The APRS Land Network

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The APRS Land Network
Aa
Digipeaters
And to the Internet Gateway
Multiple Hops
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IGates (Global APRS!)

• An IGATE is a local APRS station that utilizes
  the APRS-Internet network to pass all packets
  heard on their local RF back to the
  Internet.(Gives global views to local activity.)
• Also act as two-way gateways for ALL APRS
  MESSAGES worldwide (Internet Û RF).

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Global Mobile Portable ComAPRS
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Mar 2010, K9DCI
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APRS-Internet System (APRS-IS)
Situational awareness Internet services
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Findu.com etc. Mapping
Internet tracking developed by Steve Demise K4HG
Feb 2009, K9DCI
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WeLCARS Tech Fest
Image from DB0ANF site
Feb 2009, K9DCI
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FINDU Stations Near List
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FINDU Stations Near Map
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FINDU - Messages
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Findu.com Weather Data

Temperature Dew Point
Rainfall Rates
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Locate on Weather Radar
Feb 2009, K9DCI
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Spotter Network
http//www.spotternetwork.org/
Register with the Spotter Network Put !SN! in
your comment Youre on their map.
May 2011, K9DCI
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Long Term Tracking
My travels in December 06 through May 07. Note
lack of coverage areas.
Feb 2009, K9DCI
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APRS for Special Uses

• Bicycle rallies, races
• Walk-a-thons, Parades
• Skywarn
• Weather Nets
• Crime prevention patrols
• Tornado recovery
• Damage assessment
• Direction Finding Foxhunts
• Voice for communications, APRS for visual mapping
• Now integrating into APRN (Automatic Picture
  Relay Network)

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Buoys Stuff
German Buoy and Balloon projects
BUOY 4
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Findu.com Telemetry Plots
Google for USNA Buoy Select USNA-1
Google for USNA Buoy Select USNA-1
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Other (APRS-IS) Services

• World-Wide real-time one-to-one Messages - Via
  Internet.
• Very short one-to-one messages. Between any
  two active stations.
• Allows WORLD-WIDE Voice QSOs with IRLP Objects
• Send TO Callsign-SSID
• EMAIL - Goes into the Internet e-mail system.
• Very short messages. Single APRS message, Send
  only.
• Send TO EMAIL, SMAIL, or AE5PL-EM (added
  features)
• Email address first in message. Server sends
  ACK.
• WHO-IS or WHO-15 (some Digis require number
  SSID)
• Send TO WHO-IS or WHO-15 Call sign is the
  message.
• License class, name, state country are
  returned.
• CQ - World-wide real-time one-to-many messages
  (reflector).
• Send TO CQSRVR Msg is CQ groupname
• Used on Field Day CQ FD CQ FD... Valid for
  12 hours.

May 2010, K9DCI
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Other (APRS-IS) Services (Cont.)

• Web Browser gt RF messages. Via Findu or OpenAPRS
• APRS tt DTMF / Voice interface for anyone
• Another program on the Digi.
• Any DTMF radio can be put on APRS network.
• Voice response from APRS network.
• Also sends DTMF messages in DTSS format.
• Allows WORLD-WIDE messaging with IRLP
• Loosely related
• PC with DTMF Decoder
• DTSS Radios.
• Several HTs have DTMF message receive
  capability
• Send and Receive DTSS
• Kenwood TH-28A/48A/78A
• Yeasu FT-11R,41R,51R

May 2010, K9DCI
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APRS is in Orbit

• APRS space frequency is 145.825 MHz
• Also via GO-32 on 435.225 downlink, 145.85 MHz up

Feb 2009, K9DCI
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Into Space..PCSAT

• The Prototype Communications Satellite, is a US
  Naval Academy Aerospace student project.

ANDE and RAFT in Dec 2006

• APRS space frequency is published as 145.825
• As of June 2008 currently useable ISS, GO-32,
  ECHO and PCSAT when it is in good sun.

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PCSAT Satellite

• Launched Sept 2001 from Kodiak Alaska
• The first APRS satellite, and has since been
  joined by 5 other such satellites
• Can capture Emergency /Priority messages from
  THD7 / D700 radios anywhere on the globe and
  retransmit these signals on the USA VHF 144.39
  APRS frequency.

