DSLWP Radio Info

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/

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.

PY2SDR

  • Homemade 4-element LFA (yagi) antenna
  • Low noise preamp
  • RTL-SDR + LiveCD
  • Catched the first signals from DSLWP-A at 2018-05-20 22:15 UTC and DSLWP-B at 2018-05-20 22:20 UTC by waterfall.
  • Successful decoding until 2018-05-21 02:35 UTC, then UHF transmitter is turned off. Max range ~67500 km.

 

 

CD3NDC

  • Arrow antenna model Alaskan, 10 el
  • RTL-SDR + LiveCD
  • The second radio amateur to catch the UHF downlink of DSLWP.
  • 20 Jun: Found trace on waterfall but decoding is not successful.

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

PY2ZX

  • K1FO Yagi 15 elements (15.9 dBi)
  • RSP1A
  • Found trace on waterfall on 20 May
  • https://www.youtube.com/watch?v=bxdhVUKtUMc

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.

BA7KW

  • 4 × 23 el DK7ZB yagi, helical filter and preamplifier on rooftop.
  • USRP B210 SDR with onboard GPSDO for time and frequency reference.
  • Found trace on waterfall on 23 May but decoding is not successful.

SP5ULN

  • 19 el yagi, LNA and RTL-SDR.
  • Found trace on waterfall and partial successful decoding (too many error bits) on 3 Jun, 8 Jun and 11 Jun.
  • Successful JT4G decoding on 16 Jun.

PI9CAM

  • Dwingeloo telescope, 25m dish antenna.
  • USRP B210 & RTL-SDR.
  • First GMSK decoding on 3 Jun.
  • Successful JT4G reception on 16 Jun but no trial for decoding.
  • Received first image frames on 4 Aug, shows Mars.
  • Great thanks to Cees, Jan PA3FXB, Harry PE1CHQ, Tammo and Paul!

M0IEB

  • 436CP42UG & SP70 432MHz Masthead Preamplifier, on the roof, 6m boom away from the roof top.
  • USRP SDR.
  • Found trace on waterfall on 3 Jun but decoding is not successful.

PA3FXB

  • 28 el DK7ZB yagi, horizontal polarization.
  • SSB electronics preamp with a NF of around 0.8 dB.
  • Fun Cube Dongle & SDR Console V3.
  • Found trace on waterfall on 5 Jun but no trial to decode.

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!

IW1DTU

  • 4x23 el yagi, horizontal polarization, theoric gain 23 dBi.
  • 0.5/30 dB LNA, 30m Aircom coax cable.
  • AOR-5000 receiver with GPSDO (Leo Bodnar) at 10 MHz and SDR-14 as panadapter.
  • 11 Jun: Found trace on waterfall but no trial to decode.
  • 16 Jun: Successful JT4G and GMSK decoding.

BG6LQV

  • Helix antenna, 10 turns
  • BU-435 preamplifier, FT857
  • 16 Jun: Successful JT4G decoding with WSJT-X 1.6.0

BD9BU

  • 2×13 el DK7ZB yagi
  • BU-435 preamplifier, FT-897D
  • 16 Jun: Found JT4G trace on waterfall but decoding not successful with WSJT 9.02
  • 19 Jun: Successful decoding with WSJT-X

G4RGK

  • 8 x 27el Yagis with Open Wire Feed system
  • 0.4dB NF MGF1302 Preamp
  • IC475 RX + WSJT9
  • Funcube + Map65
  • 16 Jun: Decoding not successful

4Z5CP

  • 4 × 16JXX70 antenna, homemade LNA ~0.3dB NF.
  • 16 Jun: Successful GMSK decoding with RTL-SDR, JT4G decoding not successful with TS-2000 and WSJT 9.

IU2EFA

  • Diamond A430S15, 15 el yagi 14.8 dBi, Yaesu G-5400B rotator
  • 13 mt of Hyperflex 10 cable, no preamplifications
  • Kenwood TS-790E Radio
  • 16 Jun: Successful JT4G decoding

JA0CAW

  • 14 el × 1(430M) Quad，homemade LNA (Mgf 1401 old FET), 5D2V(25M)
  • FT-847 + PC + WSJT 10
  • 16 Jun: Successful JT4G decoding

JA5BLZ

  • 16 Jun: Found JT4G trace on waterfall
  • 15 Jul: Successful JT4G decoding

BY2HIT

  • 8 × Diamond A430S10R yagi array
  • Helical filter, Mini-circuits ZRL-700+ LNA
  • USRP B210
  • 19 Jun: B0 JT4G not successful because of large frequency offset, but SNR should be enough. Successful B0 GMSK decoding after frequency offset fixed.

Wakayama University ifES Lab

  • 12m dish
  • DIY UHF Feed + LNA + BPF
  • USRP B210, onboard GPSDO
  • 19 Jun: Successful GMSK & JT4G decoding
  • Great thanks to Mr. Ma BG2KAJ, Prof. Akiyama, Mr. Kishiura JH3NYP, Mr. Morita JA3RVS and Mr. Ishihara JH3BUM!

SQ5KTM

  • 21 el V polarization F9FT yagi, RAS rotator
  • LNA MVV Wimo, IC-9100, PC, Win10
  • Successful JT4G decoding on 19 Jun

M0VKK

  • 4x18 Homebrew 18 Element Powabeam W718562 Horizontal
  • VHF Design 0.4dB preamp
  • Elecraft XV432+GPSDO, Flex1500, WSJT
  • Successful JT4G decoding on 22 Jun

IK8XLD

  • 1x21 el Yagi Horizzontal polarization
  • PRH430 Microset 20dB/1 dB Preamplifier
  • 35m H1000
  • TS2000 + SDR (RTL-SDR on 10.7 MHz second IF)
  • Successful JT4G reception on 22 Jun with WSXT 10.0

LU5EWR, LU8DQ, LU3DMB

  • 29 ely agi antenna, 20dBi,linear pol.
  • LNA: 20dB gain, 0.45 dB
  • SDR-Play2 with helical filter resonators
  • Jun 23: Moon at 60°. Found trace on waterfall but no trial to decode.

