>As a matter of fact, in general, killing the current on the
outside of
>coax shields has fixed all kinds of wierd stuff around the
shack. From
>the above to the KW high isolation chokes on the input & output
of the
>AL1200, rf on coax shields is a real pain.
This should be no surprize to those who read carefully the W2DU
articles and also read the experiments conducted by W7EL and
reported in Antenna Compendium #1 dealing with measurements of RF
on the feedline.
I use a bead balun when I make measurements with my General Radio
1606 RF bridge. I have recorded differences between measurements
with and without the beads; the ones with the beads are closer to
expected values.
Tod Olson, K0TO
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|