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| To: | [email protected] |
|---|---|
| Subject: | LF: Selectivity |
| From: | "Mike Dennison" <[email protected]> |
| Date: | Fri, 21 Jan 2000 10:41:14 -0000 |
| Reply-to: | [email protected] |
| Sender: | <[email protected]> |
Interested in the discussions about roofing filters. When I was using
a ferrite rod antenna on 73kHz, it had a useful bandwidth of less
than 1kHz and needed to be re-tuned for different parts of the band
(that's when you could use the whole band - happy days!). This
suggests that a few ferrite potted inductors in cascade would provide
a front end roofing filter only a few hundred hertz wide at 136kHz.
Even easier may be a notch at 138.8 using such a coil.
Mike, G3XDV (IO91VT) http://www.dennison.demon.co.uk/activity.htm |
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