8 144 MHz EME Logistics Path loss: Perigee 356,400 km = 251.5 dB Apogee 406,700 km = dBThe Moon is 1 degree wideThe Moon has about 7% ReflectabilityThere is Spatial Polarity between two StationsFaraday Rotation
9 EME made easyWhat has made EME possible today with relatively modest antennas and power?
10 WSJT WSJT Software was developed by Joe Taylor, K1JT Meteor Scatter, Ionospheric and EMEWhat does WSJT do for you?6 dB improvement over what the ear can hear
11 What do we need to work EME using WSJT? A minimum of 15 dB of REAL antenna gainA mast mounted preamp200 watts of TX PowerIt can and is done with less but you may be depending on the station at the other end to make up any gain difference.
12 What Band to Choose? The best choice to start is 2 Meters Why? It is far the most active band. As a consequence it is easy to find a schedule partner.Technology more manageable than higher frequency bands.
13 The Antenna It all starts with the Antenna Use the VE7BQH 144 Mhz Chart to choose or evaluateEspecially watch for VSWR Bandwidth, Front/Rear and the overall G/TWhat is G/T? G/T is a overall figure of merit. In simple words, the forward gain divided by the sum of all the side and rear lobes.
14 Choosing an Antenna OF YAGI ANTENNAS ON 2 METERS 144.1 MHz G/T SIMULATIONS OF A 4 BAY ARRAYOF YAGI ANTENNAS ON 2 METERS144.1 MHzTYPE OF L GAIN E H Ga Tlos Ta F/R Z VSWR G/TANTENNA (WL) (dBd) (M) (M) (dBd) (K) (K) (dB) (ohms) Bandwidth+G0kSC 6LFA :+G0KSC 7LFA :G4CQM :DK7ZB :G0KSC 8LFA :K1FO :YU7EF :G4CQM :BQH8B :+G0KSC 8OWL :I0JXX :DK7ZB :+G0KSC 9OWA :+RA3AQ 9S :M² 9SSB :G0KSC 9LFA :
15 Choosing an Antenna TYPE OF L GAIN E H Ga Tlos Ta F/R Z VSWR G/T ANTENNA (WL) (dBd) (M) (M) (dBd) (K) (K) (dB) (ohms) BandwidthDK7ZB :+YU7EF 10LT :K5GW :+G0KSC 10LFA :G4CQM :K1FO :YU7EF :+G0KSC 10OWL :I0JXX :BQH 12J :M :WB9UWA :DK7ZB :+YU7EF 11B :K1FO :G0KSC 11LFA :*M2 20 XPOL :
16 Choosing a PreampThe very best Noise Figure of any of the Japanese VHF capableTranceivers like the ICOM IC-746, Yaseu FT-747 or Kenwood TS 2000 is 4 dBYou need to strive for a composite Noise Figure of under 1 dB.Therefore, the preamp should have a Noise Figure of about 0.5 dB
17 Commercial Preamps Advance RadioResearch (ARR) Down East Microwave SSB ElectronicsStand alone preamps or preamps with switching are available.An alternate choice is building your own.
18 The Transceiver ICOM IC-746 Yaseu FT-847 Kenwood TS 2000 TX Power 150 – 200 watts