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 On Sun, May 18, 2014 at 11:56 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 05/18/2014 05:49 PM, Robert Light 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. >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> Are you on the correct antenna port? > > The B2xx RF section is roughly the same noise figure and total gain as a > WBX. > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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