开云体育

Great idea - a French DIY audio company offers these for sale (not cheap): https://www.audiophonics.fr/en/voltage-regulator/ldovr-lt3045-lm31x-ultra-low-noise-voltage-regulator-33v-p-16198.html

Yeah. That’s where the “DUH” came from… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

I think that depends on the circumstances but yes the low noise parts make a much bigger difference. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator

Hi Bill Not sure how true this is but apparently LM317 style regulators are better than the LM7805's.?? Not as good as a dedicated low noise part though for sure. glenn vk3ep

These are great, Oliver. If it's okay with you, could you send me the hi-rez versions of the graphs? Al and I would like to include them in the book. BTW, I tweaked the toroids in the LPF board to

All: The final version of the code is about to be released by Al and I and we are turning it over to Oliver to care for it in the future. There are coding style differences that some people will

It's different for every different amp design... needs to be tested, BUT IN GENERAL you want enough headroom so that you never reach saturation of the devices... that means PTP power divided by four.

*** Does it have to be 1/4? How much improvement would 1/2 of available output give you? I recently saw a new LDMOS device that's rated for 2.5kW CW output. I think it runs off 75V. I was thinking

Easy to sacrifice gain to get negative feedback (and better linearity) when power isn't an issue and there is excess gain available (e.g. low power stages) Much more expensive and risky to add high

More mumbling about APP… operating the amp at less than 25% of its average available output gives better IMD. DUH. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

Well this is a load of crap. It’s a good way to cover the problems up… that’s all. Any RF engineer will tell you… stop it early in the design… not at the tailpipe. Dr. William J. Schmidt -

There’s that “Class-A” thing again… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner –

fyi Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton – J68HZ

I’m trying to get mine working and it appears the first step is to add the driver for the CYUSB chip to windows… but for some reason windows deactivates it and I can’t get past that. Do you know

yes !

Anyone here have a RX-888 MK-II SDR working? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch - K9ZC Staunton, Illinois Owner -

Gary, I’d like to see more here on this subject… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

I am seeing results like this using a Radioberry driving your 20W amp. Gary W9TD

Interesting… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton –

And these are not the kind of parts that even the most skilled builder would want to solder onto a board. If I ever do this, the boards will come pre-populated. They are 3mm x 3mm. YIKES! Dr. William