[ntp:questions] Very large jitter and offsets on GPS ref clock after upgrade to "p5"

Chris Albertson albertson.chris at gmail.com
Sun Jan 8 19:20:51 UTC 2012


On Fri, Jan 6, 2012 at 1:54 PM, E-Mail Sent to this address will be
added to the BlackLists <Null at blacklist.anitech-systems.invalid>
wrote:
> On 1/6/2012 12:28 PM, unruh wrote:
>> Eg, your encore pluse is a TTL level pulse (0-3 volt transition)
>
> I thought he indicated he had a Oncore UT+ ?
>
>  The M12M Oncore specs TTL interface (0 to 3 V)
>  The UT Plus Oncore TTL specs TTL interface (0 to 5 V)
>  The GT Plus Oncore specs TTL interface (0 to 5 V)

I have a UT+  It does 5V logic level pulses but I connect the TTL
level PPS to a MAX232 chip which converts the levels to +/- 8 volts

I think the problem is my long cable.  I'm pushing about 80+ feet of
cat-5 cable.  Looks like I will either have to move the equipment or
use RS422 drivers at each end.  I'm going to try moving the equipment
to where I can use a quality 4 foot cable.

>
Chris Albertson
Redondo Beach, California


More information about the questions mailing list