Radio Tower Question, 2 Antenna's with 1 Hardline

[firemedic]

Ok, Been given a 2 1/4" Run of Hardline 290 Feet up a prime tower location. What pieces and or parts on each end do I need to run a VHF 150-174 range and a UHF 400-420 range antennas on the one run of coax? 100 watts on both ranges. No real chance of getting another decent run of hardline up the tower that large and for little to no cost. Got both antennas (Super station masters) to install and the repeaters ready to go. Just wondering if this was possible and if so what I needed to buy to make it all work right. Thanks for any assistance and help you can provide.

Keith L. Dobbins KC8RFW
Paramedic Firefighter
Communications Tech, Wood County Sheriff's Office
Parkersburg, WV 26104-1608

[batdude]

i am doing this right now on my 800ft site.


contact TX/RX systems.

you are after what they call a "CROSS BAND COUPLER"

you will need one of the tower mounted ones (weatherproofed) and one regular model.

expect to pay about $500 for the pair of them --- and if you tell them it's for ham radio, i believe it's 20% off list price....

here's the link:

http://www.txrx.com/demo/PDFs/crossband_coupler.pdf

looks like you will need one 80-05-06 and one 80-05-07

[nmfire10]

Yep. We are doing just that here with a VHF and UHF radio and a VHF and UHF antenna and one feedline. Well, it is "one antenna", a DB314, but it is basicly two antennas on one big mast. Cross band coupler in the radio room and another on the top of the tower. If I understand correctly you can more or less do anything you want within range on each side of the coupler. You can put a cominer on the UHF side of the coupler and hook 10 radios up to it if you want.

[SlimBob]

That's pretty impressive. Any "ham" equivalent would add about 1-2 dB of loss, which puts you back in 7/8th" category.

2" feedline... man, who specs for that? That's overkill unless you're going up 800-1500 feet...

[nmfire10]

Nothing is overkill when it is free or almost free