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

[AD6XY - Mike]

I have Radcom in front of me. The editor has two reviews, the K3 and a new
Alinco hand held. I suppose it shows the state of amateur radio in the UK
that the hand held makes the front cover.  The K3 reviews very well indeed.

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






Douglas G. Bonett wrote:
> 
> The numbers reported below are close to what I would expect if the 2.7 kHz
> and
> 500 Hz column labels were accidentally switched. Typo maybe?
> 
> Doug N0HH
> 
> 
> =========================================================================
> Yes something isn´t right. This was his measurements:
> 
> CLOSE-IN INTERMODULATION ON 7MHz band,500Hz bandwidth, CW preamp off
> 
>   2.7 kHz roofing      1.8 kHz roofing   500 Hz roofing
> 2kHz  +19dBm 101dB    +12.5dBm 96dB    +2.5dBm   88dB
> 3kHz  +19dBm 101dB    +12.5dBm 96dB    +2.5dBm   88dB
> 5kHz  +22dBm 103dB    +12.5dBm 96dB    +8.5dBm   92dB
> 7kHz  +22dBm 103dB    +12.5dBm 96dB    +13dBm    95dB
> 10kHz +22dBm 103dB    +12.5dBm 96dB    +17.5dBm  98dB
> 15kHz +22dBm 103dB    +12.5dBm 96dB    +22dBm   101dB
> 20kHz +22dBm 103dB    +12.5dBm 96dB    +25dBm   103dB
> 30kHz +22dBm 103dB    +12.5dBm 96dB    +26.5dBm 104dB
> 40kHz +22dBm 103dB    +12.5dBm 96dB    +27dBm   104dB
> 50kHz +22dBm 103dB    +12.5dBm 96dB    +27dBm   104dB
> 
> 
> 
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