[USRP-users] b210 tx power

Marcus D. Leech mleech at ripnet.com
Thu Oct 30 14:52:00 EDT 2014


On 10/30/2014 02:09 PM, Ralph A. Schmid, dk5ras wrote:
>
> Here we go:
>
> When using OpenBTS, Rangenetworks SDR1 GSM 1800 18 dBm, Ettus B210 GSM 
> 1800 0dBm, GSM 900 6 dBm.
>
> With gnuradio and full gain, Ettus B210 plain carrier, 935 MHz 15 dBm, 
> 1877 MHz 9 dBm.
>
> Ralph.
>
What was the carrier magnitude you used?

What was the actual gain setting on TX?



> *From:*mleech at ripnet.com [mailto:mleech at ripnet.com]
> *Sent:* Thursday, October 30, 2014 15:52
> *To:* Ralph A. Schmid, dk5ras
> *Subject:* RE: [USRP-users] b210 tx power
>
> The spec sheet for B2xx simply says >10dBm (at max power setting).  In 
> general, the B2xx series produces less maximum power than other 
> products that use daughter-cards.
>
> See performance data for WBX/SBX/CBX here:
>
> http://files.ettus.com/performance_data/
>
> Also, keep in mind that the gain-control range on the B2xx series is 
> larger than on other products, so if you're comparing at the same gain 
> settings as you would on other products, you'll get misleading results.
>
> On 2014-10-30 09:40, Ralph A. Schmid, dk5ras wrote:
>
>         You can't reliably use "communication range experiments" to
>         measure power.
>
>     Sure, but the peak on my analyzer also looked much smaller at 1800 MHz.
>
>         Also, don't forget, that the path-loss laws scale with
>         wavelength. You can easily see this with on-line path-loss
>         caclulators.
>
>     Still the SDR1 had much higher output power, although both claim to have
>
>     similar power.
>
>       
>
>     But I will measure it and post the results...
>
>       
>
>     Ralph.
>
>       
>
>       
>
>       
>


-- 
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org

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