Topband: High power transistor for HF amp.

[Bruce]

Thanks, I appreciate the information.  The FM Broadcast station, that I do engineering, just purchased a new to the market Harris 10 KW transmitter, that just arrived today. Installation the next few weeks. I took special notice of the hot pluggable PA transistor amplifier modules using this transistor. It gets 70% efficiency. With stands very high VSWR .......   73 Bruce-K1FZ


 Tom,   I did not find any linear specs also, but did find a blurb saying it was quite linear up to a KW.  
Think will try a 900 Watt amp first, time permitting. Thank you for your research information. 


Jacques,  FB working with Freescale the manufacturer.. Looking like the device over drives at about 1 KW 
producing high harmonics, the third being trouble some.  Thank you for your information. 


Although they do not (or did not) publish IMD data, the single device I 
tried was acceptable at 800-900 watts PEP for SSB. They are a bit better 
than 4 x MRF150 in power, but still very similar. I'd say with correct 
heatsinking and airflow, you could make a good 800-watt plus linear 
amplifier from one.  (From Tom W8JI)



with conventional output matching networks the third harmonic distortion is 
extremely high around -7 to -8 dB ( second harmonic is OK because of the 
push pull configuration of the PA)  Jacques F6BKI 
now retired but spend my working life with TRW , MOTOROLA and 
FREESCALE RF semiconductors 



John N4NU Thank you for your email. That old linear must have been fun.