thanks Jim for the info and advice.
Much appreciated.
Bob
K6UJ
On 9/3/16 11:34 AM, Jim Brown wrote:
On Sat,9/3/2016 9:50 AM, john@kk9a.com wrote:
I would not use LMR600 for the runs to the tower.
Also, always consider loss vs frequency when deciding how much to
spend on coax (or hard line) for a given run. For example, loss on
160M and 80M is quite low unless the run is VERY long. All of my "big"
stuff is working at 20M and above. One exception -- I have a "cobbled
together" run of 3-4 pieces of scrounged hard line and big coax
feeding a 350 ft run to a 40M wire dipole.
There are several internet resources that make this computation pretty
easy. The fanciest is SimSmith, a really nice Smith Chart program by
AE6TY. Free, runs in Java. Also, TL Details by AC6LA. And for even
more cool stuff, AC6LA's ZPlots, which is an Excel spreadsheet. All of
this stuff is FREE! And, of course, N6BV's TLW that comes on the CD
with the Antenna Book.
73, Jim K9YC
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