How to connect 75 ohm antenna to single wire antenna FM tuner

[dougduffett]

I have a dedicated roof top mounted fm antenna that has a 75 ohm coaxial type connector. Is there a way to connect my fm tuner that has a single wire antenna coming out of the backside to a coaxial cable and run it to the antenna?

 

[TLS Guy]

I have a dedicated roof top mounted fm antenna that has a 75 ohm coaxial type connector. Is there a way to connect my fm tuner that has a single wire antenna coming out of the backside to a coaxial cable and run it to the antenna?

No FM antennas are single wire. That must be the AM antenna you are looking at.

We need a picture of the back of your unit.

FM aerial inputs are either 75 ohm coax, or 200 Ohm screw type with two screws. A lot have both terminations. If you just have the 300 ohm then you can get a balun to convert from 75 to 200 ohm.

There is no one wire FM connection.

 

[highfigh]

No FM antennas are single wire. That must be the AM antenna you are looking at.

We need a picture of the back of your unit.

FM aerial inputs are either 75 ohm coax, or 200 Ohm screw type with two screws. A lot have both terminations. If you just have the 200 ohm then you can get a balun to convert from 75 to 200 ohm.

There is no one wire FM connection.

Yes, there is. Yamaha, Denon and most receivers are sent with a single wire FM antenna that fits the F-type fitting that SHOULD be used for coax. It's not a dipole, but it definitely is a single wire.

Anyone whose system is located far from a transmission point knows that a separate antenna is needed and at least the manufacturers stopped using that POS fitting without threads, which accepted a coax with F81 barrel coupler.

For those of us who live close to antenna farms, any antenna is too much and reception is usually terrible. When I was using my Denon, I found that a balun with a wire tie from a loaf of bread was about right for most stations but only if I only had one end attached. My noise to signal ratio dictated this and my old Sony receiver has a multipath button that uses the signal strength meter to show this andhere, it shows low signal strength but the MP is pegged on many stations.

 

[TLS Guy]

Yes, there is. Yamaha, Denon and most receivers are sent with a single wire FM antenna that fits the F-type fitting that SHOULD be used for coax. It's not a dipole, but it definitely is a single wire.

Anyone whose system is located far from a transmission point knows that a separate antenna is needed and at least the manufacturers stopped using that POS fitting without threads, which accepted a coax with F81 barrel coupler.

For those of us who live close to antenna farms, any antenna is too much and reception is usually terrible. When I was using my Denon, I found that a balun with a wire tie from a loaf of bread was about right for most stations but only if I only had one end attached. My noise to signal ratio dictated this and my old Sony receiver has a multipath button that uses the signal strength meter to show this andhere, it shows low signal strength but the MP is pegged on many stations.

Well I never say that single wire in my life.

Never had a tuner have trouble with too much signal either.

 

[highfigh]

Well I never say that single wire in my life.

Never had a tuner have trouble with too much signal either.

Having sold and installed many systems, I was very annoyed when I began to see a slide-on antenna with a smooth metal sleeve- I think Sony were the first and others followed until they fond that being able to slide the connector over a threaded F-type terminal was better and it allowed using a rooftop/attic-mounted antenna with coax. Dipoles work OK when the signal is adequate, but when multipath is stronger than the direct signal AND the tuner has inadequate alternate channel selectivity, it's time to forget about clear reception and that's what I have here- as I wrote, I'm very close to an antenna farm and that's not good for someone who likes to listen to a college station that's weaker than all of the others. Since I'm no longer using an AVR, I may look for a decent tuner, but I doubt it would be worth the money spent, unless I find a classic AND wind up living in a place where good radio stations exist (not likely, IMO).

Here's a photo of the kind I'm referring to. It's possible that some are two wires, but many aren't and I have seen several that had been cut.

http://s.ecrater.com/stores/212824/52aebdbd67bd9_212824b.jpg

 

[TLS Guy]

Having sold and installed many systems, I was very annoyed when I began to see a slide-on antenna with a smooth metal sleeve- I think Sony were the first and others followed until they fond that being able to slide the connector over a threaded F-type terminal was better and it allowed using a rooftop/attic-mounted antenna with coax. Dipoles work OK when the signal is adequate, but when multipath is stronger than the direct signal AND the tuner has inadequate alternate channel selectivity, it's time to forget about clear reception and that's what I have here- as I wrote, I'm very close to an antenna farm and that's not good for someone who likes to listen to a college station that's weaker than all of the others. Since I'm no longer using an AVR, I may look for a decent tuner, but I doubt it would be worth the money spent, unless I find a classic AND wind up living in a place where good radio stations exist (not likely, IMO).

Here's a photo of the kind I'm referring to. It's possible that some are two wires, but many aren't and I have seen several that had been cut.

http://s.ecrater.com/stores/212824/52aebdbd67bd9_212824b.jpg

There are lots of good vintage FM tuners on eBay.

However I do note your Public radio service is very limited compared to what we enjoy. However you can stream Minnesota Public radio and the BBC. That pretty much has you covered.

Getting back to the original post it seems impossible to help the OP. I have been on some FM forums and this question is asked. There seems no easy solution. You have to trace the circuit to see how the single wire is contrived. It seems most often internal modification is required to use an external 75 ohm antenna.

I think the OP is best advised to get a unit with a 75 ohm F-Type connector.

 

[Speedskater]

This tuner must use it's own chassis as a counterpoise. Think of a counterpoise as an artificial ground. Don't know it you can connect the coax shield to the tuner chassis or not.