[Antennas] VSWR on Log Periodic.

George, W5YR [email protected]
Sat, 27 Apr 2002 08:46:01 -0500


Ditto - I ran the numbers quickly for 80 ft of 9913 at 30 MHz both from a
chart and from the equations and got less than 1 db total loss including
the negligible 2.2:1 mismatch loss.

Pat, that pencil needs sharpening!  <:}

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!
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Chris Adams wrote:
> 
> Pat,
> 
> I would suggest rechecking the calculations.  Running ARRL TLW, with a
> 2:1 SWR at load, 100' 9913 @ 28MHz I get the following results:
> 
> SWR @ input:   1.83:1
> Total line loss:  .797dB with the SWR responsible for 0.153dB
> 
> 73
> 
> chris, n4vi
> 
> Pat W wrote:
> 
> > My rough calculations show that with 80 feet of 9913,
> > an Swr at antenna of 2.1:1 has 5.9 dB of loss.
> >  The shack Swr shows 1.2:1
> >
> >   Pat W0OPW