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ARBONET. ARBONET. “A poor man’s space program” Primarily funded and spear-headed by: Doug Loughmiller – W5BL Michael Willett – K5NOT With support from several enthusiastic individuals and clubs . ARBONET. Local Clubs Involved with ARBONET:

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ARBONET

  • “A poor man’s space program”

    • Primarily funded and spear-headed by:

  • Doug Loughmiller – W5BL

  • Michael Willett – K5NOT

    • With support from several enthusiastic individuals and clubs


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    ARBONET

    • Local Clubs Involved with ARBONET:

    • North Texas Balloon Project (mentors / chasers)

    • Red River Valley Amateur Radio Club (NE TX)

    • Fannin County Amateur Radio Club (NE TX)

    • Lockheed Amateur Radio Club – Ft. Worth

    • Richardson Wireless Klub (guest payloads)

    • Irving Amateur Radio Club


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    Adventures:

    GPSL-2009

    Aka: Which way did it go?


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    ARBONET

    GPSL 2009

    Arrived with payloads ready and willing to go flying, but….

    Became “enlightened” by Bill Brown… “ The Copernicus GPS has issues and settings you need to address…”

    We did not drive all the way up here to sit on the sidelines…. So we flew anyway!

    We thought we would at least have Lat / Long… And…. After the radio batteries were depleted…..


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    ARBONET

    Our payload was found a week later in grazing land by ranchers in Redland, KS.

    After reward money and postage, the payload came back to Texas!

    During the recovery, Doug and I never laughed so hard, making fun of the female voice beacon who talked a lot and yet said so little!


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    ARBONET

    29,616 ft

    Last Valid GPS

    Data Point

    Max altitude obtained estimated by Bill Brown WB8ELK as about 110,000 feet


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    ARBONET

    GPSL 2009 Flight Configuration

    Balloon

    Manifold

    Pressure Sensor Feed

    Electronics

    Valve (closed for this flight)

    Parachute

    (Intended to be closed for flight)


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    6 Minute Video

    ARBONET flight at GPSL 2009


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    Interesting Data:

    Envelope Pressure


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    ARBONET

    P = F/A

    Where P = Pressure

    Where F = Force

    Where A = Area

    • If P is nearly static, F /A are not changing or equal in change

    • If P increases, F is increasing or A is decreasing

    • If P decreases, F is decreasing or A is increasing


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    ARBONET

    GPSL 2009 Flight Configuration

    Balloon

    Manifold

    Pressure Sensor Feed

    Electronics

    Valve (closed for this flight)

    Parachute

    (Intended to be closed for flight)


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    ARBONET

    Pressure Sensors:

    Measured Pressure = Ambient Pressure

    More Pressure

    Diaphragm

    Diaphragm

    Ambient Air

    Ambient Air


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    ARBONET

    P=F/A

    Balloon

    Balloon

    Rs

    Diaphragm

    Diaphragm

    Ambient Air

    Ambient Air


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    ARBONET

    Internal Temperature

    Of Payload

    Pressure


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    ARBONET

    • We tend to think balloons behave in a linear fashion since the ascent is nearly linear. Thus a balloon that is getting bigger should have equal or more pressure…

    • We found the behavior is not linear, but a balance of P=F/A that was not expected

    • Other factors also contribute – He impurities, point of measurement, etc.

    • The Latex stretching is not linear, and the “mechanical maximum” (ability to contain the gas within) has a limit that is recognizable just before burst!


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    ARBONET

    This area may actually become a vacuum per similar results from

    U of MN students

    ARBONET

    Envelope Pressure relative to ambient

    (not calibrated )


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    ARBONET

    To modulate the optimum envelope pressure, we need to detect and remain in this region

    Envelope Pressure relative to ambient

    (not calibrated )


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    Possible Flight Profile

    Phase 5

    Hover

    Phase 6

    Deflation and

    Return via

    Balloon

    Phase 4

    Ascent

    80K-100K ft

    Phase 3

    Sense return of

    Positive pressure

    Trend and Modulate

    Pressure

    ALTITUDE

    Phase 6

    Return to Hover

    (Dump Ballast)

    Phase 2

    Ascent

    Phase 7

    Recovery

    Phase 1

    Launch

    RDF Tone

    TIME


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    ARBONET

    • How envelope modulation may be used:

    • Hang a balloon for longer-term, high-altitude experiments, re-call it when desired

    • A repeater in the sky for long periods of time

    • Controlled descents and with ballast, possible controlled landings by chase team

    • Gain higher altitudes, even though the ft/min is constantly decreasing after maximum expansion, you are still climbing for many minutes!

