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: Wierd digital signal on 3.900 Mhz  (Read 6042 times)
AD5TD
Member

Posts: 113




Ignore
« on: August 08, 2013, 06:18:27 PM »

Has anyone heard it?   It is on when I tune in to my regular group at 6:30 am and lasts until I get to work at 7:30am. Some of the guys have tried to decode it, but It's not any of the common digital modes.

Thanks,

Bill
Logged
K0OD
Member

Posts: 2559




Ignore
« Reply #1 on: August 10, 2013, 04:40:21 AM »

You're providing almost no info.

For starters, where are you located? Are the other members of your "regular group" local or scattered around the country? Have you bothered to listen at other times? On weekends? If you can hear it midday, then it's very near.

"lasts until I get to work at 7:30am" Does that mean it shuts down at 7:30 or you don't know whether it continues, perhaps all day?
Logged
KD0REQ
Member

Posts: 981




Ignore
« Reply #2 on: August 14, 2013, 10:13:38 AM »

3.900 is a moderately common crystal frequency for microprocessor controllers.  could be any appliance, and most are exempted from FCC rules.  could be a video game.  start flipping breakers for starters.
Logged
W2WDX
Member

Posts: 188




Ignore
« Reply #3 on: September 22, 2013, 12:37:18 PM »

Most likely a neighbor just bought a Plasma TV. Sounds like when they watch prime time TV your noise goes up. What you may be hearing is the DTV signal, being fed to the plasma display. Plasma displays are high energy devices with a high amplification factor. They are known for producing digital hash type interference, particularly on 75m, either via direct radiation or spurious emission.
« Last Edit: September 22, 2013, 12:42:10 PM by W2WDX » 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!