[Elecraft] KSB2-Filter Measurements

[VR2BrettGraham]

W3FPR added:

> > -----Original Message-----
>  ... - but I just can't pull some things
> > through on the K2 that I can with the 950 fitted with decent after-market
> > filters.  ....
>
>Comparing the K2 to any other rig outfitted with after-market filters is not
>really a fair comparison.  It does make me wonder how the K2 would do with
>similar after-market filters -- alas, those filters do not seem to exist.

Yes, one could say it is unfair, so instead consider any rig with OEM
filters against that rig with decent after-market filters - especially
those from say INRAD - anyone who has used an INRADed rig will
no doubt appreciate what after-market filters might do for our K2s!

>With almost 5000 K2s out there now, I wonder if InRad is having second
>thoughts about providing filters for the K2 - it may require a non-SSB K2 to
>fit them in physically, and with the small market created by that simple
>fact, they may still not be interested.  Actually, the filters on the K2 are
>not shabby by any means, but like most anything else, could be improved with
>sufficient bucks and effort.

An INRAD CW filter for the K2 is already available, but W2VJN
suggested to me I might not want to buy one as it's hard to use - no
ability to select it - so no point in doing more than a limited production
run & call them prototypes.  Even then, the cost was not far into the
USD three-digit range - easily justified based on the expectation of
what it could do, but perhaps a bit too dear seeing how it ended up in
the junk box (being stuck having to always listen through the INRAD
filter equally wasn't on).

One INRAD filter can be made to fit in a K2 w/KDSP, KPA, KSB &
KNB & I believe I can find space for another.  To be able to
complement the K2's stock filters with one good CW & one good SSB
filter would be fantastic & definitely nowhere near as costly as doing
what many of us do to other rigs (like coming up with something in the
area of USD 1k to INRAD most of an MP, for example).

No connection with INRAD here other than 20+ years of using their
products & purchasing one of the last K2 filters George had made
up despite the difficulties using it.  Perhaps there is more to it than
we realize, but INRAD sales are not detrimental to Elecraft as they
are for Brands I, K or Y.  Instead of building something from scratch,
it's unfortunate that with the K2 it is not possible to easily use any
alternative filter from the front panel.

73, VR2BrettGraham