    • Note: Likely venting issue if in the zero pressure region!


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    ARBONET

    Project 1:

    New Voice Beacon Payload


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    ARBONET

    • The new voice beacon payload:

    • Same lost blonde-sounding women’s voice we all love.

    • Inventek GPS with Sarantel antenna

    • 0.3 PSI rated pressure sensor (higher precision)

    • Embedded repeater via 70cm and 2m radios

    • Built in USB for log retrieval and troubleshooting

    • DS1822 Digital thermometer Internal and External

    • Sensiron Thermometer and humidity measurement device

    • 2Mb to 4Mb logging memory capacity

    • Separate, controllable power busses for almost all electronics to reduce power consumption

    • All on a 3.8 x 2.5 double-sided board


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    ARBONET

    • ARBONET VOICE BEACON Design Team :

    • Patrick Whitfill, Firmware Guru / Operational Aspects

    • Michael Willett, K5NOT, Systems design, Hardware design and JOAT


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    ARBONET

    The new voice beacon main board:


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    ARBONET

    The new voice beacon main board:

    Voice Synthesizer

    (Backside)

    Analog In

    and Servos

    70cm

    Antenna

    Pgm Hdr

    USB Hdr

    70 cm radio

    (backside)

    Pressure Sensor

    CPU and

    memory

    USB Chip

    (backside)

    Power In

    GPS

    Open Tracker SMT

    2m

    Antenna

    2m radio

    (backside)

    Each section uses Power Control


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    ARBONET

    The new voice beacon main board:



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    ARBONET

    Project 2:

    Slow Scan TV Module


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    Doug Loughmiller, W5BL – ARBONET

    GPSL 2010 Hutchinson, KS

    July 23rd, 2010

    ARBONET

    A look at the OE1RIB Embedded Mobile SSTV for use in High Altitude Balloon Flights


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    Design Credit

    ARBONET

    The concept, design and implementation of the Mobile Embedded SSTV System is 100% the result of the efforts of Richard Prinz, OE1RIB who has graciously made his design materials available to W5BL for use on upcoming ARBONET flights.

    Doug’s efforts have simply been to identify Richard’s work and to promote his design as a viable solution for a low power, low cost, portable SSTV solution suitable for use as a payload on High Altitude Balloon Flights..


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    Image Options for High Altitude Balloon Flights

    ARBONET

    • ATV

      • Platform Stabilization, limited ground stations

    • Digital Photography / Digital Video

      • Excellent Images, but can only be viewed post flight

    • SSTV

      • Excellent Image quality, downlink in near real-time, easy ground station solution with receiver, lap-top and shareware





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    A Novel Home-Brew Solution

    ARBONET

    • Original Article

      Appeared in “Funkamateur” 8/2007

    • OE1RIB Web Site: http://www.min.at/prinz/oe1rib/SSTV/#Purpose


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    Features of The Universal Mobile Embedded SSTV System

    ARBONET

    Supports Black and White or Color Images Using Martin 1 with either 320 x 240 or 320 x 256 pixels

    Supports SSTV VIS code, Optional CW station ID

    Multiple transmissions of a captured image or single transmission of multiple images

    Battery backed Real-time clock for time and date display on image or via CW


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    ARBONET

    Built-in temperature sensor in image display or via CW

    In-circuit Programmable

    User defined Font Editor For Status Text Messages

    Configurable via RS-232 Port using HyperTerm-like serial programs

    Small Form Factor

    Light Weight



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    Circuit Details

    ARBONET

    Microprocessor = Microchip PIC18F458

    Video Buffer= AverLogic AL422B

    Real Time Clock= Maxim DS1307

    Temperature Sensor= Microchip TC74

    Camera= Sander/ ETC CAM-C3188A

    Low Power System operates at 100 mA during image capture and transmission , 90 mA at idle.


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    Construction

    ARBONET

    • Almost all parts are readily available through catalog distributors (Mouser, Digi-key etc.)

      • Exceptions: Averlogic Frame Buffer, Maxim MAX1818 and Sanders Camera

    • Boards can be obtained through ExpressPCB

    • Software downloadable from the Web site

    • Some surface mount components


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    Conclusion

    ARBONET

    Ideal Solution for BalloonSat Operations

    Thanks to Richard, OE1RIB for Sharing his design

    Stay Tuned for Images from Upcoming ARBONET flights.

    www.arbonet.net



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