All: We took Al's Double-Double mag loop: for a spin at FD. We ran 100W on 20M and 40M. First, we were surprised how well it performed for a "compromise" antenna. We worked 40M on Saturday and worked

We have not worked on the site, mainly because I was spending time on my FDIM talk and now our club hamfest is Saturday and Al and I are working on the book. One chapter is a different mag loop and co

The JackAl circuit has both audio and IF AGC, is Open Source, and designed for the µBITX. The manuals can be downloaded from QRP Guys. Anyone who wants to build it is free to do so. See attached. Jack

If the AM is domestic, the BCI filter I used works well. Here is the schematic: and the response plot: Insertion loss is small and I used axial inductors purchased from Tayda Electronics. I think the

All: I've been working with a small (2.4") TFT touch screen display for a CW messaging system. The display has 14 pins on the right edge of the display, with their ID's silk screened on the back side

Neither. Is a touch screen display and board that adds a bunch of features to the µBITX. Here's a copy of ours: Its features include: 5” or 7” TFT Touch Screen 800x480 TFT Color Display Dual VFO RIT S

You could move the interrupt header file into your project directory and use: #include "PinChangeInt.h" instead of #include <PinChangeInt.h> This will force the compiler to look in your project's dire

You're probably right, but as Allison pointed out, the radiation pattern varies with frequency and, quite honestly, I have little interest in 2M. We will be doing some experiments and readers can choo

"However taking peoples money with inaccurate or extravagant claims should not be a hobby, though it is often a vocation people pursue." Taking people's money? I'm not selling anything. My real goal i

Allison: I'm really only reporting the data that we had from the RBN reports. Your position seems to be that, because we didn't control all exogenous factors, the reports are meaningless...that no rep

Good grief, guys, this is a hobby for me. Allison, are you really trying to be helpful here, or simply showing that you have a lot of RF experience? Perhaps the best solution is to do no testing and s

If I were writing a treatise on mag loop antennas, I might worry about simultaneous transmissions and similar exogenous factors, but we're not. Chances are, we will do some simple tests using CW, SSB,

Alan: The results right now are modeled using the usual Pacific66 app. However, we do plan "real" tests in an attempt to get some useful data. Our reference antenna will likely be an 80-10M EFHW which

Is it portable? Jack, W8TEE

Right now, like most figures, those are the modeled values. We plan on doing our own field tests when we have the second version built. Jack, W8TEE

If you have an alternative model, we'd be interested in knowing about it. We are in the process of finding out which tests make sense and which are really little more than intellectual smoke. Truthful

Not true. Our loop is 40% efficient on 40M and 90% on 20M. See: Fw: [JackAl] W8TEE Mag Loop Testing Fw: [JackAl] W8TEE Mag Loop Testing Jack, W8TEE

We are also trying to assess other factors, too, such as a counterpoise and its affect on performance. We may find that these "other factors" play no significant role in the antenna's performance. Sti

I think I'm going to use a 6" piece of PVC pipe for mine. I have several air caps that would work and one VVC. I'll make the cap decision after we get some more testing done. Jack, W8TEE

Yep, we know about the HV issues. The cap is run by a NEMA 17 stepper which Al has geared down. The stepper controller goes to 1/32. We're still experimenting with timer interrupts to slow it even mor