[aprssig] Satellite positions: FREQUENCY

[Andrew Rich]

We need to start a register of info servers 

Address 
Capabilities
Responsible person

How about a time server ? 

Sent from my iPhone
Andrew Rich

On 20/10/2011, at 3:10, "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to> wrote:

> On 10/19/2011 12:15 PM, Bill Vodall wrote:
>> 
>> I'm trying to offer a globally-accessible satellite information service.
>> It will be good and I'd be taking advantage of it today if it were
>> running.   There are a couple tweaks to the system I will be
>> suggesting...
> 
> It IS running.  Just send an APRS message to ISS or any other satellite designator and, provided you've recently (within 2 hours) beaconed a position for the requesting station, you'll receive information on the next pass of the queried satellite.
> 
>> This is very good but please keep in mind what happens at the local RF
>> level and build your system to complement that...
> 
> Precisely why the centralized system is designed to be a message query/response only.  No pseudo-stations involved at this time.
> 
>> This is a real weak point in our APRS system.   That's another discussion.
> 
> I'm working to provide information based on the current APRS network capabilities.
> 
>> Also the Igates can selectively do the 'igating...'   The Poll model
>> useful at some times but for an ongoing use I hope the objects will be
>> available continuously without polling..
> 
> Personally, I'd disagree with that one, but that's not part of my current query/response design anyway.  I'm a firm believer in "information on demand" and not "flood the airways with information that one or two people might want to know in the hopes that they happen to receive it".  Subscription vs broadcast model.
> 
>> Suggestions:
>> 
>> I would suggest that you set up a dedicated server alias to generate
>> the objects.   It could respond to the simple name queries like "iss"
>> but it could also respond to its own name.
> 
> I generate no objects, just response messages.  And I'm considering an advanced-query-capable "server" (SATS was suggested, which I might use, but I was also considering SATSRV).  But in any case, I'll probably be keeping the simple "send any APRS message to the Satellite" for simple next pass information.
> 
>> Use a uniquely coded name for the objects generated.  'ISS' will be
>> used by the local servers so you could key all your objects with
>> something like 'is*'  - thus you would generate 'isISS'.  This would
>> also allow folks to gate the objects to RF based either on the name of
>> 'is*' or on the alias of the server generating them.
> 
> I researched the occurrences (or lack thereof) of the satellite names as objects before launching (no pun intended) the current service.  All local objects seem to be suffixing the object names with the AOS time which keeps us all unique.
> 
>> What happens if the server goes down?   Will there be a hot spare at
>> some other location watching and ready to take up the load?
> 
> Depends on the popularity.  Is there a hot backup for CQSRVR?  Or EMAIL-2?  Or WHO-IS?  Yes, I know there are redundant services by different names, but AFAIK no immediate backups for the main names.  Is there a backup for your local IGate?
> 
>> What happens it you get tired of this silly game and decide to go work
>> CW?   Will we lose the resource as has happened before?
> 
> I sure hope not, but the same question can be asked of local digis, IGates, and nearly everything else within APRS, right?  I do plan to put in a migration plan to cover my inevitable demise (which not not involve destruction of ANYTHING) or waning interest in APRS, but that's not anytime in the foreseeable future.
> 
>> Thanks again for all your energy and efforts here..   You've brought a
>> spark of new life to the system.
> 
> You're welcome.  It's all about having ideas and implementing them and sharing the results.
> 
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
> 
> 
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