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tmatini
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Join Date: Dec 2009
Posts: 1

TV Antenna Question

12/30/2009 5:32 AM

Dear Friend

As you know some kind of TV antenna rotate by a rotor .the rotor power is supplied by Main antenna wire (the wire that carry sound and image signals).I am looking for a circuit and description to make a board for this problem. How should you lead me?

It will be appreciated if you could direct me to a correct way

Thanks

Touradj
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Anonymous Poster
#1

Re: A little question bout tv antenna

12/30/2009 5:37 AM

http://www.dxzone.com/catalog/Manufacturers/Antenna_Rotators/
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redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15601
Good Answers: 981
#2

Re: TV Antenna Question

12/30/2009 9:48 AM

Every antenna rotor system I've worked on have separate cables for the RF signal (from the antenna) and for the antenna rotor.

__________________
 "Don't disturb my circles." translation of Archimedes last words
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kemavisjr
Member

Join Date: Aug 2008
Posts: 5
#3

Re: TV Antenna Question

12/30/2009 12:37 PM

It's called a diplexor or duplexor. Implies combining signals of different frequencies (HF AC and DC)

Basically one can pass DC through the coax center conductor and braid cables. A choke in the DC path strips off the rf so that the motor and controller won't get damaged. Then insert and take off AC signals by tapping in a capacitor (.1 - .001 depending on low freq cutoff) at each end of the DC path to run.

This does come at a cost of some signal strength.

Sorry about the lousey drawing. R= rotor, C= controller, tv= tv , cap and choke in drawing.

- untitled.bmp
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