Ron, and all, I learned: Natural noise (lightning) is vertically polarized because lightning is a vertical event. I have seen lots of horizontal lightning, from cloud to cloud, or inside the same clo
Jim, a piece of advice to solve that tree climber problem: Get a drone! A good stabilized drone will get a fishing line exactly over the branch where you want it, and its FPV camera system allows you
Chris, I await the cores and wire patiently, I have a lot of practice in awaiting parts. Chilean customs is delaying everything by 2 to 3 months... in the meantime i am wondering if this transformer
Tom, I have tracked down a lot of man made RFI (mostly from grow light ballasts) and without exception the signal is vertically polarized until you get very close to the source. I found this very int
Cathy, and all, Yes, ham gear needs to be based on the RF PA equivalent of the 2N2222 and 2N3055; devices that have many uses, are fully mature, and won't be readily obsoleted by new tech. And why us
Bill, Don, It's just a matter of coming up with a clever layout that keeps phasing problems under control, then having the patience to solder all those parts, and there you are, with a legal-limit 2N
Roger, and all, I'm becoming attached to the idea that the word "linear" should be banned from the advertising Ham Amps, unless they (the seller) can show proof that the amp is truly linear, neglecti
Bill, A linear class C amp is quite a trick. Yes, it's tricky, but it can be done. Variable bias controlled by an error amplifying loop is one way to do it. REPLY: If you're varying the bias to make
Hi Chris, well, I'm glad that the transformer project was successful. I believe I am being a bit thick and probably not understanding how you intended the wires to appear off the bobbin. If I follow
Chris, Thanks for clarifying that, I have the 20 turn winding with the grounded end coming out on the side of the core with no terminal pins and joining the 8 turn winding on the side with the pins.
Jim, Not right. 61 is good for absorption in the UHF range, and for relatively low loss applications on HF. It works great as balun, for example in the form of an FT-240-61 core with 12 turns of RG40
Hi Jim, You are mistaken, Manfred. I've measured chokes like that wound on #61. They are NOT effective at MF or HF. #61 is FAR too high Q at HF. I understand that your point is that a high Q common m
Bill, As a technician who used to work at Tektronix, I can assure you that Can a digital scope do Lissajous figures? The ones I have used cannot. They simply don't have a horizontal input! My own wor
Hi all, thanks for the replies and suggestions. I will see if I can find a Tek 2465B on any of the local auction sites. Importing used goods to Chile has a bit troublesome, with extra high taxes and
Conrad, and all, keep in mind that the voltage rating of the capacitor is just one part of the whole thing. The other is its current rating. Once you have found out what's the highest RF voltage the
Hi Peter, The Russians doorknob capacitors do well. At least they look pretty robust. Do you happen to know the ratings? A quick look on the web showed very high voltage ratings, but I couldn't find
Hi all, I'm puzzled by seeing many low pass filter boards offered on eBay and elsewhere, that are rated for 1kW, 1.5kW and even more, with some sellers stating that their filters can work in CW witho
Hi Alan, Jim and all You've been quiet for a while. Yes, I have been building some stuff, so I was busy. I've mentioned a UK supplier before, Yes. I remembered the fact, but not the address... but fo
Hi John, Another source of high Q low ESR ceramic RF power chip capacitors besides American Technical Ceramics: http://www.passiveplus.com/index.php I haven't priced them, though, they look expensive
Roger, Obviously I'm missing something! Any ideas what? If I follow your story correctly, the noise appears only when there is actually some current flowing through the soft start circuitry. This poi