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On Tue, Jul 12, 2011 at 2:03 PM, Bill <[email protected]> wrote: > To use USB or DIGU > As I'm obviously using VAC, I suspect DIGU. > Yes. All digital modes should use DIGU. > > Question 2 > Supposedly a 30 meter jt65 frequency is 10.147 > I think it's due to the offset problem, trying to operate on that frequency > results in the error message that I'm out of the band. > 10,147 kHz is the *emission* frequency, not the *dial* frequency. If you want to transmit JT65 on 10,147 kHz and you are using the 1500 Hz filter center (JT65 assumes a 1500 Hz tone center) then you need to tune your radio to 10,145.5 kHz in order to have your signal come out the antenna at 10,147kHz. In that case the radio won't complain about being out-of-band. BTW, if you want to get closer to the band edge you can reduce the width of the TX filter so that the filter edge does not overlap the band edge. JT65 and WSPR both generate their signals with a center frequency (audio tone) of 1500 Hz. So set your TX filter to a center of 1500 Hz and a span of 300 Hz and you are good to go. Just remember that your actual signal is 1.5kHz ABOVE the dial frequency. There is a pretty good discussion at: http://hflink.com/jt65/ I also recommend reading Joe Taylor's original article on JT65 at http://physics.princeton.edu/pulsar/K1JT/JT65.pdf -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 [email protected] +1.767.617.1365 (Dominica) +1.916.877.5067 (USA) _______________________________________________ Flexedge mailing list [email protected] http://mail.flex-radio.biz/mailman/listinfo/flexedge_flex-radio.biz This is the FlexRadio Systems e-mail Reflector called FlexEdge. It is used for posting topics related to SDR software development and experimentalist who are using beta versions of the software.
