[Elecraft] RSGB RadCom K3 review posted on RSGB Members web page

[Eric Swartz - WA6HHQ, Elecraft]

Looks like he clearly had a bad 500 Hz filter. It does not match our 
measurements here or Sherwood's.  We'll make sure the customer gets a 
replacement.

We were not contacted prior to publication so we were unable to replace 
it ahead of time.

Also, their TX tests were incorrectly run at 120W instead of at our spec 
limit of 100w.  TX IMD will degrade at least 5 dB at 120W. That's there 
for the CW guys ;-)

73, Eric  WA6HHQ
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AD6XY - Mike wrote:
> So... to your figures. The 500Hz filter is 8 dB worse than the 2.7 kHz
> filter out of band but at close spacings. According to the review it suffers
> non-linearites not noted in the 2.7kHz stock filter nor the 8 pole INRAD the
> 400Hz filter. These showed odd properties with tone spacing that makes me
> think it was the DSP responding to the wider skirts of the 5 pole 500Hz
> filter but maybe that particular filter had a fault, it happens with
> crystals. Even so 88 dB dynamic range at 2kHz is not at all bad.
>
> I am sure the experts can explain this behaviour but for now I think it
> might be better to order an 8 pole 400Hz filter than a 5 pole 500Hz one -
> you will be able to sleep better.
>
> Mike
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