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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.

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Presentation on theme: "ARBONET. “A poor man’s space program” Primarily funded and spear-headed by: Doug Loughmiller – W5BL Michael Willett – K5NOT With support from several."— Presentation transcript:

1 ARBONET

2 “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

3 Local Clubs Involved with ARBONET: North Texas Balloon Project (mentors / chasers)North Texas Balloon Project (mentors / chasers) Red River Valley Amateur Radio Club (NE TX) Red River Valley Amateur Radio Club (NE TX) Fannin County Amateur Radio Club (NE TX)Fannin County Amateur Radio Club (NE TX) Lockheed Amateur Radio Club – Ft. WorthLockheed Amateur Radio Club – Ft. Worth Richardson Wireless Klub (guest payloads)Richardson Wireless Klub (guest payloads) Irving Amateur Radio ClubIrving Amateur Radio Club ARBONET

4 Adventures: GPSL-2009 Aka: Which way did it go?

5 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….. ARBONET

6 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! ARBONET

7 29,616 ft Last Valid GPS Data Point Max altitude obtained estimated by Bill Brown WB8ELK as about 110,000 feet

8 ARBONET GPSL 2009 Flight Configuration Balloon Manifold Pressure Sensor Feed Electronics Valve (closed for this flight) Parachute (Intended to be closed for flight)

9 6 Minute Video ARBONET flight at GPSL 2009

10

11 Interesting Data: Envelope Pressure

12 ARBONET 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 P = F/A Where P = Pressure Where F = Force Where A = Area

13 ARBONET GPSL 2009 Flight Configuration Balloon Manifold Pressure Sensor Feed Electronics Valve (closed for this flight) Parachute (Intended to be closed for flight)

14 ARBONET Pressure Sensors: Measured Pressure = Ambient Pressure More Pressure Diaphragm Ambient Air

15 Diaphragm Ambient Air Balloon ARBONET P=F/A Rs

16 Pressure Internal Temperature Of Payload ARBONET

17 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! ARBONET

18 Envelope Pressure relative to ambient (not calibrated ) This area may actually become a vacuum per similar results from U of MN students ARBONET

19 Envelope Pressure relative to ambient (not calibrated ) To modulate the optimum envelope pressure, we need to detect and remain in this region ARBONET

20 Possible Flight Profile Phase 1 Launch Phase 4 Ascent Phase 2 Ascent Phase 6 Deflation and Return via Balloon Phase 7 Recovery TIME ALTITUDE RDF Tone 80K-100K ftPhase 3 Sense return of Positive pressure Trend and Modulate Pressure Phase 6 Return to Hover (Dump Ballast) Phase 5 Hover

21 ARBONET How envelope modulation may be used: Hang a balloon for longer-term, high-altitude experiments, re-call it when desiredHang a balloon for longer-term, high-altitude experiments, re-call it when desired A repeater in the sky for long periods of timeA repeater in the sky for long periods of time Controlled descents and with ballast, possible controlled landings by chase teamControlled 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!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!

22 ARBONET Project 1: New Voice Beacon Payload

23 The new voice beacon payload: Same lost blonde-sounding women’s voice we all love.Same lost blonde-sounding women’s voice we all love. Inventek GPS with Sarantel antennaInventek GPS with Sarantel antenna 0.3 PSI rated pressure sensor (higher precision)0.3 PSI rated pressure sensor (higher precision) Embedded repeater via 70cm and 2m radiosEmbedded repeater via 70cm and 2m radios Built in USB for log retrieval and troubleshootingBuilt in USB for log retrieval and troubleshooting DS1822 Digital thermometer Internal and ExternalDS1822 Digital thermometer Internal and External Sensiron Thermometer and humidity measurement deviceSensiron Thermometer and humidity measurement device 2Mb to 4Mb logging memory capacity2Mb to 4Mb logging memory capacity Separate, controllable power busses for almost all electronics to reduce power consumptionSeparate, controllable power busses for almost all electronics to reduce power consumption All on a 3.8 x 2.5 double-sided boardAll on a 3.8 x 2.5 double-sided board ARBONET

24 ARBONET VOICE BEACON Design Team : Patrick Whitfill, Firmware Guru / Operational AspectsPatrick Whitfill, Firmware Guru / Operational Aspects Michael Willett, K5NOT, Systems design, Hardware design and JOATMichael Willett, K5NOT, Systems design, Hardware design and JOAT ARBONET

25 The new voice beacon main board:

26 ARBONET The new voice beacon main board: Pgm Hdr USB Hdr Pressure Sensor Voice Synthesizer (Backside) Analog In and Servos 70cm Antenna GPS Open Tracker SMT 2m Antenna Power In CPU and memory 70 cm radio (backside) 2m radio (backside) USB Chip (backside) Each section uses Power Control

27 ARBONET The new voice beacon main board:

28 ARBONET

29 Project 2: Slow Scan TV Module

30 Doug Loughmiller, W5BL – ARBONET GPSL 2010 Hutchinson, KS July 23rd, 2010 A look at the OE1RIB Embedded Mobile SSTV for use in High Altitude Balloon Flights ARBONET

31 Design Credit 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.. ARBONET

32 Image Options for High Altitude Balloon Flights 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 ARBONET

33 ARBONET SSTV Activity ARBONET

34 What We Really Want To See! ARBONET

35 Commercial, Portable Off-the-Shelf SSTV Options are Limited ARBONET

36 A Novel Home-Brew Solution Original Article Appeared in “Funkamateur” 8/2007 OE1RIB Web Site: ARBONET

37 Features of The Universal Mobile Embedded SSTV System 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 ARBONET

38 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 ARBONET

39 System Image Using Martin1 ARBONET

40 Circuit Details 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. ARBONET

41 Construction 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 ARBONET

42 Conclusion Ideal Solution for BalloonSat Operations Thanks to Richard, OE1RIB for Sharing his design Stay Tuned for Images from Upcoming ARBONET flights. ARBONET

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