summary: power supply and chassis

[Tim Ressel]

Sometimes the railroads run low frequencies down the tracks around crossings to
detect when a train is approaching. They place resonant shunts on the track
which turn the track into a loop antenna that can be miles long! This may be the
source of your interference.

Tim Ressel -- Hardware DQ
Hewlett-Packard
Verifone Division
916-630-2541
tim_r1 at verifone.com



> ----------
> From: 	Haible Juergen[SMTP:Juergen.Haible at nbgm.siemens.de]
> Sent: 	Thursday, July 01, 1999 6:48 AM
> To: 	Martin Czech; synth-diy at mailhost.bpa.nl
> Subject: 	RE: summary: power supply and chassis
> 
> 	>(some MHz).  The railway is r=20m away, so there is strong 16,333
> Hz
> 	>(yes sixteen and a third) and also railway radio interference. 
> 
>