[Fwd: LF: Signal enhancing noise canceller]

André Kesteloot akestelo@bellatlantic.net
Wed, 27 May 1998 09:14:56 -0400

Does anyone have an idea on how to build a better noise canceller for LF?
Andre N4ICK

Mike Dennison wrote:

> G0MRF wrote:
> > A friend who has just returned from Dayton tells me that one of the new
> > products getting the attention of the 160m operators is the MFJ 1026 noise
> > canceller.
> >
> > The unit works at RF and is claimed to be able to "Wipe out Lightening
> > crashes...Power line noise..lamp dimmers" etc.   "from VLF to low VHF"
> I, too, was excited by this description, and got the chance to test
> it. Result: it does not work at LF (well, it might help a bit at
> Radio 2 on 198kHz). There is simply not enough gain in the noise amp
> at LF to be of any use at all.
> Great idea, though. I am conveinced that an effective noise canceller
> at LF would be a boon. Nearest I have got to this was to couple my
> loop antenna to the ferrite rod of an amplified ferrite antenna, and
> then rotate each to alter the combined radiation pattern. Gives both
> peaks and troughs.
> Mike, G3XDV (IO91VT)
> http://www.dennison.demon.co.uk/activity.htm