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I use that toroid website for approximating the length of wire needed.

My R-390(A) has a neon bulb across the antenna input, but of course it is only a receiver.? I have developed the habit of discharging any cable before connecting it to an instrument or radio; briefly

All: First, I posted this to multiple sites to tell you NOT to buy something. Let me explain. Al and I have been discussing our book and have planned changes for it to the extent that we are going to

I'm here just a bit preoccupied... The long and short of it is... It varies. Over voltage or over current are likely SWR related.? Assuming nominal constructions and tuning. High operating voltage

The only reason that the same questions get asked is maybe that they were not answered to where we understood the answer ? When someone answers that high SWR causes MOSFET failures, I need some more

Plenty on here, but pointless if no one listens. That's why there's barely a week guess by without the same old questions being asked. Gets boring after a while. -- - 73 de Andy -

Adam via groups.io <qrp-labs@...> wrote: An update, if someone's interested. Amplifiers arrived (switches still didn't -- I ordered them from a different seller, maybe they'll

For V/UHF antennas on military aircraft, we used a megohm or more to reduce the discharge. Those antennas used fiberglass radomes and not much could be used for grounding in the blades. We used

What about a pair of diodes or even a lamp of some sort? This has been done before. It's not rocket science. wrote:

Adding a megohm bleeder resister does seem like a good idea.? Wouldn't it need to go on the antenna somewhere, to keep any static dissipated before you go to connect the antenna connector to the

If this is likely, what value bleed resistor at the coax socket would remember better than we might ? Michael 2E0IHW

I'll add another thought to my earlier comment.? I've had no personal experience with it, but I've heard that an antenna can gradually pick up a static charge which can zap your finals at the instant

Thanks guys, I’ll use a common mode choke on feed line and?snap some toroids on key cable and see if that works. RichKQ9L

Rich, FWIW, I've had problems with my internal keyer also.? I've also added 6 ferrite beads to my keyer cable with some improvement but not yet complete success. RF feedback is a common problem

I had a similar problem and it appeared to be rf on the keyer cord. Some snap on toroids solved it for me. Rf from the tuner I expect.? 72, Bob KI0G

Joshua, Very interested in this topic.? I've had great success with the QDX and FT8 on 20m but am looking to branch out into other digital modes and remembered the fun of packet from many moons

Hi Hans! On QDX 80-20 more than 1000 QSO. But I would really like to have high-frequency bands. Can you share your plans for this project? -- 73, Oleh, I2/UY2ZA

I have not seen this particular problem but my QCX is much happier with a common mode choke. I use it with a random wire or a qrpguys tribander. My random wire uses a 49:1 unun and a common mode choke

Hi Guys, wondering if someone had this same experience and could share a solution. This am I was fortunate enough to have some time to go out and play POTA. I decided to use my QCX mini as I have

"I strongly recommend the LiFePO4 chemistry. It has great properties" I agree with that.? Great batteries. Light weight compared to lead acid, no need to charge regularly and very safe. They are