See live downlink on http//pcsat.aprs.org
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International Space Station

• ARISS supports APRS on its 145.80/145.99 packet
  system.
• Use digipeater path VIA ARISS.
• PCSAT2 was also on ISS 2005-2006
• Also has FM voice repeater capability

PCSAT2, was the second APRS digipeater satellite.
See live downlink on www.ariss.net
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Now GO-32TECHSAT-1b

• GO-32 now supports APRS on its 435.225/145.85
  packet system.
• APRS up on 145.85 (PCs and messages)
• Mic-E up on 145.93 (D7 and D700s)

9600 Baud!
See live downlink on www.ariss.net
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GO32 -EZ - MOBILE SatellitePrediction and
Tracking

• No computer needed
• Two or more solid TX/RX passes every day
• Two additional TX passes 100m before and after!

Fri 26 Oct is day8
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Tracking ECHO (AO51) too!
Friday October 26th is day 4!

• No computer needed
• Two or more solid passes every day

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LEO Pass Geometry

• Bottom line
• 10 dB gain Horizon-to-horizon
• 98 of all in-view times
• Using 75 TV rotator only

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Omni SatGates
Up coming satellite strength in next two hours.
10 minute ticks.
Feb 2009, K9DCI
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Omni Antenna Gain 7 dBi !
Anyone can be a SATgate!
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30
The 2 meter 1/4 antenna has good gain at
satellite elevations on both 144 440.NO Sat
tracking necessary!
3/4
1/4
Best elevation for reception
70
Set the D700 or D710 to digi from B side Sat freq
to A side 144.390
Data from omni antenna GPS satellite strength.
Percents are passes in each region.
Feb 2009, K9DCI
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Omni SatGates
Packets Received Per Minute vs. Satellite
Elevation
This is with a 3/4 wave vertical. Below 25
degrees, satellites are further, thus 6-10 dB
weaker.
Feb 2009, K9DCI
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ASatLogger
APRS Satellite Tracker Current Ver 0.6.1 Beta
0.6.2
Feb 2009, K9DCI
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ASatLogger Features

• Facilitate comms with APRS and Packet Satellites.
  
• Control Kenwood D7, D700, D710's - serial port.
• Adjust D7 and D700 radio's automatically for
  Doppler shift - not the D710.
• ASatLogger reconfigures D7/D700/D710 in seconds
  for different satellite.
• Relay satellite packets to the APRS-Internet
  System and FindU.com.
• Log Packets to disk for a permanent record.
• Allow others to monitor Satellite communications
  via your station.
• Control a D7, D700, D710 and operate AsatLogger
  via Internet.
• Files for common satellites and radios included.
• Track multiple satellites - requires a Nova DDE
  Server and D7, D700, D710.

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APRS Emergency Comms
Satellite-Simulated Emergency Test SSET - Send
an emergency Email via Satelilite Meteor-Scatter
Monitoring Network (6 meters) - Dozens of Igates
monitoring 50.62 MHz - Message Throughput in
minutes - Using surplus 110 Watt 6m radios -
Simple 100 long wire gain antennas
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Other Items

• Local Info
• Local repeater Freq PL sent by digi. Meetings,
  Nets Hamfest Info.
• Packet Cluster D700, D7 D710 display them.
• HF APRS
• 30 Meter HF APRS frequency. Caution Carrier out
  of band (10.151).
• 300 baud. Subject to normal skip.
• PSK 63 New in 2010
• HF APRS Boat and RV Tracking Net.
• Carrier Mode NORMAL USAGE
• 7.085 LSB Regional HF tracking nets
• 10.151 LSB National HF tracking freq
• 14.100 LSB DX tracking freq
• 14.105 LSB Packet Keyboarding freq
• RFID New 125 kHz. Tags send into APRS network -
  At Dayton 2010

May 2010, K9DCI
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APRS Emergency Power
200W Solar Power - Continuous 10 kW gas
Generator 220 VDC - Auto-runs as needed -
lightweight wires
Bob Bruningas Solar augmented Prius
Low Cost
Feb 2009, K9DCI
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Questions ? ? ?
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Slides from Bob Bruninga except as noted. Many
were modified for this presentation
May 2010, K9DCI