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Transcript of Bob Bruninga WB4APR US Naval Academy Satellite Lab [email protected] Dr. Mirek Kasal OK2AQK Tomas...
![Page 1: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/1.jpg)
Bob Bruninga WB4APRUS Naval Academy Satellite Lab
Dr. Mirek Kasal OK2AQKTomas Urbanec, P. Vágner
Mike Ruprecht, DK3WN
2015 Smallsat Cubesat Conference, Utah
Ocean Buoys w/ RF TerminalsOcean Buoys w/ RF Terminals
GROUNDSTATION
Cubesat Remote Data & Comms Transponders
A satellite relay channel for Amateur Satellite User data anywhere on earth. PSAT
![Page 2: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/2.jpg)
Cubesat Remote Data & Comms Transponders
The Earth The Air
The Climate The Water
The Wildlife Humanity
Human-to-Human communications
Remote Robot communications
A satellite relay channel for Amateur Satelilte User data anywhere on earth.
![Page 3: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/3.jpg)
Cubesat Remote Data & Comms Transponders
Engineering Educational Objective:
One or two semester student engineering projects
Individual engineering responsibility
Low cost
Driven to completion
Where Failure (learning) is an option
A satellite relay channel for Amateur Satelilte User data anywhere on earth.
![Page 4: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/4.jpg)
Cubesat Remote Data & Comms Transponders
Problem with Spacecraft segment focus:
Multi-year, often delayed, expensive small cubesats do not well meet these particular undergraduate objectives.
A satellite relay channel for Amateur Satelilte User data anywhere on earth.
![Page 5: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/5.jpg)
Solution: Ground Terminal Applications Focus
OR
OR
OROR
Supports Student Experimenters world wide
![Page 6: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/6.jpg)
604/19/23APRS Global data network
604/19/23
Ground Terminal Applications Focus (force tracking and text-messaging)
Supports Student ExperimentersSchool missions/movementsTheater area communicationsand Emergency Response Comms
Education
Force
Multiplier!
Quicker Student involvement using a Ground Terminal Operational Concept
![Page 7: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/7.jpg)
704/19/23APRS Global data network
APRS Local & Global Internet linked Data Network
APRS Global Packet Radio Network
Internet Linked for live Communications
Automatic Packet Reporting System
![Page 8: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/8.jpg)
Arctic Buoy Student Experiment
• USNA Arctic Buoy deployed March 2012
The APRS piece
![Page 9: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/9.jpg)
Example Remote Sensors using Example Remote Sensors using APRSAPRS Protocol Protocol
Very Simple
APRS transmitter
GPS
![Page 10: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/10.jpg)
Why We Need Psat Satellite Transponders
• Transatlantic APRS balloon launched and tracked through terrestrial network
• Lost comms over Atlantic Ocean• It could have been picked up by our
Psat/Pcsat transponder or the ISS
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Global Wilderness Areas (90% of Earth)
• Live Global APRS Balloon Tracking Web Page
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Global Wilderness Areas (90% of Earth)
• Live Global APRS Balloon Tracking Web Page
M0XER-3, 4 and 6
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Tiny M0XER APRS (balloon data) payloads
‘M0XER-4‘round-da-world
434 MHz
![Page 14: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/14.jpg)
“APRS” Tracking
Track any experiment anywhere and collect data
Tactical situational awareness
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1504/19/23APRS Global data network
1504/19/23
Hand-Held Satcom via APRS & Psat
Ground Terminal is Walkie-Talkie, and Palm Pilot
“When you have no comms, 1200 baud text/data is great!”
CAPT Chas Richard
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MAREA* Rover Projects ( ARRL)
• STEM School projects
• Excite kids with Robotics
• Drive anywhere on Earth!
• Via APRS links
*http://www.arrl.org/marea-ham-radio-robotics
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Ground Terminal Applications FocusPsat USNA-0601
Tactical Situational Awareness and Text Messaging
Last 100 stations!
Direction & Distance
Frequency and Tone
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APRSAPRS Experiment Data Access (via internet) Experiment Data Access (via internet)
http://map.findu.com/wb4apr* to see data on ANY experiment in the world
* Click to see all stations on map
Based on the USNA Automatic Packet Reporting System
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Tracking (on Google Earth)
http://aprs.fiMap.findu.com/wb4apr*
Tactical situational awareness
![Page 20: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/20.jpg)
Findu.com Telemetry Findu.com Telemetry PlotsPlots Live Example: www.aprs.org/wb4apr-15.html
![Page 21: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/21.jpg)
Our Amateur Satellite Data Relay Problem
• ISS – Always there, but
does not cover the poles
• PCSAT-1 since 2001, but only works when it wants to…
• NEED a continuous presence in space for these relays!
