Hi Poul-Henning, On 2020-08-04 12:35, Poul-Henning Kamp wrote: > -------- > Magnus Danielson writes: > >> If that is the range you aim to improve, then I strongly recommend you >> do re-read the postings I did about phase noise in detector range, as I >> have showed that phase-noise get's mixed down to DC and increase the >> noise there. With very ugly and hand-wavey hack I was able to >> significantly reduce that noise essentially by cleaning up the >> phase-noise. > Ohh, absolutely. > > My plan is to put a modulated DDS synth in to get a much more modern > detector system.
That would help naturally, given that OCXO phase-noise is well taken care off. I'm considering swapping out the 00105 oscillators, way too much noise to be useful. > But right now the zener on my a15 is better at measuring temperature > than holding voltage stable, so I'm addressing that first. > > See the 3rd graph here: > > http://phk.freebsd.dk/hacks/HP5065A/20150908_a15/ > Temperature measurements is nice. :) Yeah, I've seen that too. >>>> I would go for the LTZ1000 if you can. The LM399 has gone out of >>>> fashion for a reason: [...] >>> Yes, I know, being also a volt-nut :-) >> I have not yet jumped down that rabbit-hole as I am by far not done with >> the current one. :) >> >> I've been looking at the LTZ1000 and one day I may get some. > You *really* want the version of it which is packaged in the attractive > and *incredibly* useful "HP3458A" cabinet :-) > How nice of HP ehm Agilent to supply it in a pre-packaged format with some auxillary functionality to go with it. :) Yeah, I got a pair of "HP3457A" cabinets here, but so far no "HP3458A" cabinet. Hopefully soon enough. Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
