Linear Amplifier
| Very preliminary information and pictures of JUMA PA1000 prototype. Last update 2012-01-06 OH7SV |
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- Output power
1000W pep - All HF bands + 50MHz - High gain - High efficiency - Drain voltage indicator - Drain current indicator - MOSFET case temperature indicator - Forward and reverse power indicator |
- Adjustable gain for 5W -
20W input power - Using single Freescale MOSFET MRFE6VP61K25H - Temperature controlled fan - Reverse power protection - Over current protection - Over temperature protection - Mains input 230VAC or 115VAC - Small size W260 x D300 x H135 mm, weight 14kg |
JUMA PA1000 front view |
JUMA PA1000 rear view |
Internal view |
The MOSFET and the output RF transformer |
Simple - no hassle construction |
Cooling aggregate on bottom side |
Another bottom view |
Mains transformers on the bottom of the enclosure |
Power supply and the amplifier on a single main PCB |
| Our intention is to make a kit of the
JUMA PA1000 linear amplifier. Feel free to comment and tell about your interest in JUMA PA1000. Update 2012-01-06 Please understand that this information
is published intentionally in a very early design
stage because there is very limited HF application information available
for the Freescale MRFE6VP61K25H. We have been working hard with the
broadband performance. In the broadband use the MRFE6VP61K25H LDMOS is under harder load compared
to a narrow band application. It might mean slightly reduced output power.
Additionally the 1.8MHz...50MHz coverage is rather demanding in a kilowatt
level. We are not sure yet if the 50MHz can be included in the design. We
might leave 50MHz out or specify it with reduced power
and/or efficiency. There are also some concept ideas e.g. more sophisticated
user
interface with auto band selection and lighter power supply. So be patient...
See also Juma Forum http://board.jumaradio.com JUMA designers 
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