Receive sensitivity of B200

Hi, I use B200 with OpenBTS at 900MHz. I get very low range (about 10m
only) and I identified that this is due to receive channel in B200.
Changing rxgain between 0 and 70dB makes vey little difference. Does
anyone know how the receive sensitivity of B200 compare with, for
example, WBX?
What could be the reason for this low sensitivity? uhd_fft spectrum
looks “normal” , in the sense that I do not suspect a broken LNA.

On 05/18/2014 05:49 PM, Robert L. wrote:

Hi, I use B200 with OpenBTS at 900MHz. I get very low range (about 10m only) and
I identified that this is due to receive channel in B200. Changing rxgain between
0 and 70dB makes vey little difference. Does anyone know how the receive
sensitivity of B200 compare with, for example, WBX?
What could be the reason for this low sensitivity? uhd_fft spectrum looks
“normal” , in the sense that I do not suspect a broken LNA.


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Are you on the correct antenna port?

The B2xx RF section is roughly the same noise figure and total gain as a
WBX.


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

Are you rx’ing only with the B200, or tx’ing too?

If you have a VHF antenna, you can tune it to your local FM radio
stations
and you will see them on uhd_fft if things are set up correctly. Adding
to
what Marcus said, check the correct LED is lit to verify you’re using
the
right antenna port.

M

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