> This MRFE6VP61K25H solid state device is catching on fast in amateur radio > circles. HF Amps next. > > http://www.m2inc.com/pdf_manuals/2M-1K2.pdf
Here is the tough time with this, because I'm sure most people take device manufacturer's data at surface value. All of this stuff, to this point of time, is mostly vaporware. Here are the worries: 1.) While manufacturer's make wild claims about device VSWR tolerance, those specs are really just creative marketing fantasy. A 2:1 SWR would instantly blow the device up if peak voltage breakdown is exceeded, or over a short period of time if heat limits in the junction are exceeded. If you do not see SWR fault protection, and there are no current limits, you can bet devices will fail with some conditions of mismatch. Their popular U-tube video is at pulsed service with a power limited supply. I can do the same thing with MRF150's, and actually designed a medical device that ran 1000 watts of peak output power on two MRF150's, without SWR protection, on 27.120 MHz. The reason it lived is the power supply would barely supply 100 watts average power, and it was pulsed duty cycle with very low Q filters and matching. 2.) No SSB IMD spec's. 3.) All public data appears to be matched narrow-band class-C pulsed service. 4.) Getting heat out of a small surface transfer area at high power and high duty cycles is a major problem. There was a good marketing presentation by the device manufacturer, but nothing indicates it is anything special for HF or linear service, or going to "catch on fast". 73 Tom _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK