happens when you go from memory and don't check your notes.
> I was reminded in a private e-mail that I was wrong. The 250 Hz filter
> does indeed use the extra gain stage also used by the 500 Hz filter.
> Sorry if I mislead anyone. Thanks Merle. 73 bob de w9ge
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>
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