09-18-2012, 08:10 AM
It's indeed a challenge to design circuitry to function at temperature extremes. In my career, we had to design to -65 deg C operation, but our applications were all terrestrial based: we could ramp the testing temperatures up, or down, very slowly, over a span of hours. WB9SBD faces a tougher challenge in that his low temperatures change rapidly as the balloon ascends (thermal shock). Add to that big humidity changes as the balloon goes up and low air pressures at high balloon altitudes, and the design gets even tougher. You can design a circuit that will work perfectly at room temperature, but there is always an environmental point where it will quit working. The component that causes the circuit to fail could be something as complex as an I.C., or as simple as a tiny capacitor.
Originally Posted by WB9SBD
Last edited by N5AL; 09-18-2012 at 08:15 AM.
09-18-2012, 04:17 PM
I don't know why anyone would knock playing with balloons and radios with all the fun that is bound to be.
In the meantime, I scanned through comments etc. and don't see any mention of locating the balloon; any progress in that department?
Won't it show up sooner or later (e.g. gets to a lower altitude and begins to function once more)?
K5CO, Rob in New Mexico
09-18-2012, 04:25 PM
I for one think this is really cool! I found the NSS website and monitored the launch. My antenna here in Oshkosh is poor but I was able to decode a few packets. Thanks for sharing and letting us all be part of these experiments.
I still turn on the radio now and then. With the dial on 10.14575 I still pick up something every 10 minutes or so. It almost looks like an RTTY signal that loses power about a 2 second into the transmission. Is it likely this is the balloon?
09-18-2012, 06:30 PM
We hope that is the case. But right now I am thinking that it has landed somewhere, now where is a good question. It is either water, or ground based but with the solar panel facing down, or the cold not only froze the electronics, but damaged them to not running.
Originally Posted by K5CO
It has to have landed in an un populated area, because the flight system is soo large that if people are anywhere near it ,, it will be seen, So my guess is in a rural or farming area. It's next hope for recovery is harvest time or hunting time and someone comes across it.
09-18-2012, 06:31 PM
I possibly could be, can you make a recording of it and send it to me?
Originally Posted by KE5RHE
09-19-2012, 02:08 PM
Originally Posted by AA1MN
Blather, blather, blather
09-19-2012, 02:58 PM
I will do so next time I turn it on. I assumed that other people near me in Wisconsin could hear the same thing so I didn't bother trying yesterday.
Originally Posted by WB9SBD
09-19-2012, 05:14 PM
I listened all yesterday afternoon.....nothing but noise,s-9.Sorry...
09-22-2012, 12:44 AM
09-22-2012, 02:34 AM
Nope that is not it.
Originally Posted by KF5FEI