multi-mode transmitter for balloons
Post on 31-Dec-2015
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1
Multi-Mode Transmitter for Balloons
2
Multi-Mode Transmitter
MODES
• Hellscreiber• RTTY• DominoEX• SSTV• CW• APRS (soon)
• Onboard GPS
• In/Out Temp
• Battery monitor
• 1 W on HF
• 0.3 W on VHF (FM or SSB) Frequency Agile from 3.5 MHz to 148 MHz
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MMT schematicA
A
B
B
C
C
D
D
E
E
1 1
2 2
3 3
4 4
(REMOVE R14 for pass ive)
ANT 1 is PASSIVE (REMOVE if active)
Jump if TTL GPS
to Garmin GPS
Vin
GND
Vout
U6
Vin
GND
Vout
U712
J3
C9 C10 C11
+3.3+5V+12V
C12 C13 C14 C15
D3
12
J4 D4
2-A2GPS232
2-A2GPSINV
2-A2GPSTTL
Inventek GPS
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
U8
4.7k
R9
+3.3
0.1C6
+3.3
JP2
1
2
3
JP3
1234
J6
0.1
C7
33
R10
33
R11
27p
C827pC16
1
TP1
1
TP2
R12
R13
C17 C18
123
J7
27pC19
33nH
L5
+3.3
0
R14
ANT1
1
TP3
TXB
TXA
RXB
RXA
4
MMT schematicA
A
B
B
C
C
D
D
E
E
1 1
2 2
3 3
4 4
GPS
123 4
56
16.386M VCXO
U3
27262524
188
16
151319
14
1211107
652321
203
2228
CY8C29466 U4
+3.3
+3.3
+3.3
16
1213
3
1
211
14
15
4 CY22393U5
R1 R2 R3 R4
+3.3
C4
R5
R6
12345
J2
1
2
3
JP1
R7
R8 LM61
1 2 3
U1
+3.3
2N3866A
Q1
L1
L2
+12V
C1
123
J1
+12V+3.3
1-E3GPS232
1-E3GPSINV
1-E3GPSTTL
1 2 3 4
5 6 7 8
ASDX015A24R
U2
+5V
L3
C2 C3
1
2
J5
C5
L4
5
Multi-Mode TransmitterInventek GPS
- Built-in helical antenna- Battery backup- For hot starts <1s- TTL or RS-232 outputs
MMT-XMT
- Multi Mode XMT
-Can be used with any GPS (TTL or RS-232)- Serial output for Zigbee or Maxstream 9Xtend
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MMT Hellscreiber transmission
• On/Off keyed mode
• 8.163 msec per pixel
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DominoEX mode• MFSK mode
• 18 tones
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dl-Fldigi • UKHAS mod called dl-FLdigi for uploading data to SpaceNear.us server
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Spacenear.us/tracker website
Displays positions decoded by dl-FLdigi onto a Google Map with chart and telemetry display box
- Designed by members of the UKHAS group
- Ground stations receiving telemetry are shown as towers
- Parachute comes out during descent
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Spacenear.us/tracker website
- Shows landing prediction in real-time (light blue target)
- - Can also upload chase car position directly to server via a wireless cellular link
Telemetry must be uploaded in the following format:$$callsign, sequence, time(UTC), lat, lon, alt(m), sats, batt, temp*<cksum>
$$WB8ELK,128,17:25:00,3441.03,-08554.20,26771,08,8.52,-9*7F
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Camcorders for balloons• Hobbypartz $59 thumbdrive camcorder
Tachyon XC helmetcam
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915 MHz telemetryMaxstream (Digi) 9Xtend
- 1 Watt output- 9600 baud or 115k baud- Long range with yagi on ground
- Up to 100 mW out- 900 and 2400 MHz versions- Great for wireless comms
between payloads- With a high-gain yagi it’s possible to directly link up to the balloon during flight
Digi XBee Pro XSC
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915 MHz telemetry
- Serial data from the MMT-XMT is sent to the XBee Pro for payload to payload comms or directly to the ground
- Ground station end showing XBee Pro mounted to the back of an 8 dB patch antenna
Digi XBee Pro
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915 MHz telemetry
- For improved range and better pattern directly below the balloon you can use a “Nanowheel” antenna by Olde Antenna Labs (sold by www.hamtv.com)
- 900 MHz rubber duck shown for size comparison
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Remote control your ground station• Logmein.com
Control your radio with:
Fldigi
Ham Radio Deluxe
MixW
MultiPSK
Remotely log
Onto your
Computer via
Logmein
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Hardware control – Iobridge.com • Controls relays and sensors via Ethernet/Web
connection
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Hardware control – Iobridge.com • Internet-controlled AZ/EL Rotor via the Iobridge interface
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Field Day Balloon 2010
- Predicted a landing on top of the Huntsville Amateur Radio Club’s Field Day site
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Field Day Balloon 2010
Huntsville Amateur Radio Club members watch as the balloon parachutes down directly across their field day site
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Field Day Balloon 2010
Missed landing on the HARC Field Day site by 0.75 miles
Landed right in the middle of Lady Ann Lake
Field Day location
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Field Day Balloon 2010
A conveniently placed kayak saves the day
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