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What i am about to suggest, i have not tried. I recommend testing it on a junk antenna first (ive tore all mine apart or i would).

What if, a quarter inch from the rolled edge of each section at...

welcome aboard!

Mylar doesn't stretch, id have to send it up partially empty. I think I'll stick with a normal balloon.

Air has a density of 0.001225g/cm^3
a 2:1 mixture of hydrogen and oxygen obtained from...

I don't plan to let it go much higher than a mile or two and would account for expansion. As for gas retention, I do not intend to have it deployed for any more than a few hours at a time, so whether...

I am interested in building a cross-band repeater deployed on a tethered weather balloon for emergency situations where local repeaters may be overwhelmed or non-functioning due to power loss. I plan...

Ok, I built it.

Forgive my mess of a desk. I didn't put the parts on a board as I didn't want to waste one of the few I had left on it so I built it into a ball of components with no board (hot...

If you are concerned with it falling off, try to make it fall off. If you can remove it, braze it back on. If force greater than what will be encountered driving down the road does not remove it, you...

Your confusion is likely due to that being a creation of my imagination. I highly doubt anyone has done that as grounding to the radio is usually sufficient (most rigs now that I think of it have...

So I started in on building an active filter just to see how easy it was to do this. Admittedly, I started with K4ICY's schematic http://www.k4icy.com/cwfilter.htm with the intention of replacing the...

To be completely honest with everyone here, I've NEVER grounded any of my radios :) I also run a 100w rig.

RF is a complicated beast. There are many reasons for grounding ranging from static...

I like that idea. What is plan? Are you going to use an active band pass filter centered around 700Hz using an op amp? At the 600 to 800Hz frequency of audible CW, I would guess that you can use a...

Agreed. I just had 19 teeth pulled and they didn't offer me as much as as aspirin. After I feel better, I will probably throw my name in that hat. Hopefully that task is taken on by a couple of us.

If the power supply is at least 25A, I'd recommend the Icom 718. I love mine and it loves my pyramid PS.(PS-26KX). That radio will run you about 600. Id also look at getting an antenna tuner,...

Without a single mod...

From what I understand, you want the mic or line input to go to both the program AND the headphone output. Have you turned on audio pass-through after installing pavucontrol?

Installing...

I forgot to add a photo. This site does not allow me enough space so here is a google drive link to the antenna. You will see why I removed the PVC shoulder once you take a look. This pic is without...

I like it. I envision something almost non-forum based but associated with this forum dedicated to the various topics. Many articles that start with "How ______ works" with the blanks being anything...

I appreciate the points you make very much. Perhaps my frustration got the best of me once again. I like what you suggest of a regulations section we can direct those issues to.

I suppose i have no idea how much junk is already filtered put by site mods. To those already working behind the scenes doing what they can, thank you!

I certainly have no issue helping people whenever I can, but it sure seems to me that the huge influx of direct-to-transmitting questions are from non-hams with little to no dedication toward...

Your question is best answered by pointing you toward research in radio wave propagation. From there, you will learn there is no single best frequency or antenna for reliable communication. Being...

I think you are spot on with 200:1. I recall sticking coat hanger wires in the top electrodes to make a jacobs ladder and the bottom had to be about half an inch to start it. That just about lines up...

I'll give that a try next time I build a beam!

Every single element of the beam (driven included) are scrap LPDA TV antenna elements "aluma-welded" to the beam. I used that low temp aluminum welding rod meant for MAPP gas torches to attach the...

The one I had the input of 120v was into the little box on the side and the high voltage was out the two insulated posts on top. Definitely no clicking on that beast, pure transformer action. No...