[time-nuts] Bodnar "Precision Frequency Reference (GPS Clock)" AND LeoNTP Networked Time NTP Server Questions
cautery at montac.com
Thu May 17 22:19:53 EDT 2018
Anyone who is using one (or both) of these, and/or folks who have a
*"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.
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
*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.
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