EA4GPZ

W2RTV

  • Gulf Alpha Antenna sitting on the ground
  • 75FT LDF 1/2 inch Hardline
  • 0.05 db 26 dbi gain LNA by High Sierra Microwave
  • ICOM IC-9100
  • Intel compute stick for PC
  • Successful JT4G decoding on 30 Jun

BG8IXQ

  • M2 436CP30, LNA, FT-857
  • Successful JT4G decoding on Jun 30

JA1OGZ

  • OSCAR Hunter LHC
  • LNA(20db-NF 0.7)
  • IC-910
  • Successful JT4G decoding on 1 Jul

YL3CT

  • 4x23el DK7ZB yagi, horizontal polarization
  • Home made preamp, NF 0.5 dB
  • KENWOOD TS-2000
  • WSJT10
  • Successful JT4G decoding on 30 Jun

I0LYL

  • antenna 21 elements horizontal / vertical polarization, manual control
  • LNA 22 dB 0,7dB NF homebrew
  • RTL2832U R820T
  • HDSDR Vers. 2.76a
  • WSJT vers. 10.0
  • Successful JT4G decoding on 14 Jul and 15 Jul
  • Successful GMSK decoding on 5 Aug including telemetry frames and image frames

SQ3SWF

  • 16el DK7ZB hand-tracked on a tripod
  • SPF5189z, FT-817 to laptop mic
  • Easy speaker copy but no decode
  • Recording decoding successful with help of SP5ULN

PA0DLO

  • WHS32N 2x20 el x-yagi
  • SP7000 preamp
  • FCD Pro+, GQFRX, WSJT-X
  • Successful JT4G decoding on Jul 14

K4KDR

  • 70cm X-Quad set at 45 deg. elevation on an AZ-only rotator
  • SP-70 LNA
  • Airspy R2
  • HDSDR on Windows to WSJTx software14 Jul: Successful JT4G detection with algorithm by EA4GPZ
  • 15 Jul: Successful JT4G decoding with Airspy R2 and WSJTx on windows

JE1CVL

  • Successful JT4G decoding on 15 Jul

DK5LA

  • 256 El. X-pole gain 23.2 dBd
  • LDMOS PA Beko HLV 4000
  • 15 Jul: First test of GMSK-JT4G repeater
  • Downlink received by HB9OAB, W2RTV, IW1DTU, IU2EFA, PY4ZBZ, PA0DLO, and I0LYL

VK5EI

  • Successful JT4G decoding from 29 Jul

KO4MA‏

  • M2 42 element RHCP
  • SP-7000 preamp
  • 100ft LMR-400
  • IC-9100 transceiver
  • WSJT-X 1.9.1Successful JT4G decoding from 29 Jul

3B8DU

  • Antenna: hy-gain UB-7030SAT (14.0 dBc)
  • Preamplifier: SSB DBA-270
  • Feeder: 30m of Heliax 1/2 in. FSJ4-50B + 5m RG-213
  • Transceiver: TS-2000
  • Successful JT4G decoding from 30 Jul

20 thoughts on “DSLWP Radio Info”

  1. Pingback： Trying to make the DSLWP-B GMSK decoder more robust – Daniel Estévez
  2. Pingback： Decoding a Moon Orbiting Satellite 378500 km’s away with an RTL-SDR
  3. Pingback： Lunar satellite sends pictures to radio hams | Coastal Ham Radio
  4. Pingback： DSLWP-B talk in IberRadio – Daniel Estévez
  6. Pingback： Report of the DSLWP-B Amateur observations of the Moon and Earth – Daniel Estévez
  7. Pingback： De maan én de Aarde, gefotografeerd door amateurs, naar de aarde gehaald met de Dwingeloo radiotelescoop
  8. Pingback： Hams see Dark Side Of The Moon Without Pink Floyd « Technology « MasMaz
  9. Pingback： Hams see Dark Side Of The Moon Without Pink Floyd - itmix.cz | Informační Náskok
  10. Pingback： Hams see Darkish Aspect Of The Moon With out Pink Floyd – Encrypted Elite
  11. Pingback： Hams see Dark Side Of The Moon Without Pink Floyd – PI4ZLB
  12. Pingback： Download of DSLWP-B Moon and Earth pictures continues – Daniel Estévez
  13. Pingback： Geometry for DSLWP-B Moonbounce – Daniel Estévez
  14. Pingback： DSLWP-B camera planning for the beginning of November – Daniel Estévez
  15. Pingback： Batch processing of DSLWP-B Moonbounce: part I – Daniel Estévez
  16. Pingback： December DSLWP-B camera planning – Daniel Estévez
  17. Pingback： Diffraction in DSLWP-B lunar occultations – Daniel Estévez
  18. Pingback： Cantilever Racking
  19. Pingback： Un satellite chinois capture la lune et la terre comme vous ne les avez jamais vues - Liberté News
  20. Pingback： DSLWP-B last activities and end of mission – Daniel Estévez

发表评论

电子邮件地址不会被公开。 必填项已用*标注

This site uses Akismet to reduce spam. Learn how your comment data is processed.