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#5
April 10th 05, 02:48 AM
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Hal Rosser wrote: "Ken Bessler" wrote in message news:xHD5e.3395$up2.2389@okepread01... I just installed a Comet GP-6 and it's VHF low swr point is 139 mhz. I called Comet and they said there is no way to tune the antenna. I'd like to raise the 1:1 SWR point up to 146 mhz. The closest other antenna is an AEA 6m Halo 5' below the GP-6. The mast supporting both antennas is 30' high. I'm using non conductive guy ropes just below the halo. I remember there were discussions on this group about altering "percieved" SWR by changing feedline length. I'm using 30' of Flexi 4xl coax from the antenna to my secondary SWR bridge and a Radio Shack 2' rg58 patch cable from the bridge to the rig. I measured a 1:1 at the rig @ 139 mhz and 1.5:1 at the swr bridge (lowest swr seen there) but the low point on the bridge was 138 mhz. I was getting a SWR warning on my FT-857D around 152 mhz and adding a 3' RG-213 patch between the antenna and SWR bridge fixed that. So, which way do I go? Shorter or longer? Try Duct-Taping a piece of alum foil a few inches from the end of the driven element. or whack off an inch and see if the swr improves. Clip off a half inch first...'ya can't glue it back on if you took off too much! Butch KF5DE |
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