[TowerTalk] Determining coax length?

[David Robbins]

well, you can probably get close enough by using the mechanical drawings for the antennas to get the length of coax along the boom to the boom-mast clamp then measure it from there.

any of the electronic measures will be less precise, but if you are careful and measure them all the same way you can probably get close enough if you just calculate the differences in length and not the absolute length.

Personally I prefer to cut all the feedlines the same length when populating a tower, this means that some of them are too long and end up coiled on the tower but it gives the best matching of the phases.

Nov 12, 2013 08:50:28 AM, rich at n7tr.com wrote:

I am stacking several mono banders with a stackmatch II. I have the antennas mounted on the towers, but the coax feedlines are different lengths right now. The Stackmatch wants coax lengths to both antennas to be the same length, but I'm unable to physically measure to the end of the feedpoints on the boom. All coax is the same (RF Davis Buryflex)

Questions:

1) How critical are the coax lengths to the stackmatch from each stacked antenna?
2) What tools can I use to determine the length of coax to each antenna? (AIM 4170, MFJ, etc?) and how do you determine equal lengths?

Thanks...
Rich

Rich N7TR
ex KI3V, N3AMK, WB3JOV
www.n7tr.com
http://www.qrz.com/db/N7TR
Telnet: dxc.n7tr.com N7TR DXCluster


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