I ordered my sub-receiver with the 2.7 filter even though my main had the
2.8 (my error when ordering the sub-receiver well after the original K3).
I experimented a bit and found by setting the offsets for both filters half
way between the 2 filters solved the wa-wa issue without any noticeable loss
in fidelity. I do realize that the skirts are not ideal but the compromise
does not seem to be audible.
If the user is mostly CW then I would use this method if you don't want the
additional cost of matched 2.7s or 2.8s.
I regularly use diversity on a net and do not have an issue when the 2.7/2.8
filters are selected. Obviously they are not exact but neither are the H & V
signals.
George
AI4VZ
-----Original Message-----
From: Joe Subich, W4TV
Sent: Wednesday, July 04, 2012 9:54 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 for CW
> As for filters, I think I'll go with the 8-pole 400 and upgrade the
> 2.7 to the 2.8. It is my understanding that the 8-poles have zero
> offset and thus I can add these to the sub in the future without
> matching issues.
I went the 2.8, 400, 200 route in the main RX and 2.8, 400 only in
the sub RX. If I had it to do over I would probably not bother to
"upgrade" the standard 2.7 KHz filters to 2.8. The 2.7 is wide
enough than one can "split the difference" in order to maintain
phase lock in diversity. If one absolutely needs better skirt
performance in a wider filter, adding the 1.8 KHz provides added
flexibility at very little added cost (replacing 2.7 with 2.8 is
$129.95, purchasing the 1.8 or 2.8 outright is only 139.95!).
73,
... Joe, W4TV
On 7/4/2012 9:15 PM, Don KB1YBG wrote:
> Hi All,
> Thanks for all the great info. Just what I was looking for. As suggested
> I'll scrap the dvr and add the KXV3A. Who knows, I may add a P3 someday
> but
> would like to put up a receive antenna soon. I have it on the K2 but have
> not used it. As for filters, I think I'll go with the 8-pole 400 and
> upgrade the 2.7 to the 2.8. It is my understanding that the 8-poles have
> zero offset and thus I can add these to the sub in the future without
> matching issues.
>
> I still have to study all the info you've provided but sounds great.
>
> Thanks and 73,
> Don
>
> --
> View this message in context:
> http://elecraft.365791.n2.nabble.com/K3-for-CW-tp7558622p7558628.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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