I would replace the entire length, then use the good section(s) for
other runs. Or keep as spare. The reason is that I like to avoid
unnecessary splices, which I view as another place the line can
accumulate moisture.
Of course, you use a sweeping antenna analyzer the produces complex data
and can export it. I would then make measurements of that line in the
shack, disconnected from the antenna, with the far end open, and again
with the far end shorted. Then export that data to AC6LA's excellent
Excel ZPlots spreadsheet, which will plot loss, Zo, and VF as a function
of frequency.
If you have access to an analyzer that can perform TDR sweeps to at
least 500 MHz (1 GHz better), you can see relatively small defects along
the line. I've done that with my VNWA. And you can do that without
disconnecting from the antenna!
73, Jim K9YC
On 3/24/2019 6:01 PM, Bob Shohet, KQ2M wrote:
So my question is – should I just replace the entire 325’ Buryflex feedline? Or does it make sense to replace the
the 100’ damaged area plus an additional “safety” area of ~ 50’ for a total of 150’?
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