Air wound Balun

Goodrat

DTVUSA Member
#1
I've seen a vid about making a balun with a pair of 14 awg around a plastic tube wired correctly etc..
If you work out the inductance of a rectangular coil and just wrap the pair around the 3 inch or so board you are building an antenna on, it may work fine as the balun.
Just connect the 75 ohm cable.
Thoughts?
 

Fringe Reception

Super Moderator, Chief Content Editor
Staff member
#2
Goodrat,

It might work well for an indoor antenna but used outdoors, your 'coil form' (tube) would tend to fill with water, snow or morning dew which would change its electrical characteristics.

I make my own waterproof frequency-specific coaxial loop baluns for my cut-to-channel Yagi antennas. I use RG-59 rather than RG-6 because some RG-59 will accept soldering and I have yet to find any RG-6 that will. The balun photo below was taken before it was waterproofed using silicone RTV. Other photos can be seen in my albums here on the Forum.

If you're interested in looking at an online coaxial balun designer, check out this link (and scroll down):

Martin E. Meserve - K7MEM - VHF/UHF Yagi Antenna Feed Design



Jim
 
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