Martyn Smith wrote: > Bruce, > > Thanks for your input. > > Sorry I still don't understand. > > Could you explain further. > > The spur I inject is single sided (I mix 10 MHz with 10.000100 MHz to produce > 100 Hz) > > So who is right? The spectrum analyser or the HP3048A. > > Best Regards > > Martyn > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > Martyn
With coherent double sideband spurs the DSB to SSB correction is actually 6dB (not 3dB - applies to incoherent (noise) spurs). Perhaps the 3048 is identifying the spur as a pair of coherent DSB spurs and making the 6dB correction. In most cases (modulation of EFC voltage, modulation via OCXO power supply) you will get coherent DSB spurs. The question is if you produce equal amplitude DSB spurs does the 3048 give the correct answer? Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
