I got this too. It could be FIS-B messages.
Try running something like this (Must be run as root if the log file is in/var/log)
rtl_sdr -f 978000000 -d 0 -s 2083334 -g 48.5 - | /home/pi/adsb-receiver/build/dump978/dump978 | /usr/bin/tee -a
/var/log/dump978.log | /home/pi/adsb-receiver/build/dump978/uat2esnt | /bin/nc -q1 w.x.y.z(or localhost) 30001 &
EDIT: Actually you will need something a little different
rtl_sdr -f 978000000 -d 0 -s 2083334 -g 48.5 - | /home/pi/adsb-receiver/build/dump978/dump978 | /usr/bin/tee -a
/var/log/dump978.log | /home/pi/adsb-receiver/build/dump978/uat2json /var/www/html/dump978/data/ &
Change dirs, dongle # and gain to suite local setup.
Then look at the logs. You can send a few into uat2text to see what they look like
pi@odroidxu4:~$ tail -5 /var/log/dump978.log | /home/pi/adsb-receiver/build/dump978/uat2text
HDR:
MDB Type: 2
Address: ACBDC7 (ICAO address via ADS-B)
SV:
NIC: 9
Latitude: +40.7758
Longitude: -74.5632
Altitude: 3050 ft (barometric)
N/S velocity: 156 kt
E/W velocity: 102 kt
Track: 33
Speed: 186 kt
Vertical rate: 0 ft/min (from geometric altitude)
UTC coupling: yes
TIS-B site ID: 0
AUXSV:
Sec. altitude: 2850 ft (geometric)
UPLINK:
Site Latitude: +40.6975 (possibly invalid)
Site Longitude: -74.1542 (possibly invalid)
UTC coupled: yes
Slot ID: 4
TIS-B Site ID: 6
INFORMATION FRAME:
Length: 43 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 8 (NOTAM (Including TFRs) and Service Status) - Text/Graphic
Product time: 12/17 15:55
Data: 82 10 2D 02 0C 00 08 2F 8B 20 01 2D 02 0C 00 00 …-…/. .-…
00 00 00 00 00 0F D9 00 0C 11 0F 37 0C 11 14 00 …7…
CA 7E E3 8B 50 00 .~…P.
INFORMATION FRAME:
Length: 43 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 8 (NOTAM (Including TFRs) and Service Status) - Text/Graphic
Product time: 12/9 13:00
Data: 82 10 2D 33 51 00 08 2E E1 20 01 2D 33 51 00 00 …-3Q… .-3Q…
00 00 00 00 00 0F D9 00 0C 09 0D 00 0C 17 15 00 …
CA E6 E3 9C 74 00 …t.
INFORMATION FRAME:
Length: 75 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 8 (NOTAM (Including TFRs) and Service Status) - Text/Graphic
Product time: 12/17 15:55
Data: 22 10 2D 02 0C 00 00 40 BE 2C 84 38 F5 01 36 D1 ".-…@.,.8…6.
20 2D 02 0C BB 1C AF C7 7C 60 C7 7C 75 D7 56 A0 -…|.|u.V. 85 02 0C 83 1C AF C7 7C 60 40 83 20 51 76 60 42 .......|
@. QvB 00 CC 4C 48 31 DB 1C B1 DF 1D 75 D6 DC 76 C7 2C ..LH1.....u..v., 77 CB 0C 30 78 00 w..0x. INFORMATION FRAME: Length: 102 bytes Type: 0 (FIS-B APDU) FIS-B: Flags: Product ID: 8 (NOTAM (Including TFRs) and Service Status) - Text/Graphic Product time: 12/17 01:25 Data: 22 10 2C 94 D0 00 00 5B BC D8 84 38 F5 01 36 D1 ".,.......8..6. 20 2C 94 D0 BB 1C AF C3 8D A0 C7 7C 31 CB 56 A0 ,.........|1.V. 84 94 D0 83 1C AF C3 8D A0 25 34 20 49 76 60 C3 .........%4 Iv
.
68 08 30 41 E0 41 33 A0 4C 91 CE 80 15 20 49 76 h.0A.A3.L… Iv
60 C7 08 0E 81 32 44 16 03 8F 52 03 07 50 48 31 `…2D…R…PH1
DB 1C B1 DF 0C 72 D6 DC 76 C7 2C 79 CB 1C 30 78 …r…v.,y…0x
00 .
INFORMATION FRAME:
Length: 118 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 413 (Generic Textual Data Product APDU Payload Format Type 2) - Text (DLAC)
Product time: 14:00
Report type: WINDS
Report location: ALB
Report time: 180000Z
Text:
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
2526 2646+04 2665+00 2660-04 2675-15 2685-30 760046 770553 771455
UPLINK:
Site Latitude: +40.6975 (possibly invalid)
Site Longitude: -74.1542 (possibly invalid)
UTC coupled: yes
Slot ID: 19
TIS-B Site ID: 6
HDR:
MDB Type: 0
Address: ACBDC7 (ICAO address via ADS-B)
SV:
NIC: 9
Latitude: +40.7764
Longitude: -74.5627
Altitude: 3050 ft (barometric)
N/S velocity: 156 kt
E/W velocity: 102 kt
Track: 33
Speed: 186 kt
Vertical rate: -128 ft/min (from geometric altitude)
UTC coupling: yes
TIS-B site ID: 0
UPLINK:
Site Latitude: +40.6975 (possibly invalid)
Site Longitude: -74.1542 (possibly invalid)
UTC coupled: yes
Slot ID: 20
TIS-B Site ID: 6
INFORMATION FRAME:
Length: 118 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 413 (Generic Textual Data Product APDU Payload Format Type 2) - Text (DLAC)
Product time: 14:00
Report type: WINDS
Report location: RDU
Report time: 180000Z
Text:
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
2345 2437+11 2435+05 2542+03 2662-13 2765-24 277740 278748 279055
INFORMATION FRAME:
Length: 118 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 413 (Generic Textual Data Product APDU Payload Format Type 2) - Text (DLAC)
Product time: 14:00
Report type: WINDS
Report location: CAR
Report time: 181200Z
Text:
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
2121 2358+02 2564-02 2684-06 7612-17 7521-30 764845 775653 774859
Here are a couple of SPECI and METAR decodes
INFORMATION FRAME:
Length: 81 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 413 (Generic Textual Data Product APDU Payload Format Type 2) - Text (DLAC)
Product time: 17:33
Report type: SPECI
Report location: KDAA
Report time: 171733Z
Text:
AUTO 17004KT 10SM BKN007 BKN110 01/00 A2993 RMK
AO2 CIG 007V110 BKN007 V SCT=
INFORMATION FRAME:
Length: 85 bytes
Type: 0 (FIS-B APDU)
FIS-B:
Flags:
Product ID: 413 (Generic Textual Data Product APDU Payload Format Type 2) - Text (DLAC)
Product time: 16:56
Report type: METAR
Report location: KISP
Report time: 171656Z
Text:
33003KT 3SM -RA BR SCT009 BKN016 OVC035 01/01 A2991
RMK AO2 SLP127 P0006 T00110011=
UPLINK:
Site Latitude: +40.6975 (possibly invalid)
Site Longitude: -74.1542 (possibly invalid)
UTC coupled: yes
Slot ID: 27
TIS-B Site ID: 6