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OCF Vertical Dipole for VHF/UHF: minimize SWR

Feb 18th 2016, 04:39

KE7RXD

Joined: Feb 28th 2008, 12:57
Total Topics: 0
Total Posts: 0
Looking to minimize SWR on a homebrew vertical dipole for 136-174 MHz and 400-490 MHz. With my current setup, SWR is off the charts.

I have horizontally isolated the dipole from its feedline by about 4 feet. The center of the dipole is 6-7 feet vertical from ground level. Yes, that is not very high, but I wanted to make the setup and takedown easy for non-hams to accomplish. That's one reason why I wanted a vertical dipole: no ground plane.

Questions: Will shortening one side of the vertical dipole, thereby converting the antenna to an OCF vertical dipole, lower SWR? Any other advice for an antenna newbie? Many thanks!

System components include:
Powerwerx DB-750X:
http://www.powerwerx.com/two-way-radios/mobile-radios/db-750x-dual-band-commercial-mobile.html

50 ft of RG8/U coax:
http://abrind.com/coax-guide/shop/low-loss-400uf-coax-cable-assemblies-pl259-connectors/25400f-pl-lmr400uf/

MFJ-347 dipole mount:
http://www.mfjenterprises.com/Product.php?productid=MFJ-347

Telescoping whips:
http://www.buddipole.com/stainsteelte.html

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