[Antennas] Emergency 80 meter dipole - choke balun

[Steve Rodowicz]

Jim,

Scramble wind does affect the inductance.

See: http://www.k1ttt.net/technote/airbalun.html

For 75/80M I'd probably try about 16-20 turns with a 6" or 7" ID and check the 
reactance, aiming for 500 to 1,000 ohms minimum.

GL & 73,

Steve - N1SR


Jim Miller wrote:
> Quick - Going up tomorrow in some form - (today for those of you who aren't up late) - 
> 
> How many turns and how large for a 75 meter dipole at average of 35 ft using about 130 ft (not including choke balun) of RG213 and running full power.  
 > > Yes the feedline will be ON the ground running back mostly right under one 
leg.  Which leg is best???
> 
> 8 turns at 8 inches ???  Seems like that sticks in what's left up there but don't remember if that was for 80 or some other band (IF that even matters).  
> 
> Also - about the wrap, is it better to be pretty as if it is on a form or is scramble wound OK and does it affect the inductance?
> 
> Thanks es 73, de Jim KG0KP
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