This is the fourth test flight of the new U4B tracker. For details see below.
U4B-2 was launched by Dave VE3KCL on 24-Mar-2020 from Toronto, Canada
U4B-4 was awake again today. The balloon glyph of U4B-4 was copied by TA4/G0UPL in KM46
U4B-4 woke up again today over Southern Spain. The screenshot below shows Andy G0FTD's screenshot of the balloon glyph
U4B-4 is still flying, just not very talkative... it switched on today. The screenshot below shows Vernon VE1VDM's hat-trick, he copied U4B-4, U4B-6 and U4B-8 glyphs all at the same time!
U4B-4 continues to fly, and manages to switch on from time to time. One of those days was May 3rd!
Laurence KL7L in Alaska US, copied U4B-4 very strongly as it passed by South of him, see below photos including the Balloon Glyph which was first introduced in U4B-4. The YouTube video below shows even the CW Ident audible.
U4B-4 has some kind of tracker problems, probably relating to the locking up early in the morning when solar panel power generation is still low. U4B-4 is showing up occasionally here and there, from time to time. On 26-th April, it showed up near the Kamchatka peninsula (Russia), North of Japan. The below NOAA projection shows it likely to move only at low speed around the area.
This is the third test flight of the new U4B tracker. U4B-3 was assembled by Dave VE3KCL. This YouTube video explains the features of the U4B tracker.
This is the BASIC program being run on the U4B-4 flight computer:
5 LET C = 33 10 PRINT BT 11 IF BT < 3200 12 SLEEP 10 1 13 GOTO 10 14 ENDIF 15 LET FR = 26999980 20 OUT 9 0 25 GPS 300 "$PSIMNAV,W,3*3A" 26 OUT 9 CL 28 SLEEP 10 1 30 PRINT BT 32 IF BT > 3800 33 LET I = 1 34 GOTO 40 38 ENDIF 39 LET I = 0 40 CW 0 14097260 12 0 "_VE3OCL" 42 CW 0 14096960 5 0 "*01IFLCNAP8Q7R6R5S0S0S5R6R7Q8PANCLFI*" 43 CW 2 14097260 3 6 "*130*" 55 TELE 60 GOTO 15