The documentation in http://hflink.com/ recommends that a station
transmit a 20-30 second sounding hourly on each frequency.
Below, Bonnie says "In amateur radio ALE, there is only one pilot
channel per ham band where repetitive sounding (station ID) happens
on a regular basis."
How many stations can be sounding a band's pilot channel before it
saturates? Lets assume the best case, which is that each stations
sounds for 20 seconds each hour. If the channel is perfectly
utilized, it can handle (60*60)/20 = 180 independent stations
180 non-synchronized stations attempting to sound one frequency for
20 seconds each hour would produce nearly continuous collisions. I
have yet to find any reference to collision detection and/or
collision avoidance on an ALE pilot channel. Does ALE provide some
means of reducing contention? Without contention reduction, the
practical number of simultaneous ALE stations sounding the same
frequency at the recommended rates would be in the 30 to 60 range.
How could 1000 amateur ALE operators to be simultaneously QRV with
one pilot channel per amateur band?
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, "expeditionradio"
<[EMAIL PROTECTED]> wrote:
>
> > John VE5MU wrote:
> > If we have 1000 Ale stations sounding 24/7, how much QRM
> > will this create?
>
> Hi John,
>
> It would be far less QRM than the average RTTY contest, such as we
had
> this weekend that took over a large chunk of the ham bands with
> "soundings".
>
> In fact, it is unlikely that you would notice 1000 ALE operators on
> the air, unless you tune your VFO to the specific frequency the ALE
> operators are using.
>
> In amateur radio ALE, there is only one pilot channel per ham band
> where repetitive sounding (station ID) happens on a regular basis.
The
> nature of the way ALE works enables many stations to dynamically use
> the same channel on a time/space shared basis for various purposes,
> such as messaging, calling, sounding, and geo-position reporting.
The
> global or regional capacity of a single channel for ALE is rather
> large. One channel is probabably enough to handle a 1000% increase
in
> amateur radio ALE use over the next 5 years, if and when it becomes
> that popular.
>
> It would be wonderful if we had 1000 ALE stations on the air 24/7.
> Perhaps the ALE On-The-AIR Week event in October will give us some
> idea of what is possible with a few hundred stations on at the same
> time. We don't really know yet, since this will be the first such
event.
>
> Bonnie KQ6XA
>
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