Fwd: [Elecraft] Sherwood on Roofing Filters, Transmitted IMD and Receiver Performance

[Vic K2VCO]

Ed K1EP wrote:
> I think that that comment was taken out of context.  In his talk, I believe
> that he remarked that some xtals lacked quality control.  I think it was
> said or implied that both the manufacturing process and testing process
> wasn't always perfect and that some xtals in the filters had some
> contamination or process defect that would cause them to have higher IMD
> products than they should. 

Elecraft's filters are either built by them (the 5-pole filters) or 
purchased from INRAD. The INRAD filters go through an additional testing 
process at Elecraft to make sure they meet specs for the K3.

So yes, there can be problems and Elecraft is taking steps to avoid them.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco