Fm_tx4.py stronger signal, amplifying before sending

GNU Radio
1

Hi there,

i did make some progess again but had to amplify collected audio
samples using modified usrp_rx_noguiy into a file. That was working
great before successfully resending it i had to normalize and amplify
the signal and
then resend it using fm_tx4.py. So my question is the following:

Can i amplify the signal before sending? How do i do that the easiest
way in python? Setting the amplitude value higher in the sourcecode?

Greetings

Max

2

Max Moser schrieb:

Can i amplify the signal before sending? How do i do that the easiest
way in python? Setting the amplitude value higher in the sourcecode?

Of course. Use one of the gr.mulitply_const_xx blocks, x in (c, f, i,
s). You can change the multiplication factor at runtime. Have a look at
http://gnuradio.org/doc/doxygen/classgr__multiply__const__cc.html

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

3

Patrick S. schrieb:

Max Moser schrieb:

Can i amplify the signal before sending? How do i do that the easiest
way in python? Setting the amplitude value higher in the sourcecode?

Sorry, did not read carefully.
You don’t need to add anything, the block “gain” is where you want to
turn at the knobs.

Besides, do you have a working antenna for 27MHz?

Patrick

–
Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria