[TowerTalk] Strange Balun...please help

[Herbert Schoenbohm]

I came into the possession of two unusual high power baluns, one with 
125' of RG-213 attached and the other with a two foot lead of coax 
attached.  They are seal and inside PVC with the coax going inside the 
bottom and large eyelets for the wire and support in the center. They 
appear to be commercially made.  I soon found tat they are not current 
baluns judging from the discovery that there is no DC continuity to 
either wire connection from the coax.  With a bridge and a 50 ohm 
non-inductive resistor the VSWR is very high.  However when I put a 1000 
ohm resistor on the antenna connections the balun is flat from 1.8 to 
past 60 Mhz.  This would make the device a 20:1 balun which is something 
I have never heard of. What kind of antenna requires such a high 
impedance feed?  If anyone has any knowledge of the use for these 
devices please let me know. Thanks


Herb, KV4FZ