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Author Topic: Icom 760mkII AH-4 58 ft loop on RV  (Read 655 times)
N8BOA
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Posts: 90




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« on: January 28, 2004, 09:08:38 PM »

I installed a Horizonal 58 foot loop on top of my RV using 18" PVC standoffs and have found it to work exceptionly well with th AH-4. It tunes from 7.0 to 50 Mhz very well and for 3.0 Mhz I have a jumper that I open to give me a 50 foot end fed U. It will tune from 3.0 to 50 Mhz in the end fed U but my signal reports favor the loop configuration. Questions is it worth using 2" copper pipe instend of the 12ga wire?? What if i resonate the loop with a capacitor across the AH-4( Giant magnetic Loop)Huh could I get it to work from 1.8 to 50 Mhz. I Know if it works don't fix it..I once heard somtimes you must break it first to fix it. One more item the roof is metel and I have grounded to it as well as the frame... Thanks for your ideas

--...  ...-- /  .  ... / - -. -..-

Sean N8BOA
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K0BG
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Posts: 9839


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« Reply #1 on: January 29, 2004, 10:49:06 AM »

Forget the cap; you're already at the limits the AH-4 was designed to handle. Replacing the wire with pipe will slightly increase your bandwidth, but you probably will not notice the change. It'll be sturdier obviously.

As for the U configuration, I suspect the spacing has a negative effect on efficiency.

If you want to cover 75 (and maybe 160) is to add an inductor in the loop. The efficiency will be low, but all 75 meter mobile antennas are.

Alan, KØBG
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