I agree that ALE can be used to assemble special-purpose networks
based on distinguished nodes, such as your EOC example below.
I agree that amateur ALE works fine for groups of 30-60 amateurs
sharing propagation.
I agree that amateur ALE users can, when propagation results in
oversubscribed pilot channels, increase the interval between
soundings or completely forgo soundings. However, changing the
sounding policy in this way will degrade every user's ability to
determine in real time which other users are accessible.
With 1000 amateur ALE users sharing the same pilot channels, no
station could sound more frequently than once every 8 hours if pilot
channel oversubscription is to be avoided. For those amateurs wishing
to use ALE to place the equivalent of a phone call to another
amateur, sampling this coarse-grained would be useless.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, Steve Hajducek <[EMAIL PROTECTED]>
wrote:
>
>
> Hi Dave,
>
> Regarding the Sounding aspect of life, not all stations need to be
> Sounding and not all stations need to be Sounding once per hour.
> Sounding can be adjusted to accommodate the loading of a network.
The
> more stations that are ALE active on the same channel less frequent
> you sound and longer you set the LQA data base time out.
>
> For example you can implement a specific network where you really
> want to stay on the changes in propagation where you have x number
of
> target stations in each geographic area Sounding each 30 minutes
> (when not otherwise occupied) over 10 channels where the purpose of
> that network is for the users to establish a link with one of the
> Sounding stations to move traffic. So, say all 50 U.S. States had
an
> ALE station at each State EOC (just an example) or say the ARRL
> sponsored a ham in all 50 states using an ALE station and all these
> stations in either example connected to each other periodically,
then
> any user Scanning would pick up there Soundings when Scanning and
> whenever a user (from either of the two example networks) want to
> send a message via either network, they would just call the target
> Sounding station in that network, establish a link on the best ALE
> LQA ranked channel and leave a message. You can build on all this,
> from their the relay of that may could wait for the station
operator
> to manually relay it or a automated system can be created with
> routing etc., many uses have a flat model mailbox or BBS configured
> where you link with ALE and then switch to PACTOR x and
leave/pickup
> your traffic. This is ALE Network Operations where the network is
> planned, serves an on going 24/7 purpose for known number of
stations.
>
> However, getting back to Amateur Radio focus where we operate more
> loosely on a daily basis an application of much less frequent
> Soundings and longer LQA time outs as mentioned up front would
> suffice for our casual operations where stations sounded once every
3
> hours or 5 hours, the LQA database can be maintained for days, this
> yields a on going daily trend analysis of LQA data (the systems
must
> be running 24/7 for this approach) to base the automatic linking
call
> on as all data is listed as good since it has not been aged out of
> existence and if you did not hear your target station on all 10
> channels today yet, then yesterdays data would be used, for the
same
> time of day, day to day, propo is usually repetitive. So as you can
> see there is no reason to get all hung up on the massive
proposition
> of a Million or 100,000 or 10,000 or 1,000 stations Sounding
> constantly with a solid wall of ALE 8FSK Soundings, its just a
matter
> of adjusting the ALE operations as the growth of ALE usage takes
place.
>
> I hope this helps everyone understand the flexibility and
application
> of ALE better.
>
> /s/ Steve, N2CKH
>
>
>
> At 12:24 PM 9/1/2006, you wrote:
> >If propagation allows 1000 amateur ALE users to hear each other on
> >the same pilot channel, and they are all sounding for 10 seconds
> >every hour, then wouldn't the pilot channel be massively
> >oversubscribed to the point where no station could decode anything?
> >
> >1000 users times 10 seconds is 10000 seconds of transmission per
> >hour, but there are only 3600 seconds per hour. With no collision
> >avoidance, wouldn't anything more than 1200 seconds of transmission
> >per hour would be problematic?
> >
> > 73,
>
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