DSLWP-A / Longjiang-1
BJ1SM
Downlink
- Frequency
- 435.425 / 436.425 MHz
- Antenna
- 2 × shortened monopole, 90° mounted
- Polarization
- Linear
- Modulation
- 250/500 bps GMSK with or without precoder
- JT4G
- Channel Coding (for GMSK)
- 1/2 or 1/4 Turbo code
- Randomizer (for GMSK)
- CCSDS
- Sync Word (for GMSK)
- 0x034776C7272895B0 (1/2 Turbo)
- 0x034776C7272895B0FCB88938D8D76A4F (1/4 Turbo)
- Power
- 33 dBm
Uplink
- Frequency
- VHF
- Antenna
- 2 × shortened monopole, 90° mounted
- Polarization
- Linear
- Channel Coding
- (7, 1/2) convolutional + (255, 223) RS
- Modulation
- 250 bps GMSK
- DSSS-2FSK
DSLWP-B / Longjiang-2
BJ1SN
Orbiting moon since 25 May 14:08 UTC!
Downlink
- Frequency
- 435.400 / 436.400 MHz
- Antenna
- 2 × shortened monopole, 90° mounted
- Polarization
- Linear
- Modulation
- 250/500 bps GMSK with or without precoder
- JT4G
- Channel Coding (for GMSK)
- 1/2 or 1/4 Turbo code
- Randomizer (for GMSK)
- CCSDS
- Sync Word (for GMSK)
- 0x034776C7272895B0 (1/2 Turbo)
- 0x034776C7272895B0FCB88938D8D76A4F (1/4 Turbo)
- Power
- 33 dBm
Uplink
- Frequency
- VHF
- Antenna
- 2 × shortened monopole, 90° mounted
- Polarization
- Linear
- Channel Coding
- (7, 1/2) convolutional + (255, 223) RS
- Modulation
- 250 bps GMSK
- DSSS-2FSK
Telemetry Decoder
Source Code and GRC flowchart based on GNU Radio
https://github.com/bg2bhc/gr-dslwp/
Tracking Files
https://github.com/bg2bhc/dslwp_dev/
Linux Live CD
ISO File (20180530)
https://drive.google.com/file/d/1Ptga7XfgQ--qsnD4QhpNiRRUIW3c626L/
ISO File (20180620)
https://drive.google.com/file/d/1AD4lvie4L4Adx8AzrIiXULrvnLetnR1E/
https://share.weiyun.com/5SBV912
User Manual
https://github.com/bg2bhc/dslwp_dev/blob/master/dslwp_live_cd_user_manual_20180604.pdf
VLBI
First test on 10 Jun 2018
Data from Beijing 12m dish
https://drive.google.com/file/d/1I4N9-1FYAYp8YRuI_WW49Hud1-vvDF4k
Data from Dwingeloo 25m dish
https://charon.camras.nl/public/dslwp-b/
Successful Configurations
Here is a collection of configurations of radio amateurs who have successful DSLWP downlink reports. Please contact bg2bhc#gmail.com for any update.
PY4ZBZ
- 10 el yagi 15 dBi, homemade preamp 0,5dB NF
- The third radio amateur to catch the UHF downlink of DSLWP.
- 20 May: Found trace on waterfall but decoding is not successful with RTL-SDR + LiveCD,
- 16 Jun: Found trace on waterfall but no trial for decoding with FunCubeDongle pro.
- 23 Jun: Successful JT4G decoding.
N6RFM
- Custom “Alaskan” solid element Arrow antennas
- SP-70 preamp
- 28 meters 1/2 inch hardline
- AirSpy SDR, gr-dslwp, Linux Mint 18.3
- The fourth radio amateur to catch the UHF downlink of DSLWP
- Successful decoding until 21 May 2018 02:40 UTC, then UHF transmitter is turned off. Max range ~ 69500 km
- 14 Jul: Successful JT4G detection with algorithm by EA4GPZ
- 15 Jul: Successful JT4G decoding with IC-910 and audio via SignaLink USB
N6RFM - New Setup
- M2 432-9WL (28 elements) reported 19.4 dBd gain
- 4 meters LMR600
- 430 - 440 MHz <0.15dB Bandpass Filter (www.antennas-amplifiers.com)
- LNA4ALL in metal enclosure (~ 0.5 dB NF, 23.5 dB gain reported)
- 6 meters LMR400
- Airspy SDR
- Successful GMSK decoding for both B0 and B1 on 4 Aug and 5 Aug
B1/BY2HIT
- Old 12m C-band dish for INMARSAT TT&C in Shahe, Beijing. Modified by BY2HIT team for UHF and S-band reception.
- VK3UM feed phased for circular polarization, then DCI-435-10C band pass filter, and SP-70 preamplifier.
- USRP B210 SDR with onboard GPSDO for time and frequency reference.
- First decoding on 23 May 12:20 UTC, ~321500 km.
- 2 Jun 22:00 UTC, first decoding after lunar orbit insertion.
DK3WN
- MASPRO 435HS20 2x20 el-X Yagi, 13.2 dBD RHCP
- SP-7000 ssb-electronic 20db/0.9
- 15 mtr H2000-Flex coax
- 8 Jun: FT-736R + SDR-IQ (IF 13.68 MHz). Found trace on waterfall on but no trial to decode.
- 10 Jun: FT-736R + SDR-IQ (IF 13.68 MHz), Airspy and RTL-SDR. Airspy IQ recordings successfully decoded with the help of EA4GPZ.
- 11 Jun: 23/25 B1 beacons decoded with RTL-SDR.
- 16 Jun: Successful JT4G and GMSK decoding
- http://www.dk3wn.info/p/?cat=485
- Great thanks for the windows decoding software!
EA4GPZ
- 7 el Arrow yagi, gain 11dBi, G/T -20dB
- FUNcube Dongle Pro+
- 22 Jun: Successful detection of B0 JT4G with special detection algorithm http://destevez.net/2018/06/dslwp-b-detected-with-7-element-yagi/
- Great thanks for the continuous idea and support!
PA0DLO
- WHS32N 2x20 el x-yagi
- SP7000 preamp
- FCD Pro+, GQFRX, WSJT-X
- Successful JT4G decoding on Jul 14
20 thoughts on “DSLWP Radio Info”
Sent my reception report, IV3CYF Roberto