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| To: | [email protected] |
|---|---|
| Subject: | RE: LF: Mains QRM blanker by PA0LQ |
| From: | "john sexton" <[email protected]> |
| Date: | Tue, 30 Apr 2002 11:08:43 -0400 (EDT) |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
|
Hi Dick,
The noise blanker is of interest here. I find Spectran an excellent tool for providing the second item, the very narrow adjustable non-ringing audio filter. On its own it removes practically all of the noise. 73, John, G4CNN --- On Tue 04/30, Dick Rollema > > 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 > |
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