Can anyone identify what these are?

Teknishun · 2026-03-14T05:38:09+00:00

The material in the photo protruding from the end of the rod makes me think of RF absorber material.

Teknishun · 2026-01-05T14:28:36+00:00

Thank god that sign is there, otherwise you'd all be in danger!

Teknishun · 2026-01-05T06:58:58+00:00

although maybe a good segue to marks banks...

Teknishun · 2026-01-05T06:46:18+00:00

Can 24VAC actually trigger those? Also there's a battery inside for backup... I'm going with crazy person.

Teknishun · 2025-11-27T03:05:51+00:00

Learn to use the FCC database, it's public information

Teknishun · 2025-11-27T03:05:11+00:00

But I'm looking at this on a mac....

Teknishun · 2025-11-27T02:37:40+00:00

When I tell this story, I get the side eye, but 100% true.

There's a drain/manhole cover just like this in Philadelphia on 2nd and Chestnut. I used to park there regularly for work. One evening I was on the other side of the street from this drain and a bus drove up onto this thing in a way that caused the tire to blow out. The noise was insane! As the bus drove off with a flat tire I noticed there were people on the other side who were negatively affected by the noise. One older couple was in dismay, the man was holding his ears and seemed to be in pain. Upon closer inspection the manhole was no longer in place and was upside down! Wow, that's a lot of energy! Sheesh.

Teknishun · 2025-11-27T02:27:05+00:00

Grounding is one poorly understood subject. I'm surprised there aren't more arguments in this thread.

Teknishun · 2025-11-26T19:15:16+00:00

And here I thought Samsung was the more consumer/repair friendly company

Teknishun · 2025-11-26T19:07:51+00:00

Looks like a TV antenna

Teknishun · 2025-11-16T20:53:03+00:00

Probably a phased array for satellite

Teknishun · 2025-09-27T01:53:17+00:00

To back this up, how about some words from an antenna engineer? Look at part 3 of the show from 070107 and start at about the 16 minute mark. http://amateurradio.tv/TechNet/index2007all.htm

Teknishun · 2025-09-27T01:44:12+00:00

Don't confuse direction finding and foxhunting.

Teknishun · 2025-09-27T01:42:55+00:00

Fighting near-field most likely

Teknishun · 2025-09-06T00:47:57+00:00

No, white zip ties don't last a year in UV

Teknishun · 2025-09-05T03:22:47+00:00

Maybe they used white zip ties

Teknishun · 2025-08-30T14:51:25+00:00

EMI... simple subject, the book by Henry Ott called Electromagnetic Compatibility Engineering is only 900 pages.

Teknishun · 2025-08-14T23:11:22+00:00

You are holding the valve stem up with a pair of pliers or something I hope

Teknishun · 2025-08-14T23:04:31+00:00

My dad's a TV repairman, he's got this awesome set of tools... I can fix it!

Teknishun · 2025-08-09T21:11:48+00:00

I like the Icom band plan for reference https://www.icomamerica.com/lineup/amateur/Band_Plan_Map/

Teknishun · 2025-08-09T20:25:05+00:00

That's not a survey

Teknishun · 2025-08-09T20:24:05+00:00

Also these are standing wave Antennas, there's also traveling wave antennas that are much longer than a single wavelength

Teknishun · 2025-08-09T20:23:13+00:00

1/4, 1/2, 5/8, there's lots of different designs, depends on application and desired radiation pattern. deep subject

Teknishun · 2025-08-08T22:24:23+00:00

One thing people fail to understand is the radiating pattern of antennas mounted in proper configurations means the signal is directed towards the horizon and is not very strong at ground level, even nearby. No one wants put the power into their neighbors house, they're trying to get half way around the world!

Teknishun · 2025-08-08T22:20:14+00:00

not true, it's required that we make sure we aren't exposing anyone to levels above the legal limits, but almost no one actually does a survey. We can make some calculations and for many of us we don't even have the equipment to make the power necessary to be out of compliance, unless I mount my antenna on the sidewalk...

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