Home |
Search |
Today's Posts |
#8
|
|||
|
|||
Does anyone know of any AC (alternating current) 220V or 350V Shortwave Antenna circuits?
In article ,
Buck wrote: There used to be radio antennas that plugged into the wall outlets. They had a three pronged connector, but only one side was actually electrically connected, the other prongs were plastic. I am not sure what they did to isolate the electrical from the radio, but the antenna used the house wiring for an antenna extension. This may be what he is looking for, something that coupled with the electrical wires for a longer antenna. Ugh. Those things. "Turn your entire house into a gigantic television antenna!" These devices usually just couple one of the wires in the outlet to the antenna lead, using a small high-voltage capacitor. Component parts cost was a few cents, plus the cost of the plug, and (usually) some intricately-shaped plastic case meant to make the device look sophisticated. The case probably cost more than the guts, and the advertised price was far greater than either. From all I've heard, they generally gave poor performance for at least two reasons: - A house's power wiring is an excellent vehicle for RF noise and hash... harmonics from power-supply rectifier, broadband impulse noise from any AC motor with brushes, and so forth. Result: lots of static in the picture. - Multipath. The house wiring is of a complex shape, much larger than a typical TV antenna. The TV or radio signal is likely to be picked up by several different portions of the wiring, which will mix (with varying amounts of time delay) at the coupler. Result: a ghosty picture. To paraphrase a Monty Python sketch concerning a particular Australian table wine: "This is not a technology for using. This is a technology for laying down and avoiding." -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Inverted ground plane antenna: compared with normal GP and low dipole. | Antenna | |||
On Topic | Shortwave | |||
FS: sma-to-bnc custom fit rubber covered antenna adapter | Scanner | |||
QST Article: An Easy to Build, Dual-Band Collinear Antenna | Antenna | |||
I wonder... | Shortwave |