QRP Labs U4B-13

Details
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U3S

Live tracking
Launch photos
Transmitter

This is the 13'th test flight of the new U4B tracker. For details see below.

Live tracking

This is a new tracking program, being tested:

Launch photos

Pending

Transmitter

This is the 13'th test flight of the new U4B tracker. U4B-13 was assembled by Dave VE3KCL. This YouTube video explains the features of the U4B tracker. 

BASIC

This is the BASIC listing of U4B-13:

5 LET C = 44
6 PRINT BT
7 IF BT < 2850
8 SLEEP 10 1
9 GOTO 6
10 ENDIF
12 LET FR = 26999800    *set txco start freq
13 OUT 7 0            * turn off load (precaution)
   OUT 9 0                  * turn off led
   GPS 304 "$PSIMNAV,W,3*3A"        * send gps high alt string
   OUT 9 CL                 * turn on led if gps locked
15 PRINT BT
16 OUT 7 1             * turn on 220 ohm resistor 15ma with 8ma overhead load 23ma
17 FOR T = 1 TO 5   * read battery 5 times to get stable voltage ( maybe not required)
18 PRINT BT
19 NEXT
20 IF BT > 3500        * If battery under load is > 3.5v use high power changed for 7 solar cells 
21 LET I = 1
22 GOTO 25
23 ENDIF
24 LET I = 0                *If battery under load is < 3.5v use low power
25 OUT 7 0               * turn off load
30 SLEEP 10 3             * sleep till minute 3         sleep is 4.6ma
31 OUT 9 0                 * turn off led before tx
41 CW 0 14096050 12 0 " VE3KCL"         
42 CW 0 14096920 5 0 "*019630  990590573*"
43 CW 0 14096920 5 0 "*01IFLCNAP8Q7R65S0S0S5R6R7Q8PANCLFI*"
44 TELE
47 HELL 0 14096920 16 8 "QRP"
50 GOTO 12

Photos

The same U4B board is used as in previous flights. 

Pending