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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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arbonet2
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
arbonet3
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
slide4
Adventures:

GPSL-2009

Aka: Which way did it go?

arbonet5
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…..

arbonet6
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!

slide7
ARBONET

29,616 ft

Last Valid GPS

Data Point

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

slide8
ARBONET

GPSL 2009 Flight Configuration

Balloon

Manifold

Pressure Sensor Feed

Electronics

Valve (closed for this flight)

Parachute

(Intended to be closed for flight)

slide9
6 Minute Video

ARBONET flight at GPSL 2009

slide11
Interesting Data:

Envelope Pressure

slide12
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
slide13
ARBONET

GPSL 2009 Flight Configuration

Balloon

Manifold

Pressure Sensor Feed

Electronics

Valve (closed for this flight)

Parachute

(Intended to be closed for flight)

slide14
ARBONET

Pressure Sensors:

Measured Pressure = Ambient Pressure

More Pressure

Diaphragm

Diaphragm

Ambient Air

Ambient Air

slide15
ARBONET

P=F/A

Balloon

Balloon

Rs

Diaphragm

Diaphragm

Ambient Air

Ambient Air

slide16
ARBONET

Internal Temperature

Of Payload

Pressure

slide17
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!
slide18
ARBONET

This area may actually become a vacuum per similar results from

U of MN students

ARBONET

Envelope Pressure relative to ambient

(not calibrated )

slide19
ARBONET

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

Envelope Pressure relative to ambient

(not calibrated )

possible flight profile
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

slide21
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!
slide22
ARBONET

Project 1:

New Voice Beacon Payload

slide23
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
slide24
ARBONET
  • ARBONET VOICE BEACON Design Team :
  • Patrick Whitfill, Firmware Guru / Operational Aspects
  • Michael Willett, K5NOT, Systems design, Hardware design and JOAT
slide25
ARBONET

The new voice beacon main board:

slide26
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

slide27
ARBONET

The new voice beacon main board:

slide29
ARBONET

Project 2:

Slow Scan TV Module

doug loughmiller w5bl arbonet gpsl 2010 hutchinson ks july 23rd 2010
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

design credit
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..

image options for high altitude balloon flights
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
a novel home brew solution
A Novel Home-Brew Solution

ARBONET

  • Original Article

Appeared in “Funkamateur” 8/2007

  • OE1RIB Web Site: http://www.min.at/prinz/oe1rib/SSTV/#Purpose
features of the universal mobile embedded sstv system
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

slide38
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

circuit details
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.

construction
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
conclusion
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