The 'grab' function is one of the fundamental features of the pacsat broadcast protocol used by the original AMSAT 1990 microsats, uosats and many other since then. The concept is that your station records files that others have requested a download for so multiple stations don't have to request the same file. It is considerably more efficient than sending it over and over to specific stations. The details are in Jeff Ward's PhD paper when he was at UoS and are described in the paper he did for the Small Sat conference - I think in 1991.
Don't forget there is a scripting capability in WiSP that lets you establish what your station will request a download for, request a download on a priority basis, grab, and never record. Those can be established for files based on to or from callsign, file size, key words, file type, etc. It is very flexible. The details for how to use MSPE Equations are in the WiSP help file.
Jim
On 10/25/2017 7:54 AM, Robert Bruninga wrote:
I assume that GRAB means to simply capture the file if anyone else is downlolading it in the same footprint. But to not transmit any requests for fills...
Bob
-----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of Scott Sent: Tuesday, October 24, 2017 11:30 PM To: [email protected] Subject: [amsat-bb] WiSP "Grab" -vs- "Download" ??
Hi everyone.
I've done my best to figure out how to use parts of the WiSP software for FalconSat-3, but I've got a long way to go.
Searched online and found a few tips, but one fairly important aspect is how to flag the files in the directory listing.
I understand "Priority" download and "Never" download, but does anyone happen to know what "Grab" means in this context?
There are actually quite a few options availble besides those three, so if anyone would like to share pointers on this software, I sure would appreciate it.
73!
-Scott, K4KDR _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb