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That's interesting Nick. He even acknowledges the small amount of extra capacitance that this technique introduces, between the pads and the board. Dave AA7EE

For the folks who built the soldersmoke dc receiver, which pto coil form did you print? I have some cycles on a nice 3d printer so I'd like to make one. Thanks! 73 Mike M Ku4qo >

I went down the alternate road a while back and found QucsStudio (uSimmics). https://qucsstudio.de/ The neat part is the tunable parameters section, change your L&C's on the fly with the sliders and

I think I mentioned in the video that the Mac and the Windows version of LTspice are very different when it comes to the user interface. I am a Mac user as well, but I miss some of the features that

I thought of this thread when I found something in my notes headed "Birth of Manhattan Style?". It was in reference to a QST article of May? 1972 called "Some 2-meter solid-state RF power amplifier

Wow, great issue. I was going to try to track down that legendary keyer but you saved me the trouble. I'd recently been researching early keyer designs while I was engaged in my Accu-Keyer project,

Tumbling down the digi-key internet rabbit hole - I came across the April 1968 edition of QST which featured the digi-key keyer.?

Digi-Key's first product was a digitial CW keyer: https://www.digikey.com/en/resources/ham-radio/ham-radio.

Karl, Thanks for sharing you video. I looked at Spice many years ago and found it too confusing. Your video inspired me to take another look, so I downloaded the LT to my Mac. When I started and

Nick, The problems I was having were, as I mentioned, getting LT Spice to "properly" display/plotting of a filter. Ironically,? the video that Karl made directly addressed the LPF I was working on.

Gang, 1.? First of all you are going to need something like the following RF probe to measure the output of the f_T tester we have been discussing in previous posts. There are a lot of RF probes

Gang, The QRPBuilder magnetically attached Iambic and Single lever Paddles are now back in stock. Also, this will be our fifth year at the Dayton FDIM vendor night on Thursday May 15, with all our

Nice piece this morning on NPR regarding Digi-Key. https://www.npr.org/2025/04/24/nx-s1-5332209/digikey-tariff-small-minnesota-town-big-company I didn't know it was started by a ham

Thanks Stephen.? Doug posting that article yesterday is what got me leaning toward fix it and keep it.? Seeing it again has pushed me 99% over the fence.

Thanks Mike.? Do you remember what you replaced L1 with?? The more I read it looks like the less the value matters.? I now have a folder full of different cal routines and will probably try them

Here is an article on how to improve the LC100A. https://ludens.cl/Electron/LC100A/LC100A.html [email protected]> wrote:

Doug, I bought one of these about 5 years ago. I replaced the L1 toroid immediately and got reasonable results. I can tell you that a big improvement came by using a rather convoluted calibration

Hi William, I am glad my video helped a bit. I am no expert in LTSpice, I use it as a tool (just like I don’t need to know the metallurgical ins and outs of building a hammer in order to use it ;)

What a deal! That must have been fun, going through all the parts when you got home. Dave AA7EE

Karl and Nick, It was I who dropped the original post asking about alternatives to LT Spice. Because I don't like to clutter up the threads, if someone does not respond after a day or two, I drop the