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Posted to rec.audio.tech
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Hi,
I have a C. Crane Witness radio. It came with a short wire FM antenna that plugs into the headphone jack. It doesn't receive that well, and I was wondering how to get a longer one. I've looked online and can't find one. The antenna has a little half length mini plug that doesn't cut the speakers out when you plug it in. I want to use this radio because it has a record feature. I was considering cutting off the end of the original antenna and splicing on another wire. I'm not sure what type of wire to use though. Can I use an old pair of ear bud wires? Does it have to be a special type of wire for an antenna? Thanks, itchy |
#2
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Posted to rec.audio.tech
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In article ,
inter naughtfull wrote: Hi, I have a C. Crane Witness radio. It came with a short wire FM antenna that plugs into the headphone jack. It doesn't receive that well, and I was wondering how to get a longer one. I've looked online and can't find one. The antenna has a little half length mini plug that doesn't cut the speakers out when you plug it in. I want to use this radio because it has a record feature. I was considering cutting off the end of the original antenna and splicing on another wire. I'm not sure what type of wire to use though. Can I use an old pair of ear bud wires? Does it have to be a special type of wire for an antenna? No, nothing special is required. You'll probably want to use a stranded-conductor wire rather than solid-conductor, so that it's flexible, but aside from that there's not much to say. Earbud wire would probably work, but this is often of a "tinsel" construction which is difficult to solder successfully. You can try using just a length of ordinary low-voltage "hookup" wire (22 or 24 gauge, PVC insulated). I suspect that the FM section in this sort of multi-function MP3 player is rather an afterthought... probably a single-chip AM/FM receiver. These are generally useful for listening to strong local stations under good-signal conditions, but aren't really designed for weak-signal ("DXing") use. A radio which is intended for serious FM listening is going to have a dedicated antenna input jack, usually with either a 75-ohm or 300-ohm impedance, which you can hook up to an antenna of the proper impedance... this helps provide good matching of the radio-frequency energy into the tuner front-end circuit. Table and portable radios usually don't have this, and the signal coupling from wire antenna to tuner circuitry is often rather hit-or-miss. As a result the radio doesn't get as much (or as clean) a signal as it might. |
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