The K3's receiver antenna in connector is a BNC connector.
You might find an adapter at Radio Shack. You don't need a gold-plated one for this application, but Radio Shack part # 278-303 is a gold BNC to RCA phono adapter. You could fasten that to the K3's back panel and plug an RCA male-to-male connector between your K9AY loop box and this adapter. I have a surplus place in my town that has many odds and ends of cables with various connectors. I'd rummage around one of those places if you have one in your neighborhood. I search around using "male BNC female RCA adapter" as the search argument and found a fair number of hits. I've never shopped at these places, though. http://www.l-com.com/item.aspx?id=5435 http://www.smarthome.com/7809RB1/BNC-Male-to-RCA-Female-Adapter-2127/p.aspx http://www.shopwiki.com/search/RCA+Female+to+BNC+Male+Adapter http://www.trianglecables.com/200-173.html If you look around you may even find a cable of the appropriate length for your situation that has a male RCA connector on one end for the K9AY loop box and a male BNC on the other for the K3 receive antenna. Or as you say, you can make up a cable. If you're making up your own cable, there are instructions on installing BNC connectors in the ARRL handbook. GL & 73 de Dick, K6KR From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe Hoffman Sent: Tuesday, December 30, 2008 12:32 PM To: elecraft@mailman.qth.net Subject: [Elecraft] Receive antenna connection I have a K9AY receive loop to connect to my K3. The K9AY box needs a RCA phono plug. I'm afraid I don't recognize what the plug is on the KXV3 aux. antenna board. Can someone tell me what it is (maybe a BNC)? Does anyone know a source of a phono to the mystery connector cable? if not, where can I find the mystery connector? Then I can make a cable. 73, Joe K3 S/N 1713
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