Hi Jim, Apologies if my post was confusing.
Yes, I'm attempting to reject 1500 KHz, which is the IF frequency. The receiver covers 0.3 - 1.2 MHz, and 1.7 - 17 MHz, skipping a band approximately centered about the IF frequency. Therefore, the ideal (and impossible) filter would be a brick wall stopband from 1.2 - 1.7 MHz, with zero attenuation outside of that range. I mentioned 80M only to comment that I noticed no attenuation that far removed from the filter center frequency. Yes, I wanted minimal attenuation at 160M as well. There were no signals on that band when I was playing with this last night around 7PM local time to use for reference, which is why I didn't quote attenuation for 160M. However I was hearing plenty of static crashes on 160M with and without the filter. I imagine the attenuation on 160M will be somewhat similar to what I saw at 1.13 MHZ, roughly 12 dB - nothing to write home about, and hardly optimized, but good enough considering the time and effort I care to invest in this particular project. 73/TNX, -Larry/NE1S ----- Original Message ----- From: "Jim Tonne" <[EMAIL PROTECTED]> Sent: Mon, August 11, 2008 13:33 Subject:Re: [AMRadio] 1500 KHz trap for NC-156 Larry: Let me jump in on that trap thing for just a moment. You are trying to reject what frequency / frequencies? And you want to pass what frequency / frequencies? Reading your last mail here leaves me confused as to what you wanted to do. I thought you wanted to reject 1500 or so and still pass 160 meter band but you just now mentioned 1100 and the 80 meter band. - JimT ----- End of original message ----- ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
