Another justification for not swapping for the 2.8Khz filter is that even the 8 pole filters will need to be adjusted if you want exact alignment with any other filters. Not a really big deal, but if you're a perfectionist...
73, Tom Childers Radio Amateur N5GE Licensed since 1976 QCWA Life Member 35102 ARRL Life Member Retired Professional C# Software developer http://www.n5ge.net On Fri, 7 Jan 2011 08:11:12 -0800 (PST), Bill W4ZV <btipp...@alum.mit.edu> wrote: >One comment on this. Matching the 2.7k filters is not critical at all. For >example if they vary by 100 Hz total (which is more than I've seen in >building 4 units), you can set the offset to half the difference in each >(e.g. one is -0.79 and the other is -0.89, so you set -0.84 for both). With >an actual 6 dB bandwidth of about 2800 Hz, you will never notice a 50 Hz >offset. > >2.7<>2.8k swap fee = $121, plus second 2.8k for $131, results in $252 more >expensive versus two stock 2.7k filters at no additional charge. However, >as they say "It's your money!" > >73, Bill ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
