On Wed, Jan 12, 2011 at 11:33 AM, Graham Haddock <[email protected]>wrote:
> Drax: > > Yes, but since the convention is otherwise for SSB, I recommend that the > frequency list be explicit. > There are two parts to this problem: 1. Is the signal upright or inverted, i.e. if the baseband signal (audio) increases in frequency does the RF frequency increase (non-inverted) or decrease (inverted). Hams would probably call non-inverted USB and inverted LSB. A few digital modes, e.g. BPSK, don't care. Many do, e.g. RTTY, Olivia, MFSK, etc. 2. Is the frequency given as center frequency or as dial frequency? Hams tend to use dial frequency and then calculate the offset due to audio signal at the mic. It would be much more accurate to specify signal center frequency but that will very likely confuse some old-timers who will then be required to subtract audio frequency from signal center frequency in order to get dial frequency. Programs that control the radio usually provide the option to display center frequency directly in the waterfall and to place it in a log entry. (Fldigi, HRD, and WSPR do.) -- Brian Lloyd, WB6RQN/J79BPL 3191 Western Dr. Cameron Park, CA 95682 [email protected] +1.767.617.1365 (Dominica) +1.931.492.6776 (USA) (+1.931.4.WB6RQN) _______________________________________________ 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.
