[Discuss-gnuradio] Re: FSK with RFX2400

[Patrick Strasser]

Hello Kaleem!

kaleem ahmad wrote am 2008-07-23 15:58:

> If you have two USRP boards and two RFX2400 daughter cards then you can try
> these codes (fsk_tx.py and fsk_rx.py) using:

Which version of GNU Radio are you using?
Which cable/antenna setup do you use?

You are hard coding your frequency. You could extend the options to set 
the frequency with a parameter to get more flexibility.

Moreover with two USRP you are probably not exactly at the same 
frequency. Read 
<address@hidden> [1]:
--------8<----------
The 64MHz oscillator on the board has a maximum 50PPM error.  This
gives an error of up to 3200Hz.
--------8<----------

You can watch the sender (and find the apparent receiver frequency) with 
usrp_fft.py (from gr-utils) .

You could try it first with a lower frequency. Start with a Basic{RX,TX} 
if you have, this results in less error. If you really need to use 
2.6GHz, you will have to find and lock your signal before you will be 
able to get good transmissions.

Patrick

[1] http://permalink.gmane.org/gmane.comp.gnu.radio.general/11044
--
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at student dot tugraz dot at>
Student of Telematik, Techn. University Graz, Austria