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Re: First class E in France ?

PostPosted: Thu Jun 10, 2010 9:28 pm
by Gilly
Hi Rene

Are you going to order the FETs from Steve....

What is the efficiency of your TX ... power in to power out ?


Re: First class E in France ?

PostPosted: Fri Jun 11, 2010 10:05 am
by f6bir
Hi Wayne

I dont order RF mosfet to Steve for the moment I had order only kits for modulator and some damper diode
The IRF260 I can find now in France in Radiospares
May be for my futur poject (bandswitching 80/40m transmitter ) with more power I will order FQA11N90 or similar

The the efficiency of my TX is not the best 75/80% because I use only 70VDC power supply to safe my 500v RF mosfet
Last test I did:
with 20VDC carrier
60V drains peak
power supply 65VDC 2.5A ->160W input

RF power on 50 ohms dumy load ->120w at power meter (220v PP)
efficiency 75% ?