Results of first Delfi-n3Xt transponder test

Delfi-n3Xt Satellite

Delfi-n3Xt Satellite

Delfi Nanosatellite Program Manager, Jasper Bouwmeester PC4JB, has announced results of the first test of the Delfi-n3Xt CubeSat 435/145 MHz linear transponder that were carried out on February 20.

Dear all,

Today we did a first transponder test. We could hear the beacon, but unfortunately did not hear anything back from our calls. Also we were missing the noise floor of the transponder band. Our hypothesis is that our adjustable LO (Si570) which is mixed with the IF band could not be programmed correctly and hence the pass-band goes outside our filtered band (which is a good thing, because we do not want to transmit on illegal frequencies). This LO is adjustable by I2C communication and should be programmed each time at power up (so each time the transponder mode is activated. We will do two attempts more on Friday, February 20 at the morning ground passes and even if that doesn’t help we will keep on trying with different settings. If the situation changes I will update you again.

Best regards,

Jasper, PC4JB

IARU coordinated Delfi-n3Xt frequencies
• 145.870 MHz Telemetry
• 145.930 MHz Telemetry
• 2405.00 MHz High speed data
• Inverting SSB/CW transponder
– 435.530-435.570 MHz uplink LSB
– 145.880-145.920 MHz downlink USB

Telemetry reception


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