yes, keep trimming until the swr is 1:1.0001 or less across all the
channels. anything higher than that will absolutely fry your transmitter
and cause you to go sterile because of all the reflected power leaking out
of your rig. electrical conduit is such a great conductor that it will help
the swr also by sucking all the power that would have been reflected back
out of the coax, i would recommend 17.22329 feet, plus or minus .00001, the
tolerance is very important, a hair too long and it won't reflect properly,
too short and it will act as a director and totally reverse the pattern.

"Blue Dawg" wrote in message
oups.com...
I am running a President Grant am/usb/lsb and on Channel 1 the SWR is
1:0.08, on Channel 40 it is 1:1.45 and on Channel 19 it is 1:1.09. It
really isn't worth doing an adjustment on this antenna setup is there?
The antenna is a single Yagi beam made up of two Tram Penetrators
(Monkey Made's). I think that it is sold as a 1/2 wave antenna and
have heard that it is a 5/8 wave. This antenna can be set for 10 meter
usage also. It really looks weird up there without a reflector on it.
I may put a reflector on it but am stumped as to length of the
reflector (ging to be made of 1/2" electrical conduit). I can't find
the formula for the length taking into consideration of the diameter of
the reflector. I believe that the 'stand-by' one should use 468/f.
Using 27.185 (Chl 19) the length should be 17.22 feet. Only thing is
the length of the driven element is less than 12' because of the
antennas having the centerload coil in them.

What do you think?