Hi Guys, I'd appreciate your thoughts on the best roofing filter: 250hz vs. 400hz, for RTTY contest conditions. While I really like the K3 on RTTY, I believe improvement can be made to my K3 RTTY reception. Some contesters have told me that they use the 250hz roofing filter exclusively when operating RTTY contests. Since the actual bandwidth of the 250hz roffer filter is close to 370hz, and RTTY signals are typically about 370hz wide, then the 250hz roofer along with a 400 or 500hz DSP setting should be close to ideal when maximum selectivity is needed. However, on both of my K3's, when I switch from the 400hz roofer to the 250hz roofer, the RTTY signal is decoded a lot less often, about 25% less often. It doesn't seem like the 400hz roofer should decode 25% more often than the 250hz roofer. (but perhaps that's normal?) Perhaps there is a receiver setting change I can make to the K3 that will improve RTTY decoding when using the 250hz roofer? I've tried various shift settings when the 250hz roofer is engaged and sometimes it improves RTTY reception, but not consistantly. Perhaps there's a setting change I can make to MMTTY? By the way, I'm using both MMTTY and 2Tone software's for decoding RTTY, with basically the same results when the 250hz roofer is engaged.
Thanks in advance for your thoughts. 73, Dick- K9OM ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
