aprs ad-hoc networks
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APRS Ad-hoc Networks
Appalachian Event 24 Jul 2011
APRS Digipeating 101
Digipeating concept:
National Digi Infrastructure
But sometimes they are down, or you need an ad-hoc network
All of these radios can digipeat!
Anytime, anywhere
Do we want them to? NO!
Horendous QRM on channel
Impossible to control
Absentee operators
Never read their messages!
Do we want them to? YES!
but only when we need it
(under our user control)
APRS Digipeating 101
Digipeating Mechanisms:
MYCALL – APRS VIA WB4APR… APRS,WB4APR* every TNC
MYALIAS – APRS VIA RELAY… APRS,RELAY* every TNC-----------------------------------------------------------------------------------------------------------------------------------
-----------------------------------------------------------------------------------------------------------------------------------
UIDIGI - APRS VIA MOBILE… APRS,WB4APR-9* Call substitution-----------------------------------------------------------------------------------------------------------------------------------
UITRACE – APRS VIA WIDE3-3… APRS,WB4APR-9*,WIDE3-2 Decrements N & trace
UIFLOOD – APRS VIA MDC3-3… APRS,MDC3-2 Decrements N
UIFLOOD (ID enabled) APRS,DIGIL,MDC3-2 Decrements N inserts
call of last digi only
UIFLOOD (FIRST kenwood) APRS,DIGI1,MDC3-2 Decrements N inserts
call of first digi
1978
1980
1995
1998
NetRom, TheNet =>
Beacons/ Digipeating illegal
APRS Digipeating 102
How we use these capabilities for APRS:
Universal path for fixed stations, VIA WIDE2-2
For Mobiles VIA WIDE1-1,WIDE2-1
MYCALL – APRS VIA WB4APR-9,WIDE2-2… APRS,WB4APR-9*,WIDE2-2anytime
MYALIAS – APRS VIA WIDE1-1,WIDE2-2… APRS,WIDE1-1*,WIDE2-2 untracable
-----------------------------------------------------------------------------------------------------------------------------------
UIDIGI - APRS VIA WIDE1-1,WIDE2-2… APRS,WB4APR-9*,WIDE2-2 dupes
UITRACE – APRS VIA WIDE1-1,WIDE2-1… APRS,WB4APR-9*,WIDE1*,WIDE2-1 ***UIFLOOD – APRS VIA MDC3-3… APRS,MDC3-2 local
APRS Digipeating 102
How we use these capabilities for APRS:Universal path for fixed stations, VIA WIDE2-2
For Mobiles VIA WIDE1-1,WIDE2-1
APRS DigipeatingWhy do we keep N to 2 or less?
UITRACE – APRS VIA WIDE1-1,WIDE2-1… APRS,WB4APR-9*,WIDE1*,WIDE2-1 ***
APRS DigipeatingWhy do we keep N to 2 or less?
UITRACE – APRS VIA WIDE1-1,WIDE2-1… APRS,WB4APR-9*,WIDE1*,WIDE2-1 ***
SSn-N digipeatingUsing the path of MD6-6 hits every digi in Maryland only
120 dupes vs 15 copies desired
APRS DigipeatingProportional Pathing!Every other packet is simplex direct. Every other is 1 hop. Every 4th is 2 hops
APRS TEMPn-N Digipeating
How to use for IMMEDIATE TEMPORARY USE?:
EVERY MOBILE and or Emergency back up system should always support TEMPn-N digipeating
MYCALL – APRS VIA WB4APR-9,WIDE2-2… APRS,WB4APR-9*,WIDE2-2anytime
MYALIAS – APRS VIA WIDE1-1,WIDE2-2… APRS,WIDE1-1*,WIDE2-2 untracable
-----------------------------------------------------------------------------------------------------------------------------------
UITRACE – APRS VIA TEMP1-1,WIDE2-1… APRS,WB4APR-9*,TEMP1*,WIDE2-1 ***UIFLOOD – APRS VIA TEMP7-7… APRS,TEMP7-6 local
APRS Ad-hoc
Networks
East Coast Backbone
Annual Golden Packet Event
Appalachian Event 24 Jul 2011
Annual Golden Packet Event
Annual Golden Packet Event
Simple digipeater node
Annual Golden Packet Event
Power is the issue
APRS HOPn-N Digipeating
For the AT Golden Packet Event, we supported 2 paths:
HOPn-N (non tracing): arrived as DIGIx,HOP7-1
TEMPn-N (Tracing): arrived as DIGI1,DIGI2,DIGI3,etc
GOLDEN packets used HOP7-7,HOP7-7 to make it 15 stations end to end
TEST packets used the minimum TEMPn-N to trace their neighbors.-----------------------------------------------------------------------------------------------------------------------------------
UITRACE TEMP - The actual TNC command to set up TEMPn-N support
UIFLOOD HOP – The actual TNC command to set up HOPn-N support
Link by Link maps
GeorgiaSpringer Mountain,
Link by Link maps
Clingmans Dome
Roan Mtn
Comers Rock
Link by Link maps
Comers
AO Mtn
Hawkbill
Link by Link maps
White Rock Cliffs
MarylandMountain
Gov Dick Hill
Link by Link maps
Link by Link maps
Camelback
Sam’s Pt
Greylock
(Highpoint)
Link by Link
maps
Sam’s Point
Greylock
NH Link?
Mt Washington
Link by Link
maps
Greylock
Mt Washington
Sugarloaf, ME
Katahdin!
More fun with Google Maps
Enter theBubble
and lookaround!
Google Earth! The shack-potato’s tool
Google Earth! The shack-potato’s tool
Live or Google?
Annual Golden Packet Event
My site. Gov’ Dick Hill
Annual Golden Packet Event
Lots of hardware to lift
Annual Golden Packet Event
Highest is NOT best!
Highest is NOT Best!
Highest is NOT Best!
Annual Golden Packet Event
Sam’s Point used D72 HT (also Mt Wash)
Mountain Top RFI!
Sam’s Point used D72 HT (also Mt Wash)
RF Link Analysis Tool (free)
KX4O John Huggins did all analysis
4040
Appalachian Trail Appalachian Trail Golden PacketGolden Packet
KX4O John Huggins Complete RF Link Analysis!
RF Link Analysis Tool (free)
But it worked for me!
Also shows statistics. Here is a -10 dB and +10 dB link
Annual Golden Packet Event
KA1YBS climbed a
mile straight up
Katahdin
APRS TEMPn-N Digipeating
How to use for IMMEDIATE TEMPORARY USE?:
EVERY MOBILE and or Emergency back up system should always support TEMPn-N digipeating
MYCALL – APRS VIA WB4APR-9,WIDE2-2… APRS,WB4APR-9*,WIDE2-2anytime
MYALIAS – APRS VIA WIDE1-1,WIDE2-2… APRS,WIDE1-1*,WIDE2-2 untracable
-----------------------------------------------------------------------------------------------------------------------------------
UITRACE – APRS VIA TEMP1-1,WIDE2-1… APRS,WB4APR-9*,TEMP1*,WIDE2-1 ***UIFLOOD – APRS VIA TEMP7-7… APRS,TEMP7-6 local
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