Re: IRF510 amplifier failures
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I don’t think it’s so much a matter of if they will work or not. Both will work fine at 50 MHz (and above actually)… the issue is that the RD15HVF1 is a little flatter across the spectrum and from that perspective easier to design around and match. I use them all the time and they are very easy parts to make work. A pair will easily put out 30 watts 1-54 MHz if the rest of the design is correct.
I’ve been thinking about and have had requests for a nice linear amplifier for the uBITx and these parts are cheap enough to use for that purpose too. I originally designed one using two RD70HVF1 parts but the cheapest I’ve found them is $18 each. Not a show stopper but the little brothers are cheaper. If The parts were under $15 in large quantity, it would be a no brainer. The auto tuner must be finished first though. Oh, did I mention, the RD series devices are real RF transistors?
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From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Lawrence Galea
I was thinking about the RD15HVF1 so that it would be easier for people who want to try 50MHz and perhaps 70MHs where available with suitable mods to the μbitx.
The RD16HHF1 appears to be used in the Ukraine transverters as a PA in the 50MHz, 70MHz and 144 MHz transverters while the RD15HBF1 appears to be used in the 222MHz and 432MHz transverters. http://transverters-store.com/50mhz.htm
I have the 50MHz and 70MHz transverters and they do work.
Last year I built a 5 element LFA Yagi for 70MHz but didn't have time to get on the air.
Lots of data at http://www.g0ksc.co.uk/intro-lfa.html
On Sat, Jan 27, 2018 at 3:41 AM, James Lawrie <lawriejk@...> wrote: