[time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions

Denny Page denny at cococafe.com
Fri May 18 12:11:19 EDT 2018

Have you considered asking Leo? In my experience, he is very helpful.


> On May 17, 2018, at 19:19, Clay Autery <cautery at montac.com> wrote:
> Anyone who is using one (or both) of these, and/or folks who have a logical opinion:
> *"GPSDO"* - Once configured, unit can run on an external DC source (5-15VDC).  I am NOT using it to power the mast mounted timing antenna.  I don't anticipate leaving unit connected to a computer when not configuring UNLESS I can figure out how to grab data from the unit via the USB port for reporting/analysis.
> Questions:
> 1)  What are the specs of the DC plug on the back?  If I use an external supply, I want to eliminate the addition of yet another SMPS/wall wart to the clutter.
> 2) IF you were choosing a voltage to run JUST this unit on big/short/twisted/ferited leads, what voltage would you choose (regulating down from 13.8VDC or so).  Anything above the required minimum will be converted to heat in either the unit or at the regulator.  Considering this uses a TXCO (I think) and not an OXCO or DOXCO, is running it hotter to try and achieve a more consistent internal temp worth the tradeoff in potentially shortened life of the unit.  (Bottom Line: What voltage will make it run most accurately/consistently?)
> *LeoNTP Networked Time NTP Server* -  Can be powered via USB or PoE according to website.  Detailed specs are seriously lacking.  Trying to wade through how to power it.  USB is obviously 5vdc or a bit less....  But the PoE could be much higher with an internal regulator(s)
> -  I haven't bought my new switch yet, so I can buy one with PoE capability or otherwise inject PoE on the Ethernet cable from the NTP Server to the Gbit switch.
> -  All Ethernet cables in my network are CAT-7 STP (shielded twisted pair) or better.  (Yeah, yeah, I know, wired Ethernet can be noisy, but you do the best you can.  IF wired Ethernet becomes an issue, I can back up to the wireless network.)
> -  Not sure how much I plan to have the unit connected via USB. Beyond curiosity data gathering for a while, I'm thinking at some point I want it to be disco'd and forgotten.  One less potential USB cable radiating or needing ferrites.
> There's more...  but this is a good start.  Just want to try and get parts on the way.  Have to build a separate outboard regulator for the timing GPS antenna, too.
> Thanks!
> -- 
> *Clay Autery
> (318) 518-1389
> MONTAC Enterprises*
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