To: | [email protected] |
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Subject: | Re: LF: 33 Hz QRM |
From: | John Rabson <[email protected]> |
Date: | Wed, 16 Mar 2016 15:56:00 +0100 |
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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: > http://df6nm.bplaced.net/LF/screenshots/test1603150730.jpg > > Best 73, > Markus (DF6NM) [email protected] Researching history of RABSON, BLACKSHAW, GAUNTLETT, VERLANDER and ROBSONNE |
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