Trouble transmitting with benchmark_tx.py and Basic TX

I am having trouble transmitting data using benchmark_tx.py at carrier
frequencies higher than approx. 40Mhz using the Basic TX daughterboard?
I
didn’t have any problem transmitting an analog audio signal over carrier
frequency within board frequency range as well as any waveform using
usrp_siggen.py at carrier frequencies around 100MHz. However, using
benchmark_tx.py I can’t do that. It works fine at carrier frequency
40MHz
with Basic TX and Basic RX. What TX board or method should I use to
transmit
in the range 80MHz-120MHz? Any help would be highly appreciated.

Thank you

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