OK, I will ask... Am I correct in assuming that rules would need to change to allow automatic operation?
Is it right to think the only improvement in communications would be extending ground wave (since this would happen when the bands were not open)? What would happen when the bands did open? Would the repeaters be able to listen before transmitting? For all modes? Is the primary purpose to use the bands so we don't lose them? Howard K5HB --- In [email protected], "expeditionradio" <[EMAIL PROTECTED]> wrote: > > > bruce mallon <wa4gch@> wrote: > > Would you like to show us those frequency's? > > And would you like to show them when the MUF gets that > > high. > > Hi Bruce, > > Digital Voice repeaters, using single-channel near-real-time > interleaved multiplexed OFDM, could work in a 5kHz bandwidth. This is > a viable bandwidth for a single channel DV voice repeater in any HF > amateur radio band, regardless of propagation. > > Take a look at the nearly vacant HF amateur radio spectrum, 24 > hours/day, regardless of our position in the solar cycle: > > 21385-21450 kHz nearly vacant 24/7/350 > 24890-24990 kHz nearly vacant 24/7/365 > 28550-29500 kHz nearly vacant 24/7/350 > > Other areas of HF amateur radio spectrum are nearly vacant at > different times of day or night, relative to our position in the solar > cycle. > > During at least 4 years at the bottom of every 11 year solar cycle, > some HF amateur radio bands are nearly vacant at various times > of day or night. > > Examples of nearly vacant HF ham bands: > > 1800-2000 kHz 2hr after sunrise to 2hr before sunset > 3500-4000 kHz 5hr after sunrise to 3hr before sunset > 14000-14350 kHz 5hr after sunset to 1hr before sunrise > 18000-18168 kHz 4hr after sunset to sunrise > 21000-21450 kHz 4hr after sunset to sunrise > 24890-24990 kHz 3hr after sunset to sunrise > 28000-29500 kHz 3hr after sunset to sunrise > > 73 Bonnie KQ6XA >