• The more the better!
![Page 22: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/22.jpg)
2204/19/23APRS Global data network
Dual Hop Operations with PCSAT-1 and PCSAT2:
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2304/19/23APRS Global data network
All on 145.825 MHz
See live downlink on http://pcsat.aprs.org and www.ariss.net
1990
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APRSAPRS in Space in SpaceAAutomatic utomatic PPacket acket RReporting eporting SSystemystem
• 2001 2001 PCSAT-1PCSAT-1 Prototype Comm (semi-operational)Prototype Comm (semi-operational)• 2006 2006 PCSAT2PCSAT2 on ISS (returned after 1 year)on ISS (returned after 1 year)• 2007 2007 ANDEANDE de-orbited in 1 yearde-orbited in 1 year• 2008 2008 RAFTRAFT de-orbited in 5 monthsde-orbited in 5 months• 2007 2007 Present ISSPresent ISS semi-operational due crew settings semi-operational due crew settings• 2014 CAPE II AX.25 U of Louisiana (Nick Pugh)2014 CAPE II AX.25 U of Louisiana (Nick Pugh)• 2015 PSAT 2015 PSAT APRS and PSK31APRS and PSK31
Experimenters need a continuous Transponder in SpaceExperimenters need a continuous Transponder in Space
APRS space frequency is published as 145.825APRS space frequency is published as 145.825
See live downlink on http://pcsat.aprs.org and www.ariss.net
![Page 25: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/25.jpg)
2504/19/23APRS Global data network
2504/19/23
Huge reduction from transponders on PCSAT’s 1,2, ANDE and RAFT missions
Now reduced 18:1 in volume/mass for 4” cubesat 2009
Psat USNA-0601
Earlier reductions to 5” cubesat on RAFT (2006)
4:1
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2604/19/23APRS Global data network
A single 3” Square card
Mission: Remote Data Relay, Data Exfiltration, Remote Sensor Relay
Benefit: Support Space Education on the ground through space applications and student experimental access
Hardware: VHF simplex data Xsponder 145.825 MHz
Size/Mass: < 10 cu.in (1 PCB 3.4” square), <0.1kg
Power: < 1W orbit average, 5 volts.
Integration Requirement: Simply, on/off (or *)
Structure Impact: Needs 19” thin wire whip antenna (1 cu.in)
Benefit to Spacecraft: High visibilty to worldwide educational institutions, fosters collaboration, orders of magnitude greater student experimental access to space systems (ground segment). * Independent back-up telemetry command/ control channel, RS232 serial data, 16 on/off discretes, backdoor reset capability. Worldwide Telemetry Beacon access via global station network.
AX.25 145.825 MHz
![Page 27: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/27.jpg)
2704/19/23APRS Global data network
Psat APRS Network Architecture
Global Volunteer Ground Station Network
Internet Linked for live Telemetry
![Page 28: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/28.jpg)
2804/19/23APRS Global data network
Global VolunteerGroundstations
feed live downlink into Internet
![Page 29: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/29.jpg)
2904/19/23APRS Global data network
70 APRS Satgates hear ISS, but only 10 hear PSAT (- 17 dB)
![Page 30: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/30.jpg)
3004/19/23APRS Global data network
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Communications Mission Background
APRS is everywhere * (Remote Data Relay)
300 stations In 35 miles
FOCUS:
“Network
Centric”
&
Remote Sensor Experiments
APRS35 mi
Find any station, Any map, Anywhere- http://aprs.fi
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3204/19/23APRS Global data network
3204/19/23
APRS Terrestrial Data Relay Network
Supports over 20,000+ terrestrial users and experimenters.
But stops at the shoreline and has huge holes in the wilderness
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3304/19/23APRS Global data network
3304/19/23
Satellite Users more sparse – Need to Track to Use
Vandegriff
PCSAT2 User Plot 18 Apr 06
![Page 34: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/34.jpg)
There are terrestrial network holes everywhere
Just like cell coverage,
Maybe 70% of USA users are actually out of range of the terrestrial network in rural areas
And the terrestrial user does not know when the nextAPRS satellite is in view…
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Our next QIKCOM-1 has an alert Beacon
When over USA, a 1 minute beacon on terrestrial frequency:- Won’t be heard amongst the din on the terrestrial freq in coverage areas- Will be heard by mobile out of range of terrestrial connectivity- Format is QIKCOM-1: 145.825MHz, Tune to operate- One-button satellite access!- On the front panel of the radio!
