Not sure about anything but twin lead coming out of the wall. I'll have to ask some sightlings what's going up the wall outside. I'd be happy to find 75 ohm behind that plate where the twin lead connects internally.
On Thu, 3 Sep 2009, Tom Fowle wrote: > Transformers are very cheap, only a couple bucks. sometimes known as baluns. > If you have F type connectors on the wall plate, then you almost surely have > 75 ohm coax in the wall. There is almost surely a 300 to 75 ohm > transformer at the antenna. > > If you've not seen what is on the top end of the cable, having a look at the > antenna would be a good idea. Often the connections > to the transformer are broken or coroded, or elements are bent or feed wires > shorted. > On the other hand if you have twin lead comming out of the wall, then you > need a transformer between that and the input of any modern gear. > > Tom > > On Thu, Sep 03, 2009 at 03:53:27PM -0400, Spiro wrote: >> hmmm... transformer, expensive? >> Unless there is one in the wall, I don't know of any. I do not even know >> what the wire coming from the antenna is. It could be 75U, with twin lead >> in the house, or twin lead all the way from the stick down. >> Thoughts? >> >> >> >> >> >> On Thu, 3 Sep 2009, Tom Fowle wrote: >> >>> Spiro, >>> Not sure what you meant there, but amplifiers and the like as well as T.V. >>> and digital converter boxes all reequire 75 ohm coax. If you're >>> using twin lead and not including balun transformers to transform the >>> impetance >>> to 75 ohms, there's your problem >>> >>> We had to move our antennas to the attic because the new roof's >>> warranty would be invalidated by any antenna being mounted on it. >>> Using the home made antenna i detailed previously for some stations and >>> a big log periodic array for some others, >>> along with a 15 DB amplifier, it's marginal. >>> >>> I think the roof manufacturers are in colusion with the cable companies >>> to try to force us to get cable! <GRIN> Not having any! >>> >>> If the signals are in the noise, no amount of amplification is going to get >>> them out of the noise. >>> >>> Tom Fowle >>> >>> >
