[Elecraft] K3 - Performance on 6M?

[James Duffey]

Eric - I used the numbers from the January 2009 QST tests, where the ARRL measured -136 dBm MDS with the internal preamp on, and either -130 dBm in a 400 Hz bandwidth or -128 dBm in a 500 Hz bandwidth with the preamp off.

using

MDS = -174 dBm + Noise Figure + 10*log(Bandwidth)

Noise Figure = 174 + MDS -10*log(Bandwidth)

QST measured an MDS of -136 dBm in a 400 Hz bandwidth with the preamp on, which gives a noise figure of

NF = 174 -136 -10*log(400)

   = 11.98 dB

Which I rounded up to 12 dB in my note. 

Is there an error in my methodology? The -133 dBm to -135 dBm you quote as typical would only make the noise figure worse than the 12 dB NF I calculated from the ARRL data. Did I miss something? I don't think I ever referred to MDS in the mid -120s. - Duffey

--
James Duffey KK6MC
DM65tc
Cedar Crest NM
< jamesduffey at comcast.net >