Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Rear window defroster/built-in AM/FM antenna = RFI  (Read 827 times)
KG6TAG
Member

Posts: 20




Ignore
« on: June 01, 2006, 10:35:15 PM »

Hi all,

Here's one that stumped me and my father in-law for several weeks.  It's licked now.  

My Saab has AM and FM receiving antenna built into the rear window.  For the car's FM (or was it AM?) radio, the antenna wires look just like defroster wires.  For AM (or is it FM?) the defroster wires double as an antenna, with a choke feeding the ground side of the heater coils.  

The problem I had was that these wires provided a perfect route into the car for my transmitted RF.  The solution was to put a big split-choke on the DC power lead which feeds the rear window defroster.  

More details in the elmers forum here:  http://www.eham.net/forums/Elmers/115677

So - moral of the story:
If your car uses the rear window defroster wires as an antenna and you are getting lots of RF into the car and can't figure out why, choke the defroster power line.

See you mobile


-Dave
AE6RQ
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!