[Discuss-gnuradio] Maximum I/Q signals frequency limit for TX

[Shaiful]

Hi guys,

I'm trying to generate complex I/Q waveforms using
this command (for 700 KHz):

./usrp_siggen.py -T A -w 700000 -f 0

>From the mailing list, I've read that the USRP can
transmit up to 44 MHz.  

Unfortunately I can only transmit clean quadrature I/Q
signal only up to 700 kHz.  Above the frequency, I'm
starting to see two or more waveforms for each
generated quadrature I/Q signals.

If I increase the frequency further to 1 MHz, USRP
only generate one signal from TX_A connector, there is
no signal from TX_B connector.   Both TX_A and TX_B
connectors are on daughter board of 'USRP Tx side A'
as indicated by '-T' flag. FYI, I'm using LFTX
daughter board not the Basic ones.

If I transmit more than 1 MHz, the frequency is still
cap at 1 MHz.

Any idea what is happening and how to get higher
frequency?

Thanks,

Regards,
Shaiful

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