[Elecraft] Flaw in the 1.8 kHz roofing filter

[Fred Atchley]

At the recent Santa Barbara Hamfest, Eric addressed a problem with the early
filters in the K3. 

The frequency would change unexpectedly. Eventually the problem was solved
by cleaning. 

It was found that particles left over from the crystal manufacturing were
modifying the freq.

Inrad is just down the street from Elecraft and together they resolved the
issue.

 

I use the 1.8 in my K3 (#2241) with great results.

 

73, Fred AE6IC