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Very interesting - I never noticed but I think you are right. And actually it looks to me like the wires aren't going to the antenna wire at all. To get a closer look, I just pried my radioshark apart and looked at it. What do you think? I think his 2 wires are going to the outside terminals on the PCB that are not connected to anything. On my radioshark, there are 5 terminals there (these are labled "JP10" on the PCB) in this order:
Blank, AM, AM, FM, Blank
I think he's soldered to the two blank spots, but I'm not certain. I tested these with my multimeter but I can't determine where they go. Neither blank is connected to the PCB's ground. The two AM connections get resistance to ground, 1 with a little more resistance than the other (which makes sense since these are just wires going through the AM coil). But it appears from teh picture that he's got the outer blank connections connected to his jack.
I also tried following the wire visually in his picture (the one you posted above) and I say he's got the center of the connector attached to the wore that connects on the left side and the outside of his jack connected to the one on the right (the one next to "FM"), but that is really a guess since it is hard to tell by the picture.
I don't know how to do it, but I'd say we'll have to experiment with the FM connector and the two outer connectors, connecting the jack in different combinations hoping something will work. Please post if you come up with anything!
As far as using coax, I noticed that the antenna wire in my car was basically coax, so I was going to try to match it, although it probably doesn't matter. Maybe it isn't coax at all, but it feels like it!
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