Houston Hamfest and BLT Team,
BLT-51 is thus far a HUGE SUCCESS! We are currently headed up or off the coast of South Carolina. Here are some telemetry explanations from Thomas KT5TK. Although the satellite count has gone to ZERO, we are still getting telemetry from BLT-51 via aprs.fi and tracking on W5ACM-10. You can approximate the location via the raw packets page, and checking the qth of the last station that the beacon went through. Will the GPS data come back? We don’t know, but there is quite the possibility that it simply froze overnight, or lost the GPS antenna, etc. Watch for stations in the raw packets from the EU in 3-4 days! Andy W5ACM From: Thomas Krahn Sent: Sunday, March 24, 2019 6:33 PM To: Andy <[email protected]> Subject: Re: FW: [BVARC] [BLT] [Ham-Radio-Tech-Notes] BLT-51 Hi Andy, The definitions for the 5 APRS telemetry chanels are as follows: 1.) Vbat = Battery Voltage in Volts. I hope you have used a lithium AA battery (not AAA) The Pecan Femto tracker should work down to 1.2 V at least 2.) SiTemp = Temperature measured in the Si4063 transmitter chip in degrees Celsius (sorry forgot to change) 3.) ucTemp = Temperature measured in the micro controller chip in degrees Celsius (sorry forgot to change) 4.) TTFF = Time to first fix. How long does it take until the GPS receiver gets a (3D) position lock in seconds. 5.) Sats = Number of GPS satellites that were received to get the position lock. The equations can be seen on the APRS.fi Telemetry page: https://aprs.fi/telemetry/?call=W5ACM-10 <https://aprs.fi/telemetry/?call=W5ACM-10&date_start=2019-03-23+14%3A00%3A00> &date_start=2019-03-23+14%3A00%3A00 Congrats on the launch and Hamfest from Berlin! 73 Thomas On 3/24/19 23:38, Andy wrote: Telemetry definitions? Ah! Touring up the East Coast! Andy From: BVARC [mailto:[email protected]] On Behalf Of john Parmalee via BVARC Sent: Sunday, March 24, 2019 4:48 PM To: [email protected] <mailto:[email protected]> Cc: john Parmalee <mailto:[email protected]> <[email protected]> Subject: Re: [BVARC] [BLT] [Ham-Radio-Tech-Notes] BLT-51 It looks like 51 want's to visit a couple more states before it goes over the pond. Now in South Carolina. Weather looks clear ahead with a forecast of a wind direction of ENE 75 degrees. Maybe it is going to take the great circle route to Europe. Andy please explain a couple of the telemetry graphs. Vbat in volts , got it. That little AAA battery is doing it's thing SI temp and Uc temp, in degree C; they track close but not exact, what are they? TTFF in seconds ?? Channel 5 doesn't seem to have a value or name. I know I can change the value designators. John Parmalee [email protected] <mailto:[email protected]> 281-380-3811 K5VGM WI2XLJ
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