Re: [Discuss-gnuradio] RFX2400 using 2.4-2.48GHz Patch antennas

[Dan Halperin]

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In my experience the USRP stops performing very well at low bitrates.
This is due to the current code's inability to handle large frequency
offsets when the symbol period is that long.

Try it at 250kbps/500kbps.

- -Dan

Joseph Crowley wrote:
> Joseph Crowley wrote:
> 
> Hey,
> Just purchased a couple of RFX2400 transceiver dboards as well as a couple of 
> patch antennas (WA5JVB) and tried running the benchmark program from one USRP 
> to another (both mounted with the RFX boards). However it didn't seem to 
> work. I tried looking for a spike using the fft on the receiver USRP but 
> found only a spike at 2.4GHz (from surrounding wireless hardware) which didnt 
> change during transmission (using benchmark_tx.py). Was just wondering what 
> the problem is if anyone else has encountered it. i.e. is it a problem with 
> the boards? Or antenna? Or is it a problem with the benchmark script?
> 
>     Thanks
>     -Joseph Crowley
> 
> 
> You'll have to provide more information than that. Which benchmark script and 
> what were the parameters? What was the setup of the experiment (TX-RX 
> distance)? Have you successfully run other GNU Radio applications? Try 
> usrp_siggen and usrp_fft.
> 
> Tom
> 
> The commands being used are:
> 
> ./benchmark_tx.py -f 2.4G -T A --tx-amplitude=10000 -s 1000 -r 1 -v -M 5
> 
> ./benchmark_rx.py -f 2.4G -R A -r 1 -v
> 
> used rate of 1 just to set to lowest possible bitrate (for gmsk 35 kb/s)
> 
> Distance have ranged between 1 - 2 metres.
> 
> When using usrp_fft.py on the receiver the transmitter Rf power is showing on 
> the display (pretty large >10db gain from the noise floor).
> 
> Problem now is the receiver is not receiving any packets.
> 
> Thanks 
> Joseph Crowley
> 
> 
> 
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