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EME with digital modes 144 MHz • SM4GGC Stig Larsson
• Ham radio licensed since 1973
• Active on VHF/UHF 1973-1983 and from 2012-
• EME 1979-1983 and from 2012-
Agenda
• Modes for digital EME • WSJT 10 “Weak Signal Joe Taylor” (K1JT) • WSJT-X “Weak Signal Joe Taylor” (K1JT) • MSHV (LZ2HV) • MAP65 Broad band receiving software (K1JT) • EME setup • Antennas for EME • EME tools • Result and possibilities
JT65
● Modulation mode created by Joe Taylor – K1JT in 2003
● DSP techniques optimized for extremely weak but slowly varying
signals (moon bounce) and narrow bandwidth
● Uses 65-frequency shift keying with a sync tone and low data rates (2,69
baud)
● Can use ”Deep Search table” = Call3 file (list of stations known to do EME)
for error correction
● Decode signals many decibels below the noise floor about -24 dB without
Deep Search and with Deep Search about -28 dB
JT65 QSO
● Fixed and Expected Message, Grid and Callsign Formats
● CQ SM4GGC JO69
● SM4GGC KD7UO CN87
● KD7UO SM4GGC OOO
● RO “Short hand message” for RO, RRR and 73 (two tones)
● RRR
● 73
JT65B message bandwidth 355 Hz
Sync tone Message information
RO 73 Short hand message
QRA64
● Modulation mode created by IV3NVV Nico Palermo 2016
● Q-ary(63,12) repeat-accumulate code. Operationally similar to JT65 but there are no sync tone and no two-tone short hand message.
● NO ”Deep Search table” = Call3 file (list of stations known to do EME) for error correction. Only using a priori information
● Better than JT65. Decodes full 72-bit message about -28 dB and Locator or report at -30 dB
QRA64 QSO
● Fixed and Expected Message, Grid and Callsign Formats
● CQ SM4GGC JO69
● SM4GGC W2HRO FN20
● W2HRO SM4GGC -23
● SM4GGC W2HRO R-27
● W2HRO SM4GGC RRR
● HNY 73 GL
QRA64 message bandwidth 111 Hz Red curve indicates that the decoder has achieved synchronization and the beginning of a message
Message information
WSJT 10
JT65A EME 6M BW = 178 Hz JT65B EME 2M BW = 355 Hz JT65C EME 70/23cm BW = 711Hz JT65B2 EME 2M contest mode 30 sek JT65C2 EME 70/23 contest mode 30 sek
Call3 file with know EME hams (Deep Search) FSK441 Meteor Scatter on 2M ISCAT-A/B Meteor/Inon Scatter on 6 M JT4A - G EME/tropo microwave JTMS new mode for Meteor Scatter (MSK) Medium Shift Keying
DT= The signal’s time offset in seconds relative to your computer clock. (For a EME- trace around 2,5 sec) Average decode of several trace
Sync tone detected Confidence level 0-10 on Deep Search
Get started with WSJT 10 Interface from Radio to PC • Mic, AF-out and Comport PC to TX Key Sync your computer clock • Automatically sync computer time with Dimension 4 http://www.thinkman.com/dimension4/ Settings on the tranciver • USB mode on • Broadest Filter Width (5KHz) • Noise blanker can be active • AGC off • Modulate TX until you se a some ALC level on transceiver ( Ok for slow modes in EME like JT65 and QRA64)
Movie time JT65B QSO in WSJT 10 http://sm4ggc.se/WSJT10_EB5EEO.mp4
WSJT-X 1.7
New Decoder for JT65 Frankie- Taylor New mode for EME QRA64 Automatic EME Doppler tracking useful on higher fq Enhanced Echo mode
Improvement for EME compared to WSJT 10
WSJT-X Echo mode
Movie time QRA64A QSO in WSJT-X http://sm4ggc.se/QRA64_S52LM.mp4
MSHV By LZ2HV
Uses the free codec's software from K1JT No support for Deep search Only JT65 for EME so far Fast development New version is coming every month
MAP65 Broad band receiver software for EME K1JT
Can be use with a SDR-radio single channel or dual channel with common local oscillator for Adaptive Polarization
Installing MAP65 and the FUNcube Pro+ http://kb5wia.blogspot.se/
Low cost alternative for single channel solution FunCube Dongle Pro+ or other SDR-Dongle
Movie time JT65B QSO in MAP65 http://sm4ggc.se/MAP65_RX8XR.mp4
SM4GGC EME setup
1 st MAP65 V or H pol
WSJT-X or WSJT 10 V or H Pol
2 nd MAP 65 RX V or H Pol
Possible to shift RX-pol independent of TX-pol Switching TX-pol
SM4GGC EME setup
Antennas 4x14 el DK7ZB X-yagi H and V pol Antenna rotator AlfaSpid RAS Antenna tracking PST Rotator TS-2000 for RX WSJT and TX 2 x Fun Cube Dongle pro+ for RX MAP65 1 PC with MAP65 and WSJT and supporting program 1 PC with MAP65 only
2 X FunCube Dongle Pro+ for MAP65 setup
SM4GGC EME setup with supporting program
Antennas for EME 144 MHz
• 1 Yagi possible to QSO 4 Yagi station
• 2 Yagi possible to QSO other 2 Yagi station
• Good solution 4 yagi • Big advantage to use X-yagi
• Optimal is to use Adaptive polarization in RX
JF4TGO with M2 2 X 2MXP20
DL4KUG 4x9 el LFA Yagi
OK1IL 4x9el DK7ZB
KB5WIA 2x7el V-pol
DD0VF 2X9 el Rotatable polarity
OX3LX Greenland
SM4GGC 4x14 el DK7ZB X-yagi H and V pol
EME tools
N0UK chat for EME http://www.chris.org/cgi-bin/jt65emeA N0UK Chat client from PE1L
Result and possibilities
• EME since 2012- over 1 600 QSO
• Different call signs total 678
• Stations QRV on 144 MHz EME could be more than 1000
• So what are you waiting for?
SM4GGC Thanks for me
