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| To: | <[email protected]> |
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| Subject: | LF: Re: 500kHz qrg range |
| From: | "James Moritz" <[email protected]> |
| Date: | Tue, 18 Aug 2009 22:12:20 +0100 |
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Dear Dennis, LF Group, So I ask myself and now You :) , would You say it's important to keep the full rx range from 495kHz to 510kHz and >pay the price of a worse stopband attenuation, or do You think, it's unlikely to hear any transmission at the band corners? Certainly some of the US stations were operating beacons above 507kHz last winter, so I would make the upper cut-off frequency 510k or above - it would very frustrating if you could not receive signals because your own preselector rejected them! If you need better stopband rejection, you could add an extra resonator to the filter. Cheers, Jim Moritz 73 de M0BMU |
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