[time-nuts] Samsung GPSDO : Chinese surplus

gandalfg8 at aol.com gandalfg8 at aol.com
Fri Sep 21 12:56:12 EDT 2018

Hi, Nigel
To select GPS as the default input port, it was required to tie PIN 39 (of

50-pin FPC connector) to GND.

Many thanks for the information, I was just coming to announce the same but you beat me to it, sure makes quite a difference knowing that:-)

I don't know if this was already common knowledge, or if it applies to any of the other Samsung versions, but I originally just used the information from the http://tipok.org.ua/node/53 web page and it isn't shown on the diagram there.

To be fair to the seller, they did try to tell me this when I first queried it not defaulting to GPS but a bit of linguistic confusion initially sent me off in the wrong direction.

All is fine now, with pin 39 grounded it does boot up into GPS mode, and there's no more amber Alarm light.
Aside from anything else the Alarm LED still functions as an over and under supply monitor though, which is a nice little bonus, and overall I'm now very happy with this unit, to the extent that I've even bought another one:-)


Many thanks for your explanation of the LINK/EXT situation, I did assume it was related to a non GPS backup but was still intrigued at the possibility that the GPSDO itself might be fed with an external conditioning input, although I suspect that's highly unlikely

I don't know if it will help but I've logged the command set from this one and have also been logging some streamed data and will send that to you off list.

Nigel GM8PZR

More information about the time-nuts mailing list