I apologize for the lack of response. I will get a replacement to you right away. Please reply off-list to confirm your shipping address.
Mike On Fri, Jan 23, 2015 at 02:29:05PM -0700, [email protected] wrote: > > Mike, > > When are you going to respond to those of us who received defective > units? I have sent you a number of emails, and posts here as well, and > you have yet to respond. What's the deal? Please respond with RMA > instructions. > > On 1/23/2015 2:24 PM, Michael Ossmann wrote: > > 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 > > _______________________________________________ HackRF-dev mailing list [email protected] https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
