TV antenna adaptor

[T.T.]

My new VHF antenna has an adaptor with two short insulated wires at one end
and a screw-on attachment for the co-ax at the other end. The two wires are
meant to be connected to the arms of the antenna, using the wingnuts on the
antenna, and the co-ax is connected to the other end of the adaptor by a
screw-on device that grips the shielding of the co-ax with a threaded
cylinder and screws to the adaptor with a threaded hex-nut.

My question, before I caper around on the roof like a twenty-year-old, is
this: The resistance between the two wires, even without the co-ax or the
co-ax connector being connected, is zero. Unmeasurable. This cannot be
right? Can it?

 

[Phil Allison]

"T.T."

My new VHF antenna has an adaptor with two short insulated wires at one
end and a screw-on attachment for the co-ax at the other end. The two
wires are meant to be connected to the arms of the antenna, using the
wingnuts on the antenna, and the co-ax is connected to the other end of
the adaptor by a screw-on device that grips the shielding of the co-ax
with a threaded cylinder and screws to the adaptor with a threaded
hex-nut.

My question, before I caper around on the roof like a twenty-year-old, is
this: The resistance between the two wires, even without the co-ax or the
co-ax connector being connected, is zero. Unmeasurable. This cannot be
right? Can it?

** Yes it is right.

The tiny windings of small RF baluns have negligible DC resistance .

One needs pretty fancy RF test gear to measure the actual impedance in the
VHF or UHF bands.



......... Phil

 

[T.T.]

"T.T."


** Yes it is right.

The tiny windings of small RF baluns have negligible DC resistance .

One needs pretty fancy RF test gear to measure the actual impedance in the
VHF or UHF bands.



........ Phil

Thanks for that. I was checking to make sure that I had not shorted the
shield to the conductor, and confused myself no end..
Up onto the roof.

 

[Mark Harriss]

Thanks for that. I was checking to make sure that I had not shorted the
shield to the conductor, and confused myself no end..
Up onto the roof.

Don't forget to get the polarisation correct.

 

[Phil Allison]

"Mark Harriss"

Don't forget to get the polarisation correct.

** Yeah - or else you will have to wear polarising glasses when you
watch the telly.




............. Phil

 

[Mark Harriss]

"Mark Harriss"





** Yeah - or else you will have to wear polarising glasses when you
watch the telly.




............ Phil

Yeah you can get 3D with two antennas at different
polarisations and those coloured glasses.