RadioBanter - View Single Post - Does anyone know of any AC (alternating current) 220V or 350V Shortwave Antenna circuits?

[email protected] · July 15th 06, 11:34 PM posted to rec.radio.amateur.antenna

wrote:
Dave wrote:
your request makes no sense... just what are you trying to do??

wrote in message
oups.com...
Hello,

Does anyone know of any AC (alternating current) 220V or 350V
Shortwave Antenna circuits? It is for use with a long vertical wire
antenna or TV antenna pole. I was wondering if anybody new of any
antenna circuits that meat this description.

Thank you,
Matthew William Coan
Sat Jul 15 15:48:04 EDT 2006

I am trying to make a powered shortwave antenna circuit for use with a
shortwave crystal radio. I wanted the circuit to use power directly
from the wall socket (AC 220V) so as to make a powerful and sensitive
antenna out of a TV antenna or just a long wire.

Thank You,
Matthew William Coan
Sat Jul 15 17:32:10 EDT 2006

Sounds like you need an active antenna. Try Google on active antenna
and see what you get. An active antenna uses transistors or I.C's to
amplify very short or poor antennas to increase the signal strength.
Active antennas can be powered from AC mains with an appropriate power
supply.

With a crystal radio, normally you don't need any active devices. If
signal boost is desired, you can do it on the RF end (active antenna),
or on the Audio side (audio amp).
Good Luck.
Gary N4AST