AnsweredAssumed Answered

Tx received on Rx without connection

Question asked by atikah.h on May 4, 2017
Latest reply on May 26, 2017 by sripad

When the ADI IIO oscilloscope transmits a tone, it can only be received when the TX and RX ports are connected. 

 

However, when I used my program just to generate a tone, the ADI IIO oscilloscope picks up the signal even when the ports are not connected.

 

The parameters used are below, and coded using the libiio: Main Page  library.

 

iio_device_find_channel:

voltage0 = output (true)

altvoltage1 = output (true)

 

Port A selected, TX_LO frequency = 2.4GHz

 

voltage0:

bandwidth = 20MHz

hardware gain = -5

sampling frequency = 60MHz

 

TX1_I_F1 :

raw = true

phase = 0

freq = 5MHz

scale = 0.3

 

TX1_Q_F1 :

raw = true

phase = 270 (upper side band)

freq = 5MHz

scale = 0.3

 

Results:

RX port connected:

 

Receive port connected

 

RX port disconnected, signal still seen

Receive port disconnected

 

Does anyone know why this happens?

 

Thanks

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