Looking at the pictures it is the same unit I bought. It is not dual oven bit trimble works with LH right now shows tracking 10 satelites.Attached is data that made me buy a second one for Jürg for $ 129 and one more for me for $9.50.What you see is highly filtered data to see long time changes to better understand if analog filtering os possible. Planning on using Wenzel 600 sec. Filter maybe up to 2000 seconds. Board is ready for order.Top plot is my data against my Cs 5061B bottom is original Tbolt against his FTS Cs. We use 53132 counters.I think the new one lends it self better for filtering looking at both with my Tracor, Trimble uses a much shorter time constant and no short 1E-10 changes you see on our standard units.Will keep you posted Bert Kehren
Sent from my Galaxy Tab® A -------- Original message --------From: Tim Shoppa <tsho...@gmail.com> Date: 4/10/18 6:46 AM (GMT-05:00) To: Discussion of precise time and frequency measurement <email@example.com> Subject: Re: [time-nuts] Dual GPSDO - any advantage? Most of the Chinese cheapo units have been frequency, not phase locked. It would be great if you could put the GPSDO outputs into a 2 Channel scope and eyeball them for a while to see if they appear in phase (say plus-minus 20ns) over a few hours. Tim N3QE > On Apr 10, 2018, at 1:43 AM, donald collie <donaldbcol...@gmail.com> wrote: > > I`ve just bought two GPSDO`s from China @ US$9-50 each [This is not an > error!] They are stated as being new, and use a Trimball dual oven OCXO. I > plan to run these in parallel [2 antennas, 2 feedlines, and 2 GPSDO`s] It`s > been said that a man with two watches is never happy - unless, of course, > they agree with each other ;-). Being identical the outputs should be > coherent, unless one becomes faulty [one advantage of having two - any > discrepancy and you know something must be wrong]], but is there some > crafty way I can squeeze a little more "accuracy" out of two than if I only > used one? > TIA for your comments............................................Donald > Brett Collie ZL4GX > > PS : I have no connection to the eBay seller. The US$9-50 seems to include > a basic puck antenna, long downlead, and 4 interseries adaptors > _______________________________________________ > time-nuts mailing list -- firstname.lastname@example.org > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- email@example.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Filter 500 Tb + Tb2.pdf
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