AND if this is true why are they not legal now?
--- expeditionradio <[EMAIL PROTECTED]> wrote:
> > bruce mallon <[EMAIL PROTECTED]> 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
>
>
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