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 Talasila
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