[Elecraft] K1 Noise Blanker version diffs?

[Mike Morrow]

James wrote:

>...noticed the manual has directions for Rev C and Rev D.
>...should I not have received the "latest" rev, which
>appears to be D?

Don wrote:

>The KNB1 electrical design has not changed between board revisions C and D

It's much simpler than that.  There has **NEVER** been a revision D PCB for the KNB1.  The text in the KNB1 manual has mentioned the revision D PCB since the first KNB1 was sold 6.5 years ago, but no one has a KNB1 with a rev. D PCB.

Elecraft in this and a few other of their kit manuals has sometimes referred to later revisions that don't currently exist, but that **may** be issued sometime in the future.  For the KNB1, that future has not and likely never will arrive, since there is really no substantive reason for revision.

The history of the KNB1 has shown that the most important post-production circuit change is the addition of C14, the 0.01 uF cap between pins 1 and 8 of U1, as detailed in the KNB1 manual errata sheet.  If you forget C14, the KNB1 can generate some gosh-aweful racket on certain frequencies in the 20m band as the K1 shifts between transmit and receive.

Mike / KK5F