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: FM Radio Interference  (Read 1040 times)
AB3CX
Member

Posts: 623




Ignore
« on: April 11, 2007, 12:46:24 PM »

My next door neighbor experiences some distortion on his FM radio when I operate on SSB, but not CW. This is at high power output levels only on HF bands 20 meters or shorter. His radio has an internal ferrite antenna and no provisions for an external antenna. It probably has no power transformer. In my own home, on a fairly cheap portable FM radio with a whip antenna, my wife cannot hear any interference at all. His radio is a boom box type unit, plastic case, probably not much shielding. I use a low pass filter. I'm making him a power line RF filter, but if this doesnt work, any suggestions?
Logged
WA1RNE
Member

Posts: 825




Ignore
« Reply #1 on: April 12, 2007, 12:38:31 PM »


  The line filter may work, as some FM portables without whip antennas loosely couple the front end to the line cord for use as an antenna.


 If your neighbor is connecting external speakers or line inputs that can be another way for RF to enter the radio. Those cables will need to be decoupled for RF with bypass capacitors and/or ferrite cores.

 
 ....WA1RNE
Logged
K7KBN
Member

Posts: 2788




Ignore
« Reply #2 on: April 13, 2007, 04:44:40 AM »

The only internal ferrite rod antennas I've ever seen are for AM radios.  Are you sure his FM receiver uses this kind of antenna?
Logged

73
Pat K7KBN
CWO4 USNR Ret.
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!