SuitSat Telemetry

---------------------------------------------------------------------
RUNNING TABULATION OF SUITSAT-1 TELEMETRY FROM N2SPI
---------------------------------------------------------------------

------ --- --- -------- ------- ----------- -------- ----------------
SuitSat SuitSat     SuitSat
N2SPI  Telemetry        Mission Temperature Battery   File name for
Update message heard @: Time in in Degrees  Voltage   source audio:
Number Mo  Day Time UTC Minutes Celsius     (Volts)   (".wav" file)
------ --- --- -------- ------- ----------- -------- ----------------
0      Feb   8 13:49:41  006607          12     26.-  8Feb1340z_telem
1      Feb   9 12:37:29  0--967          --     -6.7  9Feb1237z_telem
2      Feb  10 06:39:29  009-44          13     26.7 10Feb0639z_telem
3      Feb  11 07:04:41  010501          --     26.7 11Feb0704z_telem
4      Feb  11 11:50:53  010786          --     26.7 11Feb1153z_telem
5      Feb  12 05:52:34  01--62          14     26.- 12Feb0552z_telem
6      Feb  13 04:39:57  01-222          --     26.6 13Feb0439z_telem
7      Feb  13 06:18:18  --3320          14     2-.6 13Feb0618z_telem
8      Feb  14 05:05:24  0-4680          15     26.6 14Feb0505z_telem
9      Feb  15 03:52:54  016040          --     26.5 15Feb0348z_telem
10     Feb  16 04:18:32  0--49-          16     26.3 16Feb0411z_telem
11     Feb  17 03:05:45  ------          --     25.2 17Feb0300z_telem
12     Feb  17 10:59:42  0--3-9          15     18.3 17Feb1057z_telem
Pass1@ Feb  18 01:49:30          Nothing heard*
Pass2@ Feb  18 03:22:45          Nothing Heard
Pass3@ Feb  18 04:58:30          Nothing heard
Pass4@ Feb  18 06:34:30          Nothing heard --- Farewell SuitSat-1!
------ --- --- -------- ------- ----------- -------- ----------------

N2SPI Comment after update 12:
————–
As you can see, there is a noticeable acceleration in the rate of battery voltage change.

In approximately 24 hours, from update #9 to #10, it dropped only 0.2 volts. In the next (approximately) 23 hours (#10 to #11), it dropped 1.1 volts.

N2SPI Final Comment:
————–
*Note: As a test of my equipment, the 145.9 MHz downlink of HamSat (VUSat) came “blasting in” during its Feb 18 03:40 UTC pass.


E-mail received from Lou McFadin, W5DID
To those observing the Suitsat voltage, Those of us who had the opportunity to observe the Suitsat equipment up close while building it are following the voltage readings with much interest.

Your efforts to gather the telemetry data are very much appreciated and will contribute to further success should we get the opportunity to build a second Suitsat.

I am including with this e-mail, a chart of battery current vs battery voltage. The power system is designed to squeeze every drop of power out of the batteries that is possible.

As you will note the battery current will rise as the battery voltage drops. That is the power systems attempt to keep the transmitter voltage at 12V. As the battery voltage nears 12V, the regulator will no longer be able to maintain 12v output. At a battery voltage below 9V all transmissions will cease. The computer will continue to
operate down to 3V although with no transmissions, Suitsat will appear dead.
I expect this drop off to occur very rapidly.

We really appreciate the dedication and true amateur spirit of all those who have helped us monitor this unique and interesting Experiment.

Lou McFadin
W5DID
AMSAT BOD
ARISS US Hardware manager

 

Leave a Reply

Your email address will not be published. Required fields are marked *