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From: | Josh Blum |
Subject: | Re: [Discuss-gnuradio] How to generate a FM signal? |
Date: | Mon, 26 Oct 2009 18:28:30 -0700 |
User-agent: | Thunderbird 2.0.0.23 (X11/20090817) |
nansai hu wrote:
I appracite you could tell me what is the meaning of following paramaters: @param audio_rate: sample rate of audio stream, >= 16k @type audio_rate: integer @param quad_rate: sample rate of output stream @type quad_rate: integer
This is the input and output rates of the block.
@param tau: preemphasis time constant (default 75e-6) @type tau: float @param max_dev: maximum deviation in Hz (default 75e3) @type max_dev: float
No idea, check the source, but the default values are good to get a working wbfm radio.
I try to change the max_dev from 10 to 1000,and give it to a usrp source as baseband signal,
For transmit, the usrp expects numbers between +/- 2**15. Your transmit amplitude should be on the order of 10k. What are you sending it?
-Josh
but, the bandwith on spectrum analyize don not change.How to change deviation of a fm signal? 2009/10/26 nansai hu <address@hidden>I tried to run your code wfm, but there is nothing happened in my spectrum analyzer. I am just wondering that your code is in baseband or how to add a carrier freq by usrp source. 2009/10/24 Josh Blum <address@hidden>nansai hu wrote:Is anybody had a experiment about How to generate a FM signal? Use the wideband and/or narrowband fm blocks; just specify your datarates. http://gnuradio.org/cgit/gnuradio.git/tree/gnuradio-core/src/python/gnuradio/blks2impl or tell me how to use FM MOD or VCO module in GRC, what is the paramatersensitive means?check the source :-) -Josh
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