On Fri, Jun 3, 2011 at 3:55 PM, w1hkj <[email protected]> wrote: > Brian Lloyd wrote: > > > > On Fri, Jun 3, 2011 at 2:26 PM, John Witchell < > [email protected]> wrote: > >> As the gist of this thread appears to be a means of easily determining if >> your transmission is within the band limits I wonder if it would be easier >> to enter the actual band (or sub-band) limits into a config page somewhere >> and have a line appear on the waterfall as you approach the limit? >> > > No, that is the kind of thinking I was hoping to foster with my "rant". > The problem is, there are entirely too many people telling me how we should > keep doing the same things instead of asking themselves if the old methods > are indeed the best. > > Now I am making some assumptions here that I accept as standard. They > are: > > 1. Rig control is the rule rather than the exception. > 2. The radio/computer combination forms a communications system. They > are not really separate. > > Once you make that leap then perhaps what I am talking about begins to make > more sense. We don't really need a VFO control in fldigi. We already have > one on the rig. > > Try running your transceiver from 100 miles away from the desktop. There > are several who do that routinely and operate digital modes with fldigi / > flrig. The same setup is used for VOIP SSB service with the same > transceiver. >
There is no difference. You have a frequency control. In the case of SSB and CW the output frequency just happens to be the VFO frequency. In the case of digital modes, the output frequency is the combination of VFO frequency and the low IF (audio) subcarrier. Here is the thing and perhaps this will help. We already do this in the rig. Our "VFO" frequency is the composite of the first LO, the first IF, the second LO and 2nd IF. We already accept without thinking that the tuning knob is going to move everything in the proper direction and by the same amount to give us output on the proper frequency. I am taking that one step further and including that capability to include the very low 3rd IF that occurs around 1500 Hz inside the computer that is running fldigi. -- 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)
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