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Conference terri::cars_uk

Title:	Cars in the UK
Notice:	Please read new conference charter 1.70
Moderator:	COMICS::SHELLEYELD

Created:	Sun Mar 06 1994
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2584
Total number of notes:	63384

1460.0. "Buzzz Buzzzz " by BRUMMY::PARISH () Mon Jun 03 1991 15:26

    Radio Interference....
    On the Vauxhall calibra I use the GM intigral alarm system radiates 
    what seems to be computer generated interference across FM band II and
    more importantly all over the 2 meter Ham band ......
    It seems that you cannot dis-connect the alarm as it is intigral part of
    the ignition system....
    Help...  can anybody advise me on how to stop this interference.
    
    Regards...Graham..G8RDX.

T.R Title User Personal
Name Date Lines

1460.1 An Earthy problem? TRUCKS::SMART When you're in a hole, stop digging! Mon Jun 03 1991 16:22 21

T.R	Title	User	Personal Name	Date	Lines
1460.1	An Earthy problem?	TRUCKS::SMART	When you're in a hole, stop digging!	`Mon Jun 03 1991 16:22`	21
	Is the broadcast receiver the standard Vauxhall supplied unit? If so then claim under the warrenty and get GM to sort it. If the supplied combination doesn't work then moan until it does. As for your ham rig, I had a similar problem many years ago with a series 2 Ford Granada with the electronic ignition unit. My old Pye Reported was fine but the FDK (microprocessor PLL) had severe problems. I tracked it down using a 'scope, calculated the frequency of the interference and then made a simple filter and put it in line with the rig. That fine if it's through the power line, if it's radiated then it's more complicated. Check all the obvious things like earthing to rig and aerial and that you have no 'floating' panels that are radiating because they are not properly earthed. Potential offender is the bonnet. Alan G8ODN

    Is the broadcast receiver the standard Vauxhall supplied unit?  If so
    then claim under the warrenty and get GM to sort it.  If the supplied
    combination doesn't work then moan until it does.
    
    As for your ham rig, I had a similar problem many years ago with a
    series 2 Ford Granada with the electronic ignition unit.  My old Pye
    Reported was fine but the FDK (microprocessor PLL) had severe problems.
    
    I tracked it down using a 'scope, calculated the frequency of the
    interference and then made a simple filter and put it in line with the
    rig.
    
    That fine if it's through the power line, if it's radiated then it's
    more complicated.  Check all the obvious things like earthing to rig
    and aerial and that you have no 'floating' panels that are radiating
    because they are not properly earthed.  Potential offender is the
    bonnet.
    
    Alan  G8ODN