Re: Bluetooth using RFX-2400

GNU Radio
1

Hi Dominic,

RFX2400 works in the range of 2.3GHz - 2.9GHz (both TX/RX)

and you may check out http://gnuradio.utah.edu/trac/wiki/UsrpRfxDiagrams
for
connection diagrams. There is a bandpass filter on board which restrict
you
to ISM band (2.4 - 2.4835 GHz) , but it can be bypassed if you need.
Here
you may filter 83.5 MHz spectrum without bypassing the BPF.

Well, can you send me the codes which you have written.

Regards,
Tarun
University of Texas at Dallas

Dominic S. wrote on Wed, 16 May 2007 17:21:06 +0100:

  1. What is the bandwidth of the RFX-2400 daughterboard, i.e. how many
    Bluetooth channels (1MHz intervals) can I receive at any one time with one
    daughterboard?

  2. Or conversely, if I want to watch the hopping pattern using FFTs to get the
    order of the frequencies that it hops to, how many daughterboard will I need
    to use to view the full spectrum (80MHz)?

2

I think I may’ve mis-phrased the question, if I have a single
daughterboard
and I tune to 2.44GHz, what are the highest and lowest frequencies that
I
should be able to see when I run something like the usrp_fft waterfall
program?

–Dominic

3

Dominic S. wrote:

I think I may’ve mis-phrased the question, if I have a single daughterboard
and I tune to 2.44GHz, what are the highest and lowest frequencies that I
should be able to see when I run something like the usrp_fft waterfall
program?

With a decimation of 8, you will see 64 Msps/decimation = 8 Msps complex
over USB = 8 MHz passband = 2436 MHz - 2444 MHz.

–
Johnathan C.
Corgan Enterprises LLC
http://corganenterprises.com

4

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Johnathan C. wrote:

Dominic S. wrote:

I think I may’ve mis-phrased the question, if I have a single daughterboard
and I tune to 2.44GHz, what are the highest and lowest frequencies that I
should be able to see when I run something like the usrp_fft waterfall
program?

With a decimation of 8, you will see 64 Msps/decimation = 8 Msps complex
over USB = 8 MHz passband = 2436 MHz - 2444 MHz.

Has anyone actually implemented using smaller I/Q coefficients and doing
e.g. 16 MHz with 8-bit coeffs or 32 MHz with 4 bits? I’m curious as to
how performance degrades with lower resolution.

32 MHz should be the maximum passband since the A/Ds are at 64 MHz, yes?

  • -Dan
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