14:08 UTC
wg9xfc-x d5407
wg9xfc-x e8268
wg9xfc-x a8.33

15:46 UTC
wg9xfc-x d5407
wg9xfc-x e8268
wg9xfc-x a8.32

11:15 UTC wg9xfc-x e4791

12:44 UTC wg9xfc-x a8.34
12:47 UTC wg9xfc-x d2871
12:51 UTC wg9xfc-x e4791

14:23 UTC wg9xfc-x d2871
14:26 UTC wg9xfc-x e4791
14:30 UTC wg9xfc-x a8.33

437.006 MHz FM CW
15:37 UTC wg9xfc-x a7.61 -> battery voltage
15:40 UTC wg9xfc-x d1125 -> rx counter
15:44 UTC wg9xfc-x e1000 -> tx counter
15:47 UTC wg9xfc-x a7.57

17:16 UTC wg9xfc-x d1125
17:18 UTC wg9xfc-x e1000
17:22 UTC wg9xfc-x a7.49

18:53 UTC wg9xfc-x e1079
87:56 UTC wg9xfc-x a7.38

437.007 MHz beacon interval ~ 3.2 minutes

ARDUSAT-X
1 39414U 98067DC  13356.74920503  .00082618  00000-0  11715-2 0  1038
2 39414 051.6511 253.3719 0007381 155.5086 260.1158 15.55704014  5067

14:57:45 UTC wg9xfc-x e505
15:00:58 UTC wg9xfc-x a8.33
15:04:13 UTC wg9xfc-x d468

16:33:16 UTC wg9xfc-x e505
16:36:27 UTC wg9xfc-x a8.34
16:39:39 UTC wg9xfc-x d468

17:40 UTC CW, FM
wg9xfc - 1 do
wg9xfc - 1 eo
wg9xfc - 1 a7 - 11

ARDUSAT-1
1 39412U 98067DA  13356.75946265  .00081267  00000-0  11559-2 0  1035
2 39412 051.6508 253.3310 0006443 155.4610 310.8721 15.55634598  5156

What kind of modulation is the signal behind the FM CW signal?

Dear Mike,
My hypothesis for the funny spectrogram for ArduSat FM CW is the following:
These guys are synthesizing the CW audio wave fed to the FM modulator.
The audio wave is sine – DC – sine – DC …
So, whatever phase there is at the end of the CW tone, that will produce a DC value until the next tone carries on.
What I don’t yet understand is why all those DC values are positive (resulting in an FM carrier above Fc). Need to check the software for this last one.

Best regards,
Juan (from Uruguay’s ANTELSAT team)

07:35 UTC  Information from UB4UAD   received JA0CAW
beacon interval 3 minutes 10 seconds

07:36:10 UTC  WG9XFC-1 E0
07:39:20 UTC  WG9XFC-1 A6.74
07:42:30 UTC  WG9XFC-1 D0

 

Received the beacon with a Simple Yagi antenna.

received beacons from UB4UAD, VK5HI, BX1AD, DK3WN

01:42 UTC WG9XFC-1 D16
01:52 UTC WG9XFC-1 D16
01:55 UTC WG9XFC-1 E16
01:58 UTC WG9XFC-1 A7.27
03:14 UTC WG9XFC-1 A7.08
03:17 UTC WG9XFC-1 D16
04:50 UTC WG9XFC-1 A7.09
04:53 UTC WG9XFC-1 D16
05:22 UTC WG9XFC-1 D16
05:25 UTC WG9XFC-1 E16
05:28 UTC WG9XFC-1 A7.21
06:19 UTC WG9XFC-1 D16
06:22 UTC WG9XFC-1 E16
06:25 UTC WG9XFC-1 A7.05