AW: [K3] G4AON and his K3
Posted by
Klaus Koppendorfer on
Jan 02, 2008; 11:36am
URL: http://elecraft.85.s1.nabble.com/K3-roofing-filter-choices-tp457905p457909.html
sorry.. IMD has to be "MDS" !!!!!!!!
done on 20meter with 4pole 500Hz filter
> MDS with pre -140 dBm
> MDS no pre -134 dBm
OE6KYG
>
> just tried to do also some dynamic range measurements
>
> two HP 8640 Generators (out +20dBm) attenuated to 0dBm into
> an 6dB coupler attenuated to -10 dBm into an stepp-attenuator
>
> done on 20meter with 4pole 500Hz filter
> IMD with pre -140 dBm
> IMD no pre -134 dBm
>
> dynamic range no pre
> spacing IMD-Level Dynamic
> 20 kHz -31 dBm 103 dB
> 5 kHz -31 dBm 103 dB
> 2 kHz -34 dBm 100 dB
> +/- inaccuration
>
> very happy
> 73
> klaus
> OE6KYG
>
>
> > My measurements give a 3rd order dynamic range of around 100 dB at
> > 2 KHz signal spacing with a 400 Hz 8 pole filter and slightly better
> > with a 2.8 KHz 8 pole filter (around 105 dB).
>
> >We measured a dynamic range of c. 106db (+/- a few dB) from 100kHz down
> >to 2kHz with the 8 pole 400Hz filter on 20m. So both measurements (by
> >DK4YJ with K3 #00067 and G4AON with K3 #00080) are in the same ballpark.
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