Trouble transmitting with and Basic TX

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

Thank you

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