[Antennas] G5RV resistance question

[George, W5YR]

Bob, do you mean that the twinlead to coax connection is the location for a
balun? The actual connection of the two lines does not perform a balun
function . . . rather it is that connection that produces common-mode
current on the coax outer braid in the absence of a balun. Coiling the coax
at that point will help or inserting a W2DU bead balun or any good 1:1
current balun will minimize CM current.

A better solution is to avoid the coax altogether and bring the twinlead
all the way from the antenna to the tuner, which is needed anyway on most
bands other than 20 meters. That is the configuration that G5RV recommended
. . .

His basic design using an electrical half-wave section of twinlead merely
allowed him to convert to coax feed some 30-35 feet away from the feedpoint
rather than having to support the heavier coax from the center of the
antenna. There was no intent for the line section to have any magic
impedance matching properties on 20 or any other band. It also allowed him
to use 30-35 ft less of expensive coax back in postwar England when he
devised this antenna at the end of WW2 to (a) cover 20 meters with a little
gain and (b) fit into his available space.

73/72/oo, George W5YR - the Yellow Rose of Texas         
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe   
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121  Kachina 505 DSP  #91900556  Icom IC-765 #02437


Bob Wilder wrote:
> 
> First off, that was not a balun, but nothing more than a convenient
> insulator for connecting the coax to the twin lead. The actual "balun" in
> the G5RV is the twin lead to coax connection.