Nico, this is truly exceptional phase noise performance! My sincerest congratulations to you. Have you described how you achieved this somewhere?
73, Bill W4ZV Nico Palermo, IV3NWV wrote: > > Bill, > the phase noise of Perseus is as follow: > > Offset (kHz) 2 5 10 20 >50 > Phase Noise (dBc/Hz) -141 -145 -148 -151 <-155 > > As a picture is worth one thousand words, see here for more: > > http://microtelecom.it/perseus/tests/Perseus-phasenoise.jpg > > To make the test, the phase noise of the source generator, > a homebrew crystal oscillator, has been neglected and it has been assumed > that all the phase noise was due to the receiver oscillator, which is a > crystal > oscillator too. > > A more realistic assumption is that the two oscillators, the source > generator > and the receiver LO, are contributing equally to the phase noise figure > and > in this > case the performance of the receiver would be even 3 dB better. > The figures indicated are thus worst case values. > > For offsets larger than 50 kHz the phase noise performance cannot be > really > measured as the prevailing source of noise is of thermal origin and the > noise induced by the reciprocal mixing is below the receiver thermal noise > floor. > > Now that you can compare the full table, it would be not difficult for you > to conclude > that even at 1 MHz offset, the blocking dynamic range of Perseus is > greater > than > that of your receiver. > > > 73 > Nico Palermo, IV3NWV > > >>Would you tell us how Perseus compares in the following phase noise >>performance? > >>The following table is from a post by Eric WA6HHQ in September 2007. I've >>added the Flex 5000 based on measurements published after Eric's note: > >>http://mailman.qth.net/pipermail/elecraft/2007-September/073931.html > >>"Here are transmit composite phase noise numbers from the Lab for the K3. >>Needless to say, we are pleased with the results. :-) I've also included >>some numbers from the ARRL reviews for several late model rigs. > >>Rig 1kHz 2 10 20 50 100 1M >>K3 -110 -119 -136 -140 -143 -144 -150 >>IC7800 -103 -112 -130 -138 -140 -140 -140 >>FT2000 -102 -105 -128 -129 -128 -128 -128 >>ORION 2 -121 -129 -126 -125 -118 -128 -138 >>OMNI 7 -102 -103 -120 -123 -127 -129 -126" >>F5000 -123 (same at all spacings de W4ZV) >>Perseus ? > >> >> > > _______________________________________________ > Elecraft mailing list > Post to: Elecraft@mailman.qth.net > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > -- View this message in context: http://n2.nabble.com/K3---ADAT-ADT-200A-by-HB9CBU-tp1597981p1614902.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
