[TenTec] Dual 250 Hz filters--worth it?
Wed, 25 Feb 1998 14:18:17 -0500
I would say that it depends upon the individual preference of the
operator. I run an Omni V on CW with 500 / 1.8Nar. The frequency
response of that combination is what my old ears prefer. In unusual /
contest conditions, I switch to 250 / 1.8Nar. That really narrows it
down, in combination with the PBT / Fade / BP controls. In extreme
cases, I kick in the NIR-12.
See you in the pileups --
> -----Original Message-----
> From: Peter A. Klein [SMTP:email@example.com]
> Sent: Wednesday, February 25, 1998 2:08 PM
> To: firstname.lastname@example.org
> Subject: [TenTec] Dual 250 Hz filters--worth it?
> Here's a question for you "ultimate selectivity" Omni V and VI people.
> How much better is having a 250 Hz filter in both the 6.3 and 9 mHz
> IFs? Do you often use them in combination, or is it only when the
> gets *really* rough in a contest or pileup?
> I currently have a 250 Hz in the 6.3 IF and a 500 Hz filter in the 9
> IF. I've never owned a 250 Hz filter before, and I'm really happy I
> one for my Omni. The reduction in *noise* is in some respects nicer
> than the reduction in QRM, when compared to cascaded 500 Hz filters.
> So, how much of a jump in performance is cascaded 250 Hz filters from
> 250 and a 500? I understand that I would have better "skirts" and
> a little less noise. But does it really matter much in *practice*, or
> it beyond the point of diminishing returns for most of us?
> Peter - KD7MW
> * My opinions do not necessarily represent those of Seattle
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