6/14/2006 10:58:02 PMCarl Crabtree(39897:0)
I have an old Belden antenna That I would like to use with an old tube radio. The antenna uses two wires connected together and to the transmission cable at the coupler and both attached to the same pole at the other end.The short wire should form at least a 30 degree angle with the first(which requires an insulator and some additional wire).The coupler encloses a capacitor and a transformer (or inductor) which is defective. I need to know The purpose of these components and how to determine their values for replacement. Any help - anyone?
6/15/2006 3:03:59 PMThomas Dermody(39907:39897)
Don't know what anyone else has to offer. However, I have to think on this one....just to let you know that someone's thinking about it. I just lost my cat, and I stayed up until 5 in the morning looking for her, so it might be a while before my brain functions somewhat normally.
T.
6/15/2006 10:05:01 PMC Crabtree(39916:39907)
:Don't know what anyone else has to offer. However, I have to think on this one....just to let you know that someone's thinking about it. I just lost my cat, and I stayed up until 5 in the morning looking for her, so it might be a while before my brain functions somewhat normally.
:
:T.
6/15/2006 10:16:28 PMCarl Crabtree(39918:39916)
::Don't know what anyone else has to offer. However, I have to think on this one....just to let you know that someone's thinking about it. I just lost my cat, and I stayed up until 5 in the morning looking for her, so it might be a while before my brain functions somewhat normally.
::
::T Sorry for the double posting. The instruction sheet that came with the antenna had no technical or theoretical information so I don't know what the theory is behind the unusual configuration. two other bits of info: 1. info sheet says this system is shielded to reduce noise created by motors,etc. and: 2.no lightning arrestor is required with this antenna.
6/15/2006 11:08:48 PME. Centric(39919:39918)
Quite often an antenna has a certain impeadence depending on its' configuration. For example a dipole antenna will have a different impeadence than an inverted V antenna and a whip antenna will also have a different impeadence. I don't remember the actual impeadence values but you can look them up at the library in a ARRL manual if they have one. To obtain maximum transfer of signal or power the antenna impeadence must match the transmission line (often coax cable or flat line cable). The transmission line must also match the impedence of the radio or transmitter it is connected to. Most likely the components inside your antenna are some kind of matching network. These usually consist of some kind of transformer or inductor wound on a ferrite core and possibly some capacitors. I hope this helps. Young Mr Thomas, when his mind clears, will most likely have a more concise explination.
EGO
6/15/2006 11:11:16 PMThomas Dermody(39921:39919)
Yeah, right. We'll see. Still working on getting the cat. Have a cat carrier rigged with a clothes line so that I can yank it and close the door and retrieve the carrier at the same time. Can of tuna in back. She was there and then a big truck drove by. I might be up until 5 am to-day as well.
T.
:1 Young Mr Thomas, when his mind clears, will most likely have a more concise explination.
:EGO
6/15/2006 11:57:49 PMThomas Dermody(39922:39921)
Not that this has anything to do with radio, but success! Didn't happen the way I planned, but success none the less.
T.
6/16/2006 12:13:36 AMC. Crabtree(39923:39919)
:Quite often an antenna has a certain impeadence depending on its' configuration. For example a dipole antenna will have a different impeadence than an inverted V antenna and a whip antenna will also have a different impeadence. I don't remember the actual impeadence values but you can look them up at the library in a ARRL manual if they have one. To obtain maximum transfer of signal or power the antenna impeadence must match the transmission line (often coax cable or flat line cable). The transmission line must also match the impedence of the radio or transmitter it is connected to. Most likely the components inside your antenna are some kind of matching network. These usually consist of some kind of transformer or inductor wound on a ferrite core and possibly some capacitors. I hope this helps. Young Mr Thomas, when his mind clears, will most likely have a more concise explination.
:EGOThanks, it appears that this is an inverted V antenna. I'll spend some time at the library and see what I can find. As for the cat, I wouldn't spend a lot of time looking for it - Sonny James says the always come back.
6/16/2006 12:11:56 PMTD(39931:39923)
She came back.
6/19/2006 2:02:22 AMPeter Balazsy(39983:39931)
http://www.kididdles.com/mouseum/c020.html