Batboard

Is there a weather proof Polyphaser with UHF connectors for outdoor mounting? Or, other brands.

Why does it have to be outside?

There is a good ground at the base of the tower and the desk top radio will be 100 feet from the tower.

Well, all the ones I've worked with, including the gas tubes, are rated for indoors. Drive in another ground rod near the cable entry to the building.

Or just stick it in a NEMA outdoor rated enclosure mounted on the tower with appropriate glands to have the cable run in/out.

Why in the heck do you want UHF connectors? And you do not know how to weather proof coax cable connectors?

arlojanis wrote:There is a good ground at the base of the tower and the desk top radio will be 100 feet from the tower.

Most radio installations make use of the length of the coax cable to help reduce the surge potential. Ground the shield of the coax at the tower and then again at the entrance to the building where the radio will be. Put the surge protector indoors where it belongs. Don't forget to ground the surge protector.

Ideally your ground at the building and the tower ground should be tied together. This way everything goes up and down at the same potential. Try taking a look at both Harris and Motorola grounding specs. There is some good information there.

There has been so many threads on radio site grounding on many internet sites, including this site. Do a search on the internet and enjoy the reading for the next month.

Jim

Here is a nice 518 PDF that is likely all you ever wanted to know about site grounding and more

I believe Motorola have uprevisioned their standards, but this is a good start

http://jeffcomm.com/XR56_2005_manual.pdf

Something else I would be concerned about by having a poly 100' from the building would be any voltage induced into the 100' of line on the protected side of the poly during a proximity strike much less a direct strike. You could clamp everything to ground in the poly during the strike only to have a huge induced voltage on the protected cable into your radio. That's why most shelters clamp this stuff at the bulkhead. Don't go cheap on grounding spend the bucks now or pay many times over for equipment repair or lawsuits when people get killed...

One site I worked at used Polyphasers inside of a stainless steel box. A bank of lightening arresters was mounted inside in a row, some with UHF and some with N connectors. Then each one was ground to a bus bar and that bar grounded to a copper ground ring around the tower. The stainless steel box had a Polyphaser sticker on it. So it may be in their inventory.