开云体育

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

I am using the factory supplied 20cm(ish) leads. -- §97.313?? Transmitter power standards. (a) An amateur station must use the minimum transmitter power necessary to carry out the desired

Doug how long are your test leads? Really long leads can mess up the readings even if zeroed out.

Let us know how it goes. I bought one too but "maybe luckily" can't find it. I think I only paid $10.00 with free shipping. Jim WB4ILP [email protected]> wrote:

I don't see the feedback path to cause the crystal to oscillate. If Q2 is supposed to be a Colpitts oscillator, it is not correct and missing the feedback capacitors from base to emitter and

Yeah, I was thinking that it needed those "Collpits" caps.

Mike, I think there should be 2 caps in series from the base to ground with the midpoint tied to the emitter. Also, remove the .01uF cap from emitter to ground. I'll research the values for the 2