[USRP-users] max input power B200

Marcus Müller marcus.mueller at ettus.com
Mon Oct 2 04:05:45 EDT 2017


Marcus is right, but: Also, what is to be clarified? 20 dBm (or 10 dBm)
is way more than 0dBm, true, but when would you ever expect a receive
antenna to generate 1V, if you're not standing right next to a massive
broadcast transmitter, or radar transmitter, or put your WiFi antenna in
a microwave oven?

Aside from that, 1 kHz is way below the lowest frequency the B2xx can
receive (not that frequency matters at all for the power aspects in
general, but that 1kHz wouldn't even pass through the coupling
capacitors without significant attenuation. 1kHz is, for all practical
issues of RF communications, DC). Also note that 0dBm is not the maximum
sensibly receivable signal; your receiver will be clipping at this point
very much! Sensible receive powers are more in the range of -20dBm or less.

Best regards,

Marcus


On 02.10.2017 08:16, Marcus D. Leech via USRP-users wrote:
> On 10/02/2017 12:10 AM, Nirmala Soundararajan via USRP-users wrote:
>> Hi,
>>
>> B200 mini data sheet mentions maximum input power as 0 dBm. A 1V, 1
>> kHz signal will give 0.5W power which is above 20 dBm and way above 0
>> dBm!  Can this please be clarified?
>>
>> regards
>>
>> Nirmala
>>
>>
> You should perhaps study this table:
>
> http://wera.cen.uni-hamburg.de/DBM.shtml
>
>
>
>
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