(solved) Impedance of WD-36/T?

[brandon7861]

I am hoping to put up a GMRS repeater and need 100' transmission line. Thinking about twin lead, I remembered an old roll of telephone wire buried in the shed and I am wondering if anyone knows what its impedance is and what attenuation to expect. Has anyone used this stuff for UHF before?

Thanks

Edit: I adandoned the plan. The few loss charts I saw for twin lead suggest its terrible above VHF because of the dielectric and it probably wouldn't handle moving in the wind with how thin the wire is. Really bad idea.

 

[brandon7861]

I found a datasheet for it (MIL-C-55462), and although it does not list the characteristic impedance, it does say that the insulation is polyethylene and shows the dimensions. With .022" diameter wire and .017" separation (inside to inside), and a dielectric of 2.25, I get about 95Ω on an online calculator...

 

[nfsus]

Man I’m thinking about using some of this cable trunk line that’s laying around all over our area. 450mhz loss is not bad