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Bill, I have a working V12 single transceiver.? My initial cable of 12" worked when it was on my bench but when I mounted in the encloser it quit working.? Not sure if that is long enough for a test

Good stuff! Thanks [email protected]> wrote:

Well, that’s 4 hours of my life I won’t get back. ? Rohde & Schwarz hade doing an online seminar ref EMC DEMC 2025 , obviously to sell their equipment, but normally some gems hidden.

T41 V11 operates in full duplex during transmit calibration.? So perhaps predistortion can be applied.? That would be an interesting experiment.? But V12 will not work, unless the TX calibration

Could be that John Melton worked on some of that… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

The new attenuator/ 20W dummy load I made can be used as just a 40db tap on the RF line for feedback for something like this (besides the radio calibration). I don’t think it’s that difficult to

Jerry, The Thetis software for the Hermes Lite, ANAN and radioberry radios has adaptive predistortion and you can examine the source files to see how it works. Thise radios have the capability of

On 2025-02-10 11:34, K9HZ wrote: In any > case, he does tout using class-A final RF amplifiers in the transmit > stages of radios because they, by shear design, will generate less > IMD. *** NO

For those who are interested…. Here is a tutorial on Class-A operation of transistor amplifiers: Class A Amplifier is a Class-A Transistor Amplifier

A couple comments on Rob’s talks… there are plenty more of them in addition to these. Rob has done a wonderful job of evaluating radio transceivers… I’ve been to his house/ lab and he has the

I have a couple of the 3.3V ONLY display boards prebuilt and I want a couple of volunteers to test them out. They have to be: 1) people with working radios, and 2) have displays that misbehave

Yes I have a couple hundred of the off-set boards. They are $0.50 plus shipping and can ship in a regular first class envelope for a couple of stamps. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ

Display freezes buttons and encoders stop working. Do you have some extra Audio Hat extender boards? I would like a few. Tim W4YN

Sorry Phil, I have no idea now. Never bothered keeping records. Should have as there seem to be muliple versions. I just ordered the 5" in the minimum configuration suggested on the group. Glenn vk3pe

*** I had to look that up. How can a big square have the same resistance as a little one? It's because as you add length - increasing the resistance - you also add width - decreasing it. - Jerry,

The resistance of a flat surface is called sheet resistance, measured in ohms per square. Not square inches or square cm, just per square. After that, it looks like things get complicated. The amount

Copper tape is one of the better ways to shield. Solderability is a feature you won’t get with aqua-dag or silver-dag, and these paintable solutions are quite costly, meant more for small areas with

Hey Tim… when you say it shuts down… what do you mean? The signal stops or the power goes off? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator

My bad I had left off Jumpers 18 and 19. I can now rx fine, but only for short period then it shuts down. Not up long enough to do RX calibration. Tim W4YN

** Yeah, the attenuation for the cheap carbon stuff doesn't look too good around 20M. I bought a roll of self-stick copper tape that claims that their adhesive is conductive. I figure I can put that