With first generation SS amps, auto tune was almost a necessity, BUT with the new amps? With the current flock of transistors that can handle the wrong antenna or even an open circuit, auto tune is j
With first generation SS amps, auto tune was almost a necessity, BUT with the new amps? With the current flock of transistors that can handle the wrong antenna or even an open circuit, auto tune is j
everything else thats involved with the SS amp. Yep, that's it in two sentences. That's why I can't get excited about cheap SS finals until I see a complete, commercialized SS amp using them, said am
I agree with the spot-on-the-mark sentiment summary expressed below. A very fine QRO legal-limit S.S. amp with decent IMD specs can be homebrewed by the savvy hands-on experimentally inclined (not ma
I respectfully disagree - unless one demands only a full-legal amp. SB-200's (and many similar power-level amps) sold like crazy in the past & are still being resold daily. A 600w SS amp is not expen
Yes, fully agree David; if we bifurcate the S.S. amp design and build endeavour to less than 600 Watt PEP, and no time limit 1.5 kW, then it's an entirely different ballgame whereby things become ver
I clearly do not fit the criteria of " savvy hands-on experimentally inclined" but I have built two SS Amps and used them exclusively at my contest station (8P5A) for the last two years. I have tried
Another option to rolling your own higher power SS amp is to combine commercial amps. As W2SC has noted, combiners/splitters are simple and reliable. I have two KPA500s running in parallel, which whi
Roger, Tom, and all, I can't help giving my 5 cents (or whatever) on this... With first generation SS amps, auto tune was almost a necessity, BUT with the new amps? It totally depends. If you only op
Manfred Thank you for the thoughtful responses. They triggered some ideas for my next version and very valuable. I will defer the questions on feedback and IMD improvement to someone with more design
Gentlemen, The real issue here in respect of this excellent discussion about diplexer termination of harmonic energy is the profound impact on IMD and linearity. These MOSFET and LDMOS RF power devic
I think Manfred has a point - where the harmonics aren't going into a load and are being 'reflected' by the harmonic filter, I think the phase between fundamental and harmonics matters. The right rel
What might it cost of someone made and sold a filter like this? For a homebrew driver source, variously rated 10w, 120w, and for an amp 600w and 1200/1500w? http://www.qsl.net/wm5z/qex199907.pdf 73,
What might it cost of someone made and sold a filter like this? For a homebrew driver source, variously rated 10w, 120w, and for an amp 600w and 1200/1500w? http://www.qsl.net/wm5z/qex199907.pdf 73,
http://eb104.ru/internet-magazin/lpf-filtra-dlya-shpu/lpf1000w-fnch-diplekser-1000-vt/lpf-filtr I have two of these. They have not been trouble free, but part has been my fault. They have been reliab
To me, an amp is an amp, is an amp be it tube or SS and its sole purpose is to give me a louder, clean signal. When I initially tune up a tube amp it's into a dummy load. On 160, 74 and 40, excursion
Again, I don't think so. These new devices don't need much in the way of protection, just something to limit the drive and monitor temp. A built in SWR meter would be handy, but not a necessity. IOW,
I think the ARF15XX line has 300 V devices.at the kW level involved, the output impedance is disgustingly close to 50 ohms. Actually when designing for high VWSR operation, you have to take into cons
Alex, I think the ARF15XX line has 300 V devices.at the kW level involved, the output impedance is disgustingly close to 50 ohms. Do you mean to say "delightfully close"? I would see it that way - if