Hi Dave, May I know if there is another profile available that is optimized for weak signal work? Meaning the settings are providing the maximum ability to deal with low SNR conditions. THanks 73/jef
Hi Dave, I will be looking very much forward to your magic touch on MMTTY. Just thought that this program is so widely used by the RTTY enthuiast community, that some enterprising DX'er would have co
Hi Bill, Great information on RITTY. It's a real shame that code could not be rolled into a modern program. As far as I've seen, none of the modern decoders are said to work as well. But then again,
Gentlemen, I and a few other guys are working on a project to get a very high quality set of crystal filters built for the Yaesu FT2000. The rig is an otherwise very fine unit but the front end is a
Glenn, Many thanks. Now that reply - that's what I like. A man with an unambiguous position! I guess you are saying, "any filter is fine, as long as it's 300 hz." :) 73/jeff/ac0c ____________________
Thanks Joe for that great detail. I did not realize the 250 hz K3 filter ran close to 370 @ -6db. The 400 hz is only 50 hz wider at the -6db point - quite close to the named value. The SSB filters lo
Ron, S&P - you make a good point. If you are in the RUN mode, what's your preference? 73/jeff/ac0c _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.c
John, Thank you. Today we have been looking at the actual widths vs. the named widths on some of these filters. There is a lot more disparity on the low bandwidth end than on the wider filters which
Chen, You are right about the ideal DSP being able to handle the selectivity processing. But for our project, we are not assuming that is the case at all. The filter specifications are under our cont
John, That's great to know. Looking at the -6db point, I want to say that Inrad filter runs close to 300 hz or so. Thanks for your comments 73/jeff/ac0c ______________________________________________
Chen, Thanks for pointing me to Jim's site on this filter comparison. I have used his RFI white paper and RF choke design recommendations before. He really is one of the masters. K3 400 is 425. I thi
Chen, Fascinating explanation. Best technical treatment of this subject I've seen. The summary trade-off compromise (if I am understanding your comments properly) is something like this: 1. With a mo
Chen, I met my Chinese wife when I lived in China and wanted to learn Chinese. So from 3rd language standpoint, I consider your English to be really excellent. And I also 100% understand your meaning
Joe, Thanks for catching my error. The wider bandwidth improves the SNR to an extent. I would think this is an asymptotic curve to a point... You make good points about the practical nature of this d
David, The trend with RTTY is more toward software demodulation - and it's been that case for years now. Dedicated terminal units like KAM are functional - but unless you have a 1990 vintage PC in yo
That is a great idea Bill 73/jeff/ac0c _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.contesting.com/mailman/listinfo/rtty
Gentlemen, I am confused at the comments of "narrow band" - and considering that 160m is 200khz wide. These two ideas do not seem to go together. So I wonder if there exists an assumption is that the
Joe, Serious about this reply? RTTY is "polluting" the band and somehow AM is acceptable? How many RTTY sigs can you get into the bandwidth of a single AM transmission. In fact, how many RTTY sigs co