LF: Mains QRM blanker by PA0LQ

["Dick Rollema" <d.w.rollema@freeler.nl>]

To All from PA0SE

Harry, PA0LQ, active on LF until his landlord forbade his aerial, lives
in a 12 story apartment block of which corridors are permanently lit by
fluorescent tubes. These caused such interference that only very strong
signals could be copied. Harry then constructed a blanker that operates
on the audio out of the receiver. The blanker can be synchronised to the
mains frequency and produces blanking pulses of 50 or 100 Hz. Both width
and position of the pulses can be adjusted for optimum blanking. This
brought a great improvement in reception.
Harry combined the blanker  with an active 30 Hz bandwidth
non-ringing audio filter.

I described both items in our VERON magazine Electron of June
2000. 

If there is interest I am willing to translate the text into English and
send text and circuit diagram by e-mail to anyone requesting it. Or
perhaps it could be placed on a website.
But before taking action I await responses.

73, Dick, PA0SE