On Wed, Mar 28, 2018 at 9:49 PM, Tisha Hayes <tisha.ha...@gmail.com> wrote:
> Perry and I would make our pilgrimages to the Huntsville Ham Fest and > usually I ended up buying equipment from him. One of the items he sent my > way was an HP 3586B that I am finally beginning to put to use. > Hmm that measuring receiver model (diffs can be found in: http://www.militaryradio.com/manuals/HP/hp3586-a-b-c.pdf ) was apparently intended for testing and troubleshooting purposes for those ancient FDM-based POTS trunk systems, not as a general-purpose HF measuring receiver (the HP 3586C)---I'm not sure how well they would function as HF receivers for WWV and CHU following impedance adaptation (b/c it doesn't have a 50 ohm unbalanced interface). In my case, I supply my time transfer volunteers with the following setup: vertical antenna -> TVSS -> preamplifier -> military rackmount preselector -> military/intelligence rackmount parametric demodulator or HP 3586C -> Xeon NTP server via soundcard with GNU/Linux daemon software which commands the preselector and demodulator via GPIB. Still, WWV/CHU-derived public NTP nodes are virtually nonexistent, and therefore there's a strong need for them, regardless of the sophistication of the receiver, due to the pitfalls of GNSS. -Ruslan -- Ruslan Nabioullin Wittgenstein Laboratories rnabioul...@gmail.com (508) 523-8535 50 Louise Dr. Hollis, NH 03049 _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.