Here's what not to do...

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EM36

EM36

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Sounds like a Larsen KGI series interior glass mount antenna:

KGI768

KGI825
THANKS! Thats exactly it. Never knew this existed. Next question is...how well do they work...especially when mounted over the darkened areas of front windshields. I removed one that was mounted directly next to the rear view mirror...
 

Bill_G

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Depends on the tinted glass. Vaporized copper tinting essentially turns a vehicle into a rolling Faraday cage. It tends to be darker with more of a black/brown cast to it rather than blue/green. Generally isn't used for a windshield because it would obscure night vision. We used to have a glass tester doodad at the shop the reportedly checked the loss through glass especially for rear windows with embedded defrost lines. It was a big deal during the early days of cell phones, and people had real mobile phones installed. By the end of the 90's people had moved to handhelds. Mobiles, and on glass antennas became dodo birds.

But, you still see them occasionally for LMR applications. You just have to limit how much power you use. People's brain skulls are in the field of fire.
 

kf8yk

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THANKS! Thats exactly it. Never knew this existed. Next question is...how well do they work...especially when mounted over the darkened areas of front windshields. I removed one that was mounted directly next to the rear view mirror...

The KGI is just a peel-n-stick center fed dipole, while it's promoted as one of Larsen's 'on glass' antennas it doesn't use any of the through the glass technology used on antennas with external elements.

I think you have some performance loss due to the horizontal mounting of the antenna elements resulting in horizontal polarization. The horizontal mounting also creates nulls off the end of the whips, between the nulls of a horizontal dipole and the effects of mounting the antenna inside the cab I'm sure your pattern is nowhere close to omnidirectional.

I also agree with Bill's comment on MPE, on the windshield this antenna is very close to the occupants. The antenna elements are painted black but are not protected by any other cover, with a higher powered mobile I'm not sure I would place an exposed antenna within arms reach of the user.
 
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EM36

EM36

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The KGI is just a peel-n-stick center fed dipole, while it's promoted as one of Larsen's 'on glass' antennas it doesn't use any of the through the glass technology used on antennas with external elements.

I think you have some performance loss due to the horizontal mounting of the antenna elements resulting in horizontal polarization. The horizontal mounting also creates nulls off the end of the whips, between the nulls of a horizontal dipole and the effects of mounting the antenna inside the cab I'm sure your pattern is nowhere close to omnidirectional.

I also agree with Bill's comment on MPE, on the windshield this antenna is very close to the occupants. The antenna elements are painted black but are not protected by any other cover, with a higher powered mobile I'm not sure I would place an exposed antenna within arms reach of the user
Pretty much what I figured tnx
 

RFI-EMI-GUY

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In the vein of what not to do (no pictures, sorry) - don't split 110VAC outlets to get 208VAC for your 48VDC charger.

So, you need 208/220VAC for your charger at a remote site, but there are no convenient outlets available, and for some reason you can't get an electrician there to plumb it in. What do you do? You go to Home Depot, buy two high quality standard 110 extension cords, cut off the ends, wire them into the charger, and then plug them into standard outlets that are on different legs of the service. Brilliant. You have 208VAC across the charger. Works great. Lasts a long time ... until someone decides they need one of the outlets, sees that the other half of the duplex for your first cord is open, and moves you over.

This is where you find out high quality those extension cords are, how big the breakers are, whether the smoke detectors work, and why fire suppression systems are advised.

There was no video in the shelter. I am sure hilarity ensued. But, the damage was enough to make me cut off my vacation last week to play janitor. Good times.

No, I was not involved with the original splitting the power across two outlets. That was done by the professionals at a large site construction group out of Florida that came highly recommended by MOT many, many years ago, and has gone unchanged despite my annual reports stating it needs to be corrected since 2014.

Neither was it I that moved the cord. That would be the ODOT tech installing a new rack of equipment that would depend upon the microwave backhaul powered by said charger (among other things). Not entirely his fault, but he was uninjured. And he kept his wits. He had to drop the mains to the panel to stop process because the plugs had welded to the outlet. And then manually open the contactor in the transfer switch. No discussion of brown transfer in his laundry.
In one of my homes, an alarm installer wired a relay to flash the exterior lights when the alarm would be set off. One night, we were out at dinner, the cat set off the motion detector and when we arrived home a couple of breakers were tripped and the alarm in trouble mode. The installer had used a leg of the main panel the was opposite the ones the lights were on. It had probably been wired that way from day one and never tested with the exterior light switch turned on. Thankfully nothing caught fire. I removed that feature permanently.
 

Bill_G

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In the vein of what not to do (no pictures, sorry) - don't split 110VAC outlets to get 208VAC for your 48VDC charger.

Moving at the lightning speed of government, eight days after I reported the original issue, today I will be escorting several maintenance managers and contract specialists to the site so they can view the charger and battery pile in question for themselves.

I'm not sure if I'm supposed to supply a buffet lunch or not. I've been too busy to find a caterer. Maybe some 7-Up, Cheetos, and teriyaki sticks will be okay.
 

Notarola

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Cold hotdogs are in order when dealing with government specialists they are used to suc..... you get the idea.
 

Bill_G

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