Could you please share the details of your noise figure test method? Thanks,
Mike On Thu, Jan 22, 2015 at 09:37:10AM +0100, JMG wrote: > > Sensitivity measurements > > Test results for the noise figure NF of the HackRF, obtained at a > frequency of 435MHz: > > NF = 22dB LNA=OFF > NF = 10.8dB LNA=ON > NF = 1.1dB LNA=ON, additional external LNA "LNA4ALL" > > RTL-SDR, tuner 820T or 820T2 > NF = 3.7dB > > The HackRF really is extremely "deaf" when the internal preamplifier is > turned off. Turning it on and installing > a good external amplifier brings NF down to a very good value. > Applying so much gain at the preamplifiers in front of the mixer will > degrade the intermodulation properties. > Adding an external LNA will block the transmitter path to the antenna. > > The noise figure is the fundamental parameter to specify the sensitivity > of a receiver. All the other, more common, > sensitivity specifications can be derived from it. For example NF=3dB > will give an input sensitivity of > S=-174dBm+NF+48dB=-123dBm for typical NBFM signal. The factor "48dB" > somewhat depends on the test parameters. > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
