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

[AD6XY - Mike]

Bill W4ZV wrote:
> 
> 
> 
> 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. 
>> 
> 
> NOT SO...G3SJX only tested the 2.7k, 1.8k and a 500...NOT a 400.  He was
> speculating about the 400 because Sherwood and ARRL had good measurements
> with one (Sherwood had nearly identical IMD measurements with the 500
> which I posted previously - below).  
> 

The wonders of English. It depends how you read "according to the review".
In any case we now know it was a flawed filter or (if you are right about
the 1.8k) perhaps a problem in the IF of that particular K3. The faulty
500Hz filter at 40kHz spacing has a 3rd order intercept of +27 dBm !!!! Just
what we need over here in Europe to counter the broadcast signals just above
7.1 MHz.

I take Eric's point about the power measurements but I speculate most
operators (but obviously excluding all elecraft owners and QRPers who would
never dream of doing such a thing) tune their transmitters for maximum power
in attempting to crack a pile-up or for a contest. It is a fair assessment
of what it could sound like on air, in the worst hands and it is still very
good.

Mike

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