I was thinking about how the original post was about not having L and C labelled on the tuner, and translating knowledge of L and C in the tuner into "what's going on" (i'm wrestling with the pi netw
It's always interesting to read patents, as it gives you insight into how a designer perceives the customer problem to be solved..it can give insight into the "whole" problem the designer is wrestlin
thanks steve. Interesting. AH! real data? so for 160/80, Q increases for more turns (more uH). But the higher frequencies are more complicated. (note the arrl article's simulated numbers used fixed Q
Dave K4JRB "I use a Ten Tec tuner and it handles 80 to 10 OK but if the 160 antenna is above 3 to 1 or 1 to 3 I usually add a big transmitting mica on the rear to ground to make a good match." so thi
Steve G3TXQ said "If you want to get meaningful loss results with that simulator, be prepared to manually change the default Q value as you change bands and change inductance values." Yes, if you wan
Are you saying that after you found the settings thru other means, that the MFJ still reads 1.8:1 on the settings for 80/40/20/15/10 ? maybe report what your read for each band with the MFJ, on your
"Quiescent current (bias) in the RF amplifier section is adjustable. This adjustment directly affects output signal harmonic content. Harmonics are worse with low supply voltages, and with low impeda
Funny timing. I've been playing with a M2 40M 2L conversion. last year I had expanded it to a full size 2L with bent tips vertically, but just changed that last weekend to a Moxon. Still testing thin
4nec2 includes the nec2 output file with numbers if you want them. I use File/Save Nec output file, then look at the file (after a calculate) If you specify the voltage magnitude correctly on your in
How can one rationally argue against skimmers, while allowing spotting networks? it's like saying "well, spotting is okay, as long as it's not so good, or it comes from humans who asserts that he hea
Jim's response makes sense. I figure contest organizers should set whatever rules they like. If people like the rules, the contest will thrive, if not it won't. I can't get this "lay down the law att
I think the best is the aluminum crimp sleeves. Mechanically and electrically sound, and lots of surface area. If you're going Al to Cu, I would think for our purposes waterproofing the whole think w
Here's a 80m dipole I'm going to put up. Thought I'd see if I overlooked something someone might comment on.https://sites.google.com/site/knormoyle/ It uses a close-spaced open-sleeve parasitic to br
Hi, thanks for the comment In the antenna I described, the antenna is ordinary wire, and the feed is ordinary coax. I'm planning on RG-6 actually (copper shield). The antenna I described doesn't have
okay Rick, thanks for the clarification. I guess what I'm thinking is that there is no single LC match, even with two wires that gives equivalent bandwidth. Things that I'm ruling out: switching the
<I'm going to look at the arrl articles Rick listed> Jim asked "When you say open sleeve, do you basically mean something where the apparent diameter of the conductor is larger (e.g. like cage dipole
I read the papers N6RK mentioned, and think i understand what they're saying about matching and losses. KU7G's article in the July, 1984 QST "Limitations to Broadband Impedance Matching" ends with "T
here's a guy who actually built a rotator with a digital magnetic compass sensor for direction http://www.kg4jjh.com/arc.html "The Antenna Rotator Controller is unique in that it senses, displays, an
If you want to make some estimates: I used this paper before to make some rough guesses at thermal dissipation for enclosed electronics http://www.hoffmanonline.com/stream_document.aspx?rRID=233311&p
I had a X7 I assembled in 2004. There was a missing part and I sent email to them and they sent the part. I looked in my email, because I remember noticing something like you say. The actual ES part