Dclock ham win101/26/2024 One must be very careful to ensure that RF power is not applied before the sequencer can complete its transition to the Transmit state or damage to the Preamplifiers and/or relays at the tower will occur. This delay coupled with the Transmit delays built into the MAP65 and WSJT10 software ensures that we will not hot switch the MAP65 Preamp System on our tower. The circuit enabled our S2 Sequencer to control the relay along with the rest of the sequencing required when changing our EME Station from Receive to Transmit and back.įinally, we configured a 30mS transmit delay in our IC-9700 to ensure that the S2 Sequencer had some time to do its job as the station changed from Receive to Transmit. We also built a simple driver circuit for the relay using a Darlington Power Transistor and some protection diodes. To enable both the receivers in our IC-9700 and the FUNcube Dongle to function simultaneously, we built a circuit using a CX800N DPDT RF Relay and a Mini-Circuits 2-Way RF Splitter. We’ll explain each of these components as well as the supporting shack infrastructure that we are using for EME below. Transmit/Receive Relay System to enable dual-receivers/decoders (not visible above).FUNCube Pro+ SDR Dongle (not visible above).Green Heron Engineering RT-21 Az/El Rotator Controller.Icom IC-9700 Transceiver with a Leo Bodnar GPDSO and Reference Injection Board.The components in our 2m EME station include (left to right): We built some shelves to make room for all of the equipment as well as to create some space to move our Satellite Ground Station 4.0 to this same area. The image above shows the equipment that is dedicated to EME and Satellite operations in our station. Our plan is to do a mix of JT65 Digital and CW operation with our 2m EME Station. Now that our 2m EME Antenna Array is fully installed, we have turned our attention to the setup of the equipment in our Shack. Tagged Antennas and Feedlines, Digital, EME, SDR, Shack Design and Construction, Software, Station Design, Station Performance, Tower Construction and Maintenance, VHF-UHF, Yagi EME Station 2.0 Part 11 – Station Hardware In ShackĮME and Satellite Ground Station Hardware Components Posted in Antennas and Feedlines, Digital, EME, Shack Design and Construction, Software, Software Defined Radio, Space, Station Design, Station Performance, QSOs and QSL'ing, Tower Construction and Maintenance, VHF-UHF. You can read about the installation of Fiber Optic Networking to reduce RFI and improve our EME station’s performance here. you can read more about that project here.Ī key part of optimizing our EME Station was to reduce RFI from the network in our home. We are in the process of upgrading our EME station to include adaptive polarity. The first Tech Night in the EME Series was about Getting Started in EME Communications. There is a demonstration of an actual live EME contact on the 2m band at 57:57 in the video. You can learn more about the Nashua Area Radio Society’s Tech Night program here. Here’s a link to the presentation that goes with the video. You can view the Tech Night presentation by clicking on the video above. January 2021 Tech Night – EME II: Station Construction and Operation Tagged 6m Magic Band, Amateur Radio On The Internet, Digital, EME, Satellites, VHF-UHF Tech Night – EME II: Station Construction and Operation Posted in Amateur Radio On The Internet, Digital, Satellites, Software, VHF-UHF. VHF+ modes such as Meteor Scatter, Tropo, EME, and Satellite paths are also covered. Topics include the many online tools to help one determine and measure propagation conditions. I wanted to share the presentation and video from this Tech Night so that our readers might learn a little more about propagation and how to use it to facilitate contacts.Īnita, AB1QB provides a comprehensive overview of HF and VHF/UHF propagation and how to use it to Work the World. February 2021 Tech Night – Understanding and Using Radio Propagation to Work The WorldĪnita, AB1QB, recently did a Tech Night Program on Radio Propagation as part of the Nashua Area Radio Society’s Tech Night program.
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