[OZAPRS] Sydney Basin RF Gating

Tue Aug 29 00:12:03 EST 2006

> From: ozaprs-bounces at aprs.net.au 
> Now having an RF receive capability I have been able to 
> monitor the APRS frequency and see for myself what is 
> happening.   My TNC DCD LED being nearly constantly lit. 

Look at the packets and look for dupes of the same packet from
the same digi.  In Baltimore area (USA) which has the highest
density of APRS on the planet and is between two other cities of
equal loads, a constantly busy channel was all we used to see
also.  Nothing worked reliably.

But then we notice that most of the traffic were duplicates from
missocnfigured digis and users.  Thus we developed the
New-N-Paradigm to get it all fixed.  Now there are several
seconds between most packets, and yet we are still supporting
the same number of users and the channel is now much more
reliable.

So analyze what is going on, and see about fixing it.

See http://www.ew.usna.edu/~bruninga/aprs/fix14439.html

There are lots and lots of ideas there...  See which ones might
help out in your area...

Bob, Wb4APR

OK, if  I'm copying this how about VK2JPJ-1 
> which was most likely to be my point of entery into the APRS 
> network when mobile. So having a look at the VK2JPJ-1 heard
list,
> 
> mh
> SYDCBD:VK2JPJ-1} MHEARD:
> 12:27=VK1NPW-1* 12:26=VK2TSB    12:25=VK1NPW-2  
> 12:24=VK2INT-1* 12:24=VK2INT-1
> 12:24=VK2EMD*   12:23=VK2JNT-1  12:21=VK2AMW-3  
> 12:19=VK2JPJ-1* 12:19=VK2RAG-1
> 12:18=VK1RGI-1* 12:15=VK2EMD-4* 12:11=VK1KCM-9* 
> 12:08=VK1VIC-1  12:08=VK2AR-1*
> 12:07=VK2AR-1   12:05=VK2RAG-1* 12:05=VK2AMW-1  12:04=VK1NPW  
>   12:02=VK2AFY*
> 11:55=VK2CSU-1* 11:50=VK2AMW-1* 11:47=VK2AMW-3* 11:45=VK1HFC  
>   11:16=VK2AMW-4*
> 11:07=VK1NFI    10:48=VK2TSB-3* 09:43=VK2DRK    09:39=VK2JGV* 
>   09:39=VK2JGV
> 09:07=VK2ZSZ    08:59=VK2TDS-1* 08:59=VK2TDS-1  08:31=VK2SX*  
>   08:12=VK2MIK*
> 07:48=VK2US-10* 07:48=VK2US-10  07:41=VK2INT-9* 07:01=VK2EZD  
>   06:35=VK2TSB*
> 05:56=VK2HIM-7* 05:53=VK1MRH-9* 05:49=VK2ZSZ-9* 05:30=VK2EZD* 
>   05:09=VK2BES*
> 04:52=VK2KJB*   04:29=VK2APE-9* 03:37=VK2INT-9  01:18=VK2BES  
>   01:08=VK2EJC-3*
> 23:55=VK2ZOM-1* 23:13=VK2ZOM-2* 22:55=VK2KCL-9* 
> 22:18=VK2INT-15*22:17=VK2INT-15
> 19:03=VK2AFY    10:57=VK2KJV*   04:12=VK2ZSZ-8* 
> 02:53=VK2JNT-9* 02:42=VK2JNT-9
> 10:42=VK2KCM-9* 07:52=VK2LI-9*  07:18=VK2LI-9   
> 05:57=VK1HCT-11 03:22=VK2CAW
> 06:14=VK2GRM*   03:18=VK2LI*    01:14=VK2ZOM-2  
> 05:12=VK2EJC-3  02:51=VK2HIM-7
> 23:23=VK3HIV-9* 12:05=VK2INT    07:08=VK2UAI-9* 01:55=VK2AWZ* 
>   01:51=VK2AWZ
> 03:49=VK2SKY-9* 03:49=VK2SKY-9  01:59=VK2CMO-9* 
> 01:59=VK2CMO-9  22:26=VK2AMW-2*
> 
> 
> >From this we see that VK2JPJ-1 is hearing VK2AMW-1 as well 
> as VK1 stations direct and I thought my DCD LED is busy. I'm 
> assuming that those calls without a * have been heard direct.
> With regard to the above I feel it is not necessary for me to 
> add to the congestion by gating traffic to RF from the 
> Internet other than that stated above. Also adding to my two 
> cents worth is there, with consideration to the now 
> widespread use of Broadband, a requirement for all this 
> traffic to be gated to RF on such a wide scale? As I see it 
> every oppurtunity should be given to mobiles to access an 
> I-Gate or local Digi. If users or their ' ham buddies ' can't 
> see much happening because of  lack of mobile position 
> beacons making it on to the network then they are likely to 
> give up APRS as a bad joke.
> Please, this is not meant to be criticism of anyone in 
> particular. As I'm only interested in having a workable RF 
> network available to all.
> 
> Regards Mike, VK2INT.
> 
> 
> Quote UI-View IGATE.INI
> 
> NOTE - The capacity of a 1200 baud RF channel is around 30 
> frames a minute (obviously it depends on frame length, TXD 
> settings, etc). To gate 6 frames in a minute means that you 
> are taking up around 20% of the channel capacity, and that's 
> not allowing for your frames being digipeated! So before you 
> increase these numbers, please bear in mind that many APRS 
> experts would say that the defaults are too high. You should 
> always try to use values that are appropriate for local
conditions.
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs
> 

_______________________________________________
Ozaprs mailing list
Ozaprs at aprs.net.au
http://aprs.net.au/mailman/listinfo/ozaprs
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://second.aprs.net.au/pipermail/ozaprs/attachments/20060829/6bcaee4a/attachment.htm 