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

2. 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, ,880 MHz downlink
435,150 +/-7,5kHz
An IARU Region 1 Event Hosted by the South African Radio League

3. 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

4. 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

5. 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
An IARU Region 1 Event Hosted by the South African Radio League

6. 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
An IARU Region 1 Event Hosted by the South African Radio League

7. 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