KSB2 Crystal Identification prior to 2.5KHz bandwidth build

Posted by Leigh L. Klotz Jr WA5ZNU on Oct 28, 2004; 6:52pm
URL: http://elecraft.85.s1.nabble.com/KSB2-Crystal-Identification-prior-to-2-5KHz-bandwidth-build-tp371142.html

My K2 is #3121 and the KSB2 adapter instructions are Rev C, May 2, 2002
and my board is "SSB Rev D (C) 1999 Elecraft."
The part number on the crystal envelope is E850006 and the crystals are
labeled "ECS V 4.9136-S KOREA D2".
The calibration number on the envelope is 3.7.

As I do more PSK operating than SSB, I am thinking of the 2.5 KHz
modification, and doing it at build time since it's easier then.
I've read KI6WX's paper of July 18, 2002, but it's not clear to me
whether I need to order E850006.

Since my K2 is #3121 is > 3000, I think it already includes XFILMDKT*
2nd Filter Upgrade for the K2, although John's paper claims an
improvement over that.

Furthermore, my KSB2 instructions claim a 2.2 KHz bandwidth, but looking
at the table in the KI6WX paper, the capacitors in the parts match the
"original" which John says are not 2.2Khz.  I'm having a little trouble
sorting out legacy information from current information, and applying it
to my Revision D SSB Board and Revision C 2/2002 instructions.

If I want to build my KSB2 board for 2.5 KHz, do I need to order a new
set of crystals E850006 first?

Thanks,
Leigh WA5ZNU

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