The QRPer Board

I want to use my 9:1 unun with my 20m QCX mini. What length wire recommendations? 9:1 ununs are typically used with random wire antennas, which are intentionally non-resonant. So, you would need a tuner to match the antenna to your QCX. An advantage of the random wire is its ability to be matched w...

Hi Matteo, The LiFePO4 batteries that I use have a built-in battery management system (BMS) to protect the battery. In addition to a low voltage cut-off (battery charge expended), they have a high current cut-off. If you draw more than the rated current, the BMS will shut down the battery. After pro...

K4RLC wrote: ↑Tue Aug 22, 2023 2:00 pm Hey Douglas - Vy nice key collection. What is the key that is 2nd from right, the one with orangish quadrants ? Interested in that one. TNX K4RLC Bob

The second key from the right is a BaMaTech TP-III. https://www.bamatech.net/morsetasten/ba ... y-rot.html

Mike, you're looking at it just from the point of view of "nasty effects during transmission", that isn't the only way, let me expand it; first of all there's nothing like "power levels" when it comes to common mode currents, the point is that a feedline (coax) should work as a ...

Brian, probably I oversimplified, what I mean is that one may like being able to jump on a non harmonically related band, so just by changing the EFHW length to a "good" one for a random and changing the tap to 9:1 we would then be able to jump on (say) the 30 meters band or whatever else...

Andrew - It should be possible to wind 9:1 & 49:1 transformance ratios on the same toroid, using different tap points. A few thoughts: First, if your ~66 ft radiator for 49:1 is tuned low in the CW range for 40m, it should be resonant on 20m, 15m, and 10m for CW. It would also likely be workable...

Hi Mike, The Tufteln 9:1 with 35 ft radiator is one of two antennas that live in my KX2 field kit. The other is a Packtenna 9:1 with a 71 ft radiator. I can tell you about my personal experience, but I claim no special knowledge. For context, I use this equipment for POTA activations, and I nearly a...

My timing isn't that great - my QCX-mini kit arrived last week! I'm hoping that Hans makes a high band (20-17-15-12-10) version too. When he presented the QMX at the Four Days in May (FDIM) conference, Hans specifically noted that he expects to put out a high band version of the QMX. He seems to ha...

Hello all, thanks for allowing me here, this is my first post. I operate a good bit of QRP from Meridian, MS and various POTA locations. I have a question...I recently purchased a QRPGuys EFHW kit and assembled it. When testing with my antenna analyzer, I had to trim the radiator even shorter than ...

Wondering if we can wake this thread up again? I see Thomas just posted a POTA activation with the G106 . While his full review is still pending, I get the sense he sees good value in the G106 (when paired with the digital adapter). Meanwhile the FX-4C is out from Yu, with at least a Facebook group...