[USRP-users] Output power of E310

Claudio Cicconetti ccicconetti at mbigroup.it
Mon Mar 14 03:45:46 EDT 2016


Dear Trip,
I am using the default sub-device, which should be A:A, and I am setting
the center freq with --freq.

The exact command I am issuing (with various gain/freq) is:

/usr/lib/uhd/examples/tx_waveforms --ampl 0.7 --gain 89.8 --freq
1.5925e9 --rate 500e3

Best regards,
Claudio

On 03/11/2016 04:57 PM, James Humphries wrote:
> Hi Claudio,
> 
> Which antenna port are you using? And you are setting the center freq with
> the --freq option?
> 
> -Trip
> 
> On Fri, Mar 11, 2016 at 6:08 AM, Claudio Cicconetti via USRP-users <
> usrp-users at lists.ettus.com> wrote:
> 
>> Dear all,
>> We are working on a testbed for satellite communication where the
>> transmitter is an Ettus E310. Since we are dealing with the link budget,
>> we need to understand the maximum power that we can achieve.
>>
>> We have run a few experiments to gather a rough order of magnitude using
>> the tx_waveforms example (with --ampl 0.7 and --gain 89.8) and measuring
>> the output power with a spectrum analyzer.
>>
>> We have found the following results:
>>
>> 70  MHz -> -6 dBm
>> 1.5 GHz -> -17 dBm
>> 3   GHz -> 10 dBm <<< as per datasheet
>> 6   GHz -> 4 dBm
>>
>> The sample rate does not seem to play a role in the experiments.
>>
>> Do these results make sense to you? For instance, we would have expected
>> to have a monotone relationship between frequency and power...
>>
>> More important: since our application is expected to work at 1.5 GHz
>> (which accidentally achieves minimum output in our experiments) is there
>> any way to increase the output power in that frequency range?
>>
>> Best regards,
>> Claudio
>>
>> --
>> Claudio Cicconetti, PhD
>> Software Engineer - MBI S.r.l. - Pisa, Italy
>>
>>
>> _______________________________________________
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
> 





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