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Author Topic: Cushcraft AR2b ringo ranger swr and decoupling  (Read 2180 times)
N4AEQ
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Posts: 104




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« on: June 06, 2013, 03:18:28 PM »

 My AR2b ringo ranger has some unstable swr, I have seen older ringo rangers at hamfest that had a decoupling kit added, it looked liked a few feet of aluminum mast with ground plane radials at the bottom. I don't know how long the tube/sleeve needs to be? I know 2 meter radials are usually 19.5" long, do they need to be mounted on the antenna base, or if sleeve is needed then should it be 19.5" and radials mounted on the bottom end?
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WB2WIK
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Posts: 21836




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« Reply #1 on: June 06, 2013, 03:38:05 PM »

That new model is the ARX-2B.  The radials are 50-1/2" below the feedpoint and are connected to the feedpoint using a length of RG-213/U (or similar 50 Ohm coax) between the original SO-239 feepoint connector and a second bulkhead connector down where the radials are installed.  The mast alone will not suffice for this connection.

Complete construction details are on line: http://www.cushcraftamateur.com/pdffiles/ARX-2B.pdf



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N4AEQ
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« Reply #2 on: June 06, 2013, 03:48:09 PM »

  Strange, it looks like the 50.5" is long for any 2 meter multiple. The older models had a solid tube instead of using the coax shield, I didnt think they were quite that long but thanks to the link, I will give it a try.
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WB2WIK
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« Reply #3 on: June 07, 2013, 09:31:43 AM »

  Strange, it looks like the 50.5" is long for any 2 meter multiple. The older models had a solid tube instead of using the coax shield, I didnt think they were quite that long but thanks to the link, I will give it a try.

It's the correct length for the job it has to do; it's not a resonant length.
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