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The S logo looks like Siliconix so I guess they are Vishay Siliconix parts: <https://www.vishay.com/docs/91015/sihf510.pdf> Mike N2MS

Just to add a data point to the discussion, here's an in situ picture of the FET from my v3 BITX40 from HFSigs.? Off the top of my head I do not remember where Ashhar said they sourced these from but

https://www.facebook.com/groups/172956609870876/ RF SSPA Builders - Facebook

Look at the schematics. Which CB amplifier is that? I would think to optimize the input and the output impedances of the amp (sorta of tuners), ferrites chokes at both the input and the output,

Hello everyone, Having a linear amplifier for 15 to 10m, how should I proceed to make it work from 80 to 10m? Obviously adapting the LPF, anything else? 73's py2pvb "the neophyte". Em qui., 15 de abr.

Doesn't apply to amps you make for yourself that are not sold to others. You still have to pass the third order harmonic reduction though. MRM

There is a restriction in Part 97 section 97.317 that does place a limitation of 15db gain on an external RF amplifier to receive FCC certification. However certification is only needed for an

Please pardon my ignorance, but is certification required if you build your own amp for personal use? Chris wrote:

https://www.law.cornell.edu/cfr/text/47/97.317

I never heard of such a limit imposed by FCC. They talk about maximum power output, frequency and signal purity. I don't think they care how the gain is distributed in the stages. Could you give a

What about the FCC 15db gain max for the amps? Il lun 12 apr 2021 01:06 AM John Cunliffe W7ZQ <n2nep@...> ha scritto:

Those might be NOS parts that were made when IR was still an independent company. According to a document on IR date codes I found ( http://www.irf.com/package/partmarking.pdf), the code on that

I have no idea if you have bad URF520's. What I know is that the only IRF510's that Mouser and Digikey have carried over the last 10 years or so have been Vishay/Siliconix. Jerry, KE7ER

Look on youtube for LDMOS. Build up to 11K by adding pills.

From the link, the image on the left is what I saw on the MPJA FETS; I guess I have some LF power FETs, then. Bob — KK5R

Bob, I have no idea if the MPJA FET's are legit. I do know that Mouser hasn't had anything but Vishay IRF510's?in the last 10 years. And that my Bitx40 and uBitx both have IRF510's with the Siliconix

To help eliminate the guesswork and speculation, I opened up the two packages of URF520's I got from MPJA and found ALL of them were marked IR (International Rectifier) with date code 9-18 (Sept 2018)

In junior high ( a few decades ago) we had to complete certain projects before we could work on what we wanted to. One was a simple metal chassis with three tube sockets mounted with various wires

Totally agree! Jack, W8TEE

Jack I have followed Dave's work for years, and have even built clones of some of his projects. Even with following his work precisely, my own results do not come close to his precision and