I seem to recall that some railway systems use at about 16 2/3 Hz (one third of
50 Hz) for traction. Historically, some systems used about 33 Hz. I read
somewhere that on-board power converters on some railway systems work at about
33 Hz/275 V at full load, rising to 50 Hz/415 V when lightly loaded.
Can someone say whether my recollections are correct, please?
73 John F5VLF
> On 15 Mar 2016, at 08:42, Markus Vester <[email protected]> wrote:
> Occasionally I'm getting a new kind of interference with strong 33 Hz spaced
> lines all over the LF band. Variable RDF colour indicates that it could be
> emitted from power converters on moving railway vehicles. Several tracks for
> freight tranis are passing about 400 m south of my QTH.
> Grabber screenshot:
> Best 73,
> Markus (DF6NM)
Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE