[Elecraft] K2/100: PSK31 at 50 watts Screen Shot

[Julian, G4ILO]

Bill Strong wrote:
> 
> http://picasaweb.google.com/billstrong50/DigitalMaster780#
> 
> This is a screen shot by KG3BOZ of my K2/100 running 50 watts on 40M
> PSK31. It shows IMD -23. This is a distance of about 1400 miles from
> Mississippi to Maryland at about 0100 UTC. My antenna is a Cobra Ultralite
> Senior up 20 feet. I tune it with the KAT100 and a big DXE balun.
> 
> I usually run 20 or 30 watts but I wanted to see if I could run 50 watts
> mainly for use on 80M. If I blow a small fan on the heat sink the internal
> fan rarely comes on at 50 watts during converstaional PSK31.
> 
> I use the Data Mode with the ALC set to light one bar. I transmit in the
> middle of the bandpass of the 2.2K SSB filter at 1000Hz.
> 
I would think an IMD of -23dB is barely acceptable. (My KK7UQ IMD meter
defines "good" as better than -23dB.) However IMD measurements received
off-air by software are not reliable and often show poorer readings than
actual because the SNR is not good enough. Looking at the trace on your
screenshot I would have said your IMD was better than -23dB.

-----
Julian, G4ILO. K2 #392  K3 #222.
http://www.g4ilo.com/ G4ILO's Shack   http://www.ham-directory.com/ Ham
Directory    http://www.g4ilo.com/kcomm.html KComm for Elecraft K2 and K3 
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