> > It's an HP 3048A. I have long held vague ambitions toward > > replacing it with a homebrew digital system but it hasn't happened > > yet. > > > john, KE5FX > > Thanks, John. You have a fortune in first-class equipment!
Thanks -- this stuff is all pretty cheap if you wait by the eBay river long enough. It is more important to have an understanding S.O. than a large equipment budget (the 3048A occupies a 6' rack in what amounts to my living room). > The -105 dBc/Hz at 1Hz looks pretty good. Is that measured with the > internal reference in the 11848A? Or can it even get down that low > at 1Hz? The reference was a surplus 5 MHz Wenzel ULN. It is rated at -115 dBc/Hz at 1 Hz, so was sufficient for these tests. The 11848A's 10 MHz sources have a good broadband floor but are not very stable close-in due to their wide tuning range. The actual measurement is here fwiw: http://www.thegleam.com/ke5fx/cs.gif > If not, I see from your web site you have a Wenzel 80MHz ULN. Did > you use that for the reference? If so, did you ever find out what > was causing the ~10dB excess noise in the regenerative divider...? I'm waiting until I have faster digital noise analysis capabilities before tinkering with the regenerative divider any further. They need a lot of tweaking to perform at their best, rather than being the plug-and-play devices that I originally expected. The results on that page should be treated as provisional. -- john, KE5FX _______________________________________________ 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.
