In serious RTTY DXing or contesting, one would want to use the Rigs IF 250 to 500 filter for obvious reasons(s/n ratio, dynamic range, AGC). Given this, the decoding software would need to be set at a fixed offset. I find that PowerSDR band scope provides plenty of resolution at X4 zoom to click tune a RTTY signal within plus or minus 10 hz. This is a beauty of the PowerSDR; I can see the whole RTTY sub-band, easily click tune and can still take advantage of the rigs narrow filters.
73's Mark NU6X -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ray Andrews Sent: Tuesday, July 10, 2007 8:02 AM To: flexradio@flex-radio.biz; Jim Dunstan Subject: Re: [Flexradio] RIT cleared on click tuning- RTTY problem Jim, Yep, you got it! The problem is compounded by the fact the fact that most digital mode programs, including MixW, allow you to select any signal visible within their waterfall display, therefore allowing any offset to be used. So much for your calculator! The operator would have to decide on a "standard" offset and have the capability of specifying that offset in PowerSDR. Then their digital software could tell PowerSDR the mark frequency from the DX spot & PowerSDR would know where to set the carrier frequency to tune in the desired frequency. Alternatively, the digital mode software could do the calculation & tell PowerSDR the correct offset carrier frequency. As to CW vs MCW. You are correct, my oversimplified example and a true CW transmitter would generate signals that would be indistinguishable on the air, at least in an ideal world. Actually, the FCC does not care how a rig generates a signal as long as the signal meets the technical requirements specified in Part 97. Think about it, the SDR-100 actually does generate MCW rather than CW. The SDR does not key an RF chain, but keys an audio tone which is then processed to generate a keyed RF signal at the antenna jack. (If I am wrong here will one of the Flex hardware/software designers PLEASE shoot me down!) It is due to the excellent design & quality of the SDR-1000 that this method results in a rig that meets Part 97 and generates signals that are indistinguishable from signal generated by more traditional methods. I expect no less from the Flex-5000. Flex on forever! 73, Ray, K9DUR -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/attachment s/20070710/3744bac8/attachment.html _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/ _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
