Sync both TXs in LimeSDR USB

Projects LimeSDR
1

Hi,

Im using limeSDR USB with soapySDR and limesuiteNG.

Im trying to change the phase between my two Tx channels.

fs = 5e6
freq = 80e6
tx_gain = 55
tx_chans = [0, 1]
sdr = SoapySDR.Device()

for ch in tx_chans:

    sdr.setSampleRate(SOAPY_SDR_TX, ch, fs)
    sdr.setFrequency(SOAPY_SDR_TX, ch, freq)
    sdr.setGain(SOAPY_SDR_TX, ch, tx_gain)

tx_stream = sdr.setupStream( SOAPY_SDR_TX, SOAPY_SDR_CF32, tx_chans)

Only by doing this, and using the oscilloscope, the phase between the two Txs is not deterministic.

The phase is always changing… It’s -90 or 90 deg.

Do you know how I can sync both Tx channels?

Thanks!