Survivalism & Self Sufficiency Topics > Amateur Radio How-To's

Experimenting with a DIY VHF Dipole

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Greekman:
So.... Assuming that a dipole has an impedance of 75ohm, which turns to 50 when it is made into an inverted V,

why shouldn't one make an inverted-V VHF antenna and then turn it 90 degrees for vertical polarization?





measurements



Smurf Hunter:
Theoretically you should have a 1.5:1 balun between the dipole and coax. 

Also, I think as you get to higher frequencies, your dipole will be less broad banded, and its going to be difficult to get a low SWR across the entire 2 meter band.

We don't usually care about this on HF, both because of lower frequencies and we often have an auto tuner in line.

Greekman:
yes, i know.
but the goal is to improve on the dipole SWR which is expected to be 1.5. Workable but it doesn't hurt to waste less power

Carl:
add a couple more elements to the shield connected side and you have a ground plane....

Smurf Hunter:

--- Quote from: Carl on August 23, 2017, 05:21:26 PM ---add a couple more elements to the shield connected side and you have a ground plane....

--- End quote ---

If you have a half wave dipole, why should you also need the ground plane?

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