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Remote Sensor Baseline
Piggrem
See Buoy Location and Telemetry athttp://www.ew.unsa.edu/~bruninga/buoy4.html
PsatUSNA-0601
2006 2008
15:1 reduction
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3704/19/23APRS Global data network
3704/19/23
Remote Buoy Baseline Test – Success of 1 min Xmit rate
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3804/19/23APRS Global data network
If it flies, it could have an APRS transponder on it
• If it is off the ground we want a TRANSPONDER on it!
• Range at 5000’ = 100 miles
![Page 39: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/39.jpg)
3904/19/23APRS Global data network
QuickLook: Global APRS Data Network
•aprs.fi - Every Packet on Earth
•ariss.net - Every packet via ISS
•pcsat.aprs.org – Every packet via PCSAT
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4004/19/23APRS Global data network
4004/19/23
Psat Transponder & Aux Payload
75% Payload Space Available! (only 50% shown here)
18 cu.in for TransponderExternal 19” whip antenna68 cu.in for Aux Payload (SPMS?)Aux payload gets 4” external panelAug payload gets .5 kg – self contained1 to 3W average power for aux payload
Vandegriff
Psat USNA-0601
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PSAT Unique parallel-charge EPS Design
• Uses 2 NiCd cells per solar panel
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Unique Power Attitude – Z coil ADCS
• Uses only one Z coil for attitude Control• Fires only within +/- 20 deg of Equator• Solar Panel angle better than 95% power• Higher reliability• Passive Spin maintenance
Differential Radiation Spin
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PSAT’s mass is centered in Z
• For Maximum MOI about Z
• Batteries to outside for MOI & Shielding
• Stainless steel belt around everything
4304/19/23APRS Global data network
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4404/19/23APRS Global data network
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• When we find the time we are really looking forward to understanding our Solar Radiative Spin system.
4504/19/23APRS Global data network
1 Aug is 27 RPM!
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PSAT: Aux PSK31 Transponder Payload
• Flew on PCSAT2 on ISS but astronaut broke off HF antenna
• Flew on RAFT but took 1 kW uplink and negative power budget
• Now Operational since May 2015 launch of PSAT and BRICsat
• Both transponders built at Brno Univ, Czech Republic.
4604/19/23APRS Global data network
28 MHzSSB uplinks
435.350FM downlink
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PSAT: PSK31 Transponder Payload !!!
Built Dr. Mirek Kasal OK2AQK and students Tomas Urbanec, P. Vágner
4704/19/23APRS Global data network
HF Linear RX FM XMTR
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4804/19/23APRS Global data network
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Tuning Antennas on a 7” Spacecraft
4904/19/23APRS Global data network
Imagine turning a 6’ HF whip on a 7” spacecraft Ground plane!
Any instrument connection detunes SWR to infinity
So, Put Analyzer inside!
![Page 50: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/50.jpg)
PSAT Nitinol Wire Whip Antennas
5004/19/23APRS Global data network
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Wrapping Antennas to one Burn Resistor
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2 Orthogonal UHF whips
One VHF whip
One 6’ HF whip
3rd Enable Switch
![Page 52: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/52.jpg)
5204/19/23APRS Global data network
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5304/19/23APRS Global data network
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How not to Make a Satellite
5404/19/23APRS Global data network
Stop adding neat features…
Make sure it fits
![Page 55: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/55.jpg)
The boards stack across and zero clearance
• For Maximum MOI about Z
• Batteries to outside for Shielding
5504/19/23APRS Global data network
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Chip Radiation Shielding?
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Epoxy Lead squares over critical chip dies
![Page 57: Bob Bruninga WB4APR US Naval Academy Satellite Lab bruninga@usna.edu Dr. Mirek Kasal OK2AQK Tomas Urbanec, P. Vágner Mike Ruprecht, DK3WN 2015 Smallsat.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649e235503460f94b11b0f/html5/thumbnails/57.jpg)
5704/19/23APRS Global data network
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QIKCOM-2 converts DTMF to both Voice and APRSand APRS data to voice!
With QIKCOM-2, not just APRS but DTMF data sources can be relayed among all users.
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The 324 Grid system has 99 grids…Position to 60 miles in 4 digits
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Standard Message communications (4 bytes)
• Since 1800’s for telegraph
• since1927 or so for radio
• Most of the time, most of what is said, has been said before
• Q2 has 99 messages and 99 modifiers
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Remember, lots of Space APS here on Earth
• STEM School projects
• Excite kids with Robotics
• Drive anywhere on Earth!
• Via APRS links
*http://www.arrl.org/marea-ham-radio-robotics