[Elecraft] SSB IMD

[Craig]

Hi Joe

A device like the Mitsubishi RD100HHF1... 

This device is used in most of the current Yaesu and Icom radios. It has very respectable IMD  figures for a 12 volt device. The 5th order  figures with the Idg at 1 amp is very good at -50dbc.   Even with IDg set at 0.5 amps the figures are still very respectable,  for 12 volt devices.

 The  QST review for the FT950 which uses these devices returned  some very good IMD figures for this model radio. 

http://myweb.tiscali.co.uk/radiokits/radio-related/Linear_PA/linear.htm

Look at the application note on the RD100HHF1. I cant find this application note on the Mitsubishi web page so who knows if the data is accurate. Its the first published IMD figures that I have seen for recent Mitsubishi  RF power devices. 


73
Craig
VK3HE



I would be careful here ... the Toshiba 2SC2879 data sheet 
clearly does -38dB IMD at 60 watts with VCC=12.5V.  There
are certainly devices capable of that level of performance  
means that there are devices capable of that level just as 
there are devices capable of similar levels of performance 
at 120-140 watts per device with Vcc=28V. 

I would expect the 2SC2879 to also be capable of this level 
of performance ... if not, I would have expected the design 
of the KPA3 to have been based on another device. 

73, 

   ... Joe, W4TV