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October 4th 09, 08:36 PM
posted to rec.radio.shortwave
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type/length of wire and connectors for external antenna?
"dave" wrote in message ... Wimpie wrote: On 2 oct, 20:13, JimK wrote: I'd like to try an external antenna, but one was not included with my G5. What type of wire should I get (stranded, solid, gauge, insulated...), and do I just solder it to the pos or neg lead of a miniplug to go into the ext antenna receptacle? Thanks.... Jim Hello Jim, Every type of metal wire will work for you situation (solid, stranded, plasticized galvanized washing line, etc). Most modern SW receivers with internal antennas are very sensitive, but cannot handle strong signals, so longer will not always be better. To reduce the interference from electronic equipment close to your SW receiver, you may put a coaxial cable between the actual antenna and the receiver. You can use any type of 75, 90 or 50 Ohms cable. The center conductor goes to the center pin of the mini plug and the bread goes to the ground of the mini plug. The antenna side of the cable needs some clarification. The antenna wire goes to the center conductor of the cable, the braid should be connected to ground outside your house (or at least far away from where you expect or have interference). What is "ground"? When you live in an apartment, it can be the metal fence or railing of the balcony. You can use a ground rod or any other large metallic structure outside your house. Connect the braid of the cable directly to the ground structure. Do not insert a long run of wire between the metal structure and the braid of the coaxial cable. For some form of static / impulse protection you may add a 1… 3 uH inductor between the center conductor and the braid. Note that this inductor will attenuate AM broadcast band reception. As others said, you have to experiment with the orientation of the wire to get best signal/noise ratio. When you are very limited in space for the wire, you may use some 5..10 feet of chicken mesh as reception antenna or use more wires in a fan shape. Best regards, Wim PA3DJS www.tetech.nl please remove abc when using PM. A couple clip leads on the whip helps sometimes. If you want to use a real antenna, you need a real radio. http://en.wikipedia.org/wiki/Communications_receiver That brought back some memories ! bmc |
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