[aprssig] USNA Party Balloon Success!
noskosteve at yahoo.com
Sat Apr 28 17:00:57 CDT 2012
I agree, very clever. Can't wait to see the pix.
Sent from my Knight-Kit Crystal Set.
73, Steve, K9DCI USN (Vet) MOT (Ret) Ham (Yet)
I served during the cold war, so you can continue to be served a cold one.
Up to date APRS Beginner Guide - updated Oct-2011
Click 'APRS Beginner INFO' under Contact
Manage Radio Memories with an Excel Spreadsheet !
Click to tune. Click to capture Radio freq.
All Memories on one page. Cut, Copy, Paste, Print 'em, etc...
TM-D700 | TH-F6A | TS-2000 | Icom 706MkIIG
All PMs |Real-time & memories | Sat mems too | Loads Mem Tones!
More Details, Features and Downloads at:
--- On Sat, 4/28/12, Bob Bruninga <bruninga at usna.edu> wrote:
> From: Bob Bruninga <bruninga at usna.edu>
> Subject: Re: [aprssig] USNA Party Balloon Success!
> To: "TAPR APRS Mailing List" <aprssig at tapr.org>
> Date: Saturday, April 28, 2012, 2:28 PM
> > Will you provide any information
> on telecommand
> > and cut-down stuff for us technogeeks?
> It is clever I think. Pictures next week... a 10
> ohm 1/8th watt carbon film resistor makes an excellent
> REUSEABLE burn device for fishing line on about 6 to 8
> volts. But to this I added a little two-pin header
> socket in series. One string is tied to the resistor
> which burns it for release, but a second string is tied to a
> U shaped jumper in the 2 pin socket. When the first
> string is released, then all the load is on the second
> string and the jumper which is pulled from the socket.
> This cuts the circuit to the resistor AND gives you a
> telemetry data point that it is released.
> I was SO CONCEREND that a comand to the burn resistor (1 amp
> momentary draw for up to several seconds) might lock up the
> whole system due to a battery dip that I wouild not get the
> OFF command to then turn off the current to the resistor
> later (The resistor does not burn through, and is reuselable
> so you must have an OFF mechanism). And since each
> burn takes a sligtly different time, I would not trust an X
> second burn (though it might not hurt for Byonics to incldue
> a PULSE option in their command options like Kantronics
> The burn can take up to 10 seconds depending on the
> Ayway, then a telemetry input hooked to the same header lets
> you know when it is pulled.
> That cut-down, plus our use of ICE as a slow ballast release
> system I think are our contributions to the state of balloon
> art, though probably someone has done it before.
> Bob, WB4APR
> Bob, WB4APR
> aprssig mailing list
> aprssig at tapr.org
More information about the aprssig