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U3S

Live tracking
Launch photos
Transmitter

This is the 20'th test flight of the new U4B tracker. For details see below.

Callsign is VE3OCL, WSPR transmission on 20m, is minute :00 and telemetry in minute :02 and telemetry call 0x3xxx


Live tracking



Launch photos

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IMG_20210514_090505862.jpg IMG_20210514_090521294.jpg one_degree_transmission.jpg


Transmitter

This is the 20'th test flight of the new U4B tracker. U4B-20 was assembled by Dave VE3KCL. This YouTube video explains the features of the U4B tracker. 

BASIC

This is the BASIC listing of U4B-19:

 5 LET C = 32
 6 LET R = 0
 7 LET I = 0
12 LET FR = 26999800
21 LET R = R + 1
 IF R > 5
 LET I = 1
22 GOTO 25
23 ENDIF
24 LET I = 0
25 GPS 304 "$PSIMNAV,W,3*3A"
29 OUT 9 CL
30 SLEEP 10 8
31 OUT 9 0
33 CW 0 14096900 5 0 "*0196310000962    36396303  *"
34 CW 0 14096900 5 0 "*01963095058402 555 902906800 6819090815 *"
35 CW 0 14096900 5 0 "*01IFLCNAP8Q7R6R5S0S0S5R6R7Q8PANCLFI*"
 IF I = 1
 CW 0 14096920 1 0 " T"
 GOTO 44
 ENDIF
 CW 0 14096890 1 0 " T"
44 TELE
46 CW 0 14096900 10 0 " VE3OCL"
47 CW 0 14096900 12 0 " #LT #LN"
50 GOTO 12

VER.33   388 bytes
VE3OCL  14097015 -20
WSPR MIN 0  TELE MIN 2 chan3
idea is that it will try 5 at low power cycles then go to high power if it crashes the the tx counter RT is zeroed and it starts again 
FR came in at 792 and 799 so left at 26999800
problem with gps locking 
 New board from pcbway with 20uf runs for 6 seconds without losing ephemeris 
did have a problem with gps found some solder ball on the stm32 so factory reset and it seemed to work better  
MAY 9 2021

Photos

The same U4B board is used as in previous flights. Different solar panel arrangement with triangular shape and three faces to try to increase the operating hours by catching more sunlight near sunrise and sunset. 

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