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receiver 75 ohm fm antenna connection
- Thread starter stu49
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Basically one of the screws should be the ground connection and the other the signal carrier. The ground can sometimes be identified by a clamp attached to it. If there is a clamp, peel back the foil shield braid on the coax and use the clamp over the braid to hold the cable in place, the signal carrying wire attaching to the other screw. If there is no clamp, strip enough braid to be able to twist it so that the ground screw can grab it. I'm assuming you're planning on using an antenna that has a 75ohm feed cable.
janikphoto
Lunatic Member
Just go to your local thrift store and dig through the bins for a few minutes. You'll probably find one and be done with it!
mhardy6647
Lunatic Member
or spend a somewhat remarkably high amount of money and get one of these - plug and play (and reputed to be quite good, even if one could build one's own for a buck or two)...
http://www.ccrane.com/antennas/fm-antennas/fm-reflect-antenna.aspx
It's plug and play (OK, screw and play) for 75 ohm "F" connectors.
http://www.ccrane.com/antennas/fm-antennas/fm-reflect-antenna.aspx
It's plug and play (OK, screw and play) for 75 ohm "F" connectors.
You can buy one ready-to-go with 300 ohm connectors on it from Parts Express for a couple of bucks.
Or you can make one yourself with some twinlead (or even speaker wire in a pinch). This would also use the 300 ohm connector on your receiver.
Even a cheap set of TV rabbit ears would probably work as well (also a 300 ohm connection).
Or you can make one yourself with some twinlead (or even speaker wire in a pinch). This would also use the 300 ohm connector on your receiver.
Even a cheap set of TV rabbit ears would probably work as well (also a 300 ohm connection).
Yes, you could cut the plug off and just connect the two wires to the 300 ohm connectors on the receiver.
In the case of the picture that you posted earlier, it's not really coax going into the connector (if it's like the one I have); it's just two conductor wire. And -- I don't think they even bother with any kind of balun inside the connector, I think one wire is connected to the center pin and the other is connected to the shield/ground.
Probably not; you're better off working with twinlead or even just 2 conductor wire as in the "make one yourself" link I posted above.
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cgutz
AK Member
I notice you indicated screw connections (posts?) rather than coax connector for the 75ohm antenna (might be marked "unbalanced" as well)? They look like the 300ohm connectors if I'm reading you correctly.
I bought a Denon amp with this type of 75ohm connector rather than a coaxial. I was frustrated trying to find a 75ohm antenna without a coax connector. Of course, the proper 300-75ohm balun could have been used. I could also cut the connector off the 75ohm rabbit ears and connect the center and sheilding strands to the posts.
I ended up making a 75ohm dipole antenna out of spare 22guage speaker wire (no I don't use it on my high fi, picked up a spool somewhere) using these directions: http://www.ehow.com/how_5798387_make-reception-fm-radio-receiver.html. I tuned the length of the wire separation to several NPR stations around 90.5 on the fm dial using this calculator (http://www.radiobrandy.com/dipole1.html).
What you end up is a "T" antenna similar to the 300ohm folded dipole ones, but doesn't have the balancing wire connecting across the top of the T.
This made for the best reception out of all the things I tried. I was able to use a length of lamp cord that could get the antenna up through the wall and across the topside of a rafter beam in my living room. The extra altitude probably contributes the reception.
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Yes, that's right. However they are not marked unbalanced.
I would have thought that the 300 ohm ribbon should have been set up in a T shape too. But not this one it seems. Hanging vertically seems to be the go.
Solved the reception problem and the tidiness problem in one fell swoop.
cheers
Stu
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This is a very good antenna, heavy gauge and well constructed. My SX-1250 gets this antenna while the $75 Terk sits in a drawer.
