Search found 996 matches

by Daniel Wee
Thu 09 Dec 09 2010 1:39 am
Forum: Space Balloon Project
Topic: Cygnus Module development
Replies: 20
Views: 55844

Re: Cygnus Module development

In the worst case scenario, we can expect the balloon to rise to about 40km altitude and 20km lateral translation, which yields the highest distance of about 45km LOS. We know from existing tests that 500mW on 433MHz can get us out to 30km with correctly polarized antennas. Perhaps a turnstile groun...
by Daniel Wee
Wed 08 Dec 08 2010 10:03 pm
Forum: Space Balloon Project
Topic: Scorpion Controller Board
Replies: 19
Views: 58750

Re: Scorpion Controller Board

Your board is going to be quite big from the looks of it. Do you have a target size?

Daniel
by Daniel Wee
Tue 07 Dec 07 2010 12:58 am
Forum: Space Balloon Project
Topic: Cygnus Module development
Replies: 20
Views: 55844

Re: Cygnus Module development

Cygnus will have an X-Mega A4 managing communications, and a dsPIC33F doing data logging. The current plan is to use a 1W 434MHz module as the main communications channel. This is an SPI local interface so it will need an enable line.

Daniel
by Daniel Wee
Mon 06 Dec 06 2010 11:12 pm
Forum: Space Balloon Project
Topic: Cygnus Module development
Replies: 20
Views: 55844

Sensor list

The list of sensors are as follows:- 1. External temperature sensor (IR sensor, MLX90614 I2C) 2. Internal temperature sensor (DS18B20, TMP100/101) 3. Board level temperature sensor (DS18B20 One-Wire) 4. GPS module (LS20031 MTK) 5. Primary battery voltage sensor 6. Secondary supply voltage sensor 7. ...
by Daniel Wee
Mon 06 Dec 06 2010 10:27 pm
Forum: Space Balloon Project
Topic: Cygnus Module development
Replies: 20
Views: 55844

Cygnus Module development

The Cygnus module will be one of the two function-duplicate systems (the other being Mark's Scorpion module) making up the payload. These systems will have mostly independent functions, sensor and communication systems. This will list some of the key features planned for Cygnus:- 1. Bi-directional d...
by Daniel Wee
Mon 06 Dec 06 2010 9:57 pm
Forum: Space Balloon Project
Topic: RF Links
Replies: 11
Views: 41541

Re: RF Links

The stated -110dBm is the receive sensitivity. I think you need to find out the output power.

Daniel
by Daniel Wee
Mon 06 Dec 06 2010 3:39 pm
Forum: Support
Topic: DragonOSD+ firmware upgrading
Replies: 140
Views: 289555

Version 16.1

Version 16.1

1. Fixed Wh calculation
2. Modified SWCHAN triggering slightly

Daniel
by Daniel Wee
Mon 06 Dec 06 2010 10:58 am
Forum: Support
Topic: DragonOSD+ firmware upgrading
Replies: 140
Views: 289555

Version 16.0

Version 16.0

1. Slight optimization to SWCHAN action

Daniel
by Daniel Wee
Fri 03 Dec 03 2010 6:29 pm
Forum: Space Balloon Project
Topic: Adhesives
Replies: 1
Views: 14561

Adhesives

I'm wondering how well various adhesives (including hot melt glue) would hold up under those extreme cold conditions. Will them simply freeze and crack? If so, what kinds of adhesives are safe to use?

Daniel