[Elecraft] Chinese Filters on eBay

[Wayne Burdick]

Hi Petr,

We go to great lengths to ensure performance of our K3/K3S crystal filters. First we 100% screen the crystals, testing them individually for electrical and physical IMD, activity level, Q, and center frequency. We then burn in, test and screen the finished filters. Finally, we label them clearly with the offset parameters required to set up the firmware. Lacking this final step, you could have filters that are not correctly centered. We also provide matched-frequency filters on request.

At the prices shown for these unauthorized knock-offs, you couldn't even buy the high-quality crystals themselves, much less put together and properly test the filters. 

Caveat emptor.

Wayne
N6KR



On Nov 2, 2016, at 10:12 AM, "Petr, OK1RP/M0SIS" <indians at xsmail.com> wrote:

> Even although I did not measured them or even touched I am not recommending
> to purchase these filters. Even the soldering quality is giving a hint about
> the overall quality. You do not know anything about the used xtal's cuts,
> their parameters, matching in filter etc. The QC will be zero (as always in
> Chinese junks), return postage is higher than price itself. It is "ex-gratia
> problem" purchase...
> 
> My 2c add...
> 
> 73 - Petr, OK1RP