Kletskous LINEAR TRANSPONDER

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Presentation transcript:

Kletskous LINEAR TRANSPONDER Leon Lessing ZS6LMG An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League WHAT IS A TRANPONDER? Linear, digital and FM only Kletskous is linear UHF in USB VHF out USB Bandwidth Range 435,135–435,165 MHz uplink 144,850-145,880 MHz downlink 435,150 +/-7,5kHz An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League RF PROPAGATION CONDITIONS UHF uplink 152dB loss to the horizon (2400km) 140dB at 600km (right above) 12dB improvement (6dB for doubling/halving the distance) For 5W (37dBm) + 10dBi (8dBd) gain antenna will give about -105dBm at satellite (0dBi antenna). This improves to –93dBm right above An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League RF PROPAGATION CONDITIONS VHF downlink Everything improves with 6dB, 146dB loss to the horizon (2400km) For 23dBm TX at satellite (0dBi antenna) we will get -115dBm at ground after 8dBi (6dBd) RX antenna This improves to -103dBm right above Linear amplifiers are expensive v An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League Design Notes - Schematic diagram walk through SAW filters for UHF Preamps amplifier +/- 30db Mixer MAX2680 (390,100 MHz) Crystal filters IF amplifier with AGC Upmixer SA612 (100,825MHz) BGA416 amps, BFR93A pre driver Final driver MAAM-010617 An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League SAW filters for UHF Preamps amplifier +/- 30db Mixer MAX2680 (390,100 MHz) Crystal filters IF amplifier with AGC Upmixer SA612 (100,825MHz) BGA416 amps, BFR93A pre driver Final driver MAAM-010617 An IARU Region 1 Event Hosted by the South African Radio League

An IARU Region 1 Event Hosted by the South African Radio League DEMONSTRATIONS An IARU Region 1 Event Hosted by the South African Radio League