Basic TX and RX freq issue

GNU Radio
1

Hi,
I am working on using gnuradio to test the performance of my
powerline
communication setup from 0-200MHz. So I am using Basic TX and Basic RX
for
my tests as they both are in range from 0-250MHz. I understand that
basic
RX has receive frequency from -32Mhz to +32 Mhz and the frequencies
above
that are aliased and found within this range. Now when i ran
benchmark_tx.py I see that if i transmit at tx freq 120Mhz and use
benchmark_rx.py at frequency 120MHz, I am not getting any output and
it’s
timing out. So i changed the tx-freq to -8Mhz knowing that 120Mhz is
aliased to -8Mhz. I kept the rx freq at 120Mhz. When i do this, I see an
immediate succesfull reception of packets. I can also see my fft being
centred at 120Mhz after running uhd_fft. So my question is

  1. Can i use this result and say that my setup is working fine at
    120Mhz?
    It is an image frequency formed by aliasing.

  2. I used the same transmitter setting with tx-freq at -8Mhz and changed
    the recieve frequency to 56Mhz(64-8) which is another alias at -8Mhz. I
    again saw a clear reception of packets and an fft centred at 56Mhz Does
    that in anyway mean that there is simultaneous transmission at all the
    particular aliased frequencies like 56Mhz,188Mhz etc.

–
Regar
ds,

Karan T.