[time-nuts] z3801a gps signal reflection and EFC woes

[mike cook]

Nice idea.
 I do have a couple of M12+T, so I could try, but they are not pin or voltge 
compatable with the VP so it might require
some surgery. However I do have a couple of UT+ which are and it should be a 
drop in replacement. They are  pretty much command compatible aswell and may 
be able to isolate reflections better than the VP. I suppose it depends on 
what the Z3801A tries to do in the way of configuration whether it could 
work or not. It shouldn't hurt to give it a try.



----- Original Message ----- 
From: <SAIDJACK at aol.com>
To: <time-nuts at febo.com>
Sent: Thursday, December 03, 2009 2:41 AM
Subject: Re: [time-nuts] z3801a gps signal reflection and EFC woes


>
> Hi guys,
>
> I wonder if anyone has ever replaced the 1PPS output of the oncore with an
> external 1PPS from say an M12M receiver.
>
> I would suspect all else being the same that the Z3801A would work much
> better, and not have the problems Mike is seeing?
>
> bye,
> Said
>
>
> In a message dated 12/2/2009 04:46:58 Pacific Standard Time,
> michael.cook at wanadoo.fr writes:
>
> You can  see that the EFC immediately tries to follow the value calculated
> during the  incident, regardless of any historical data the box is 
> holding,
> if any. I  haven't yet checked to see how much the violent swing in EFC
> effects  the  10MHz output, but I suppose there must be some.
> I have tried 2 different  VPs  , but they appear to be suffering the same
> issue. Both have  different firmware levels.
>
> Anyone seen this and know of a way of  limiting the effect? I have thought
> about moving the Z3801A to my south  balcony, where I shouldn't see so 
> many
> reflections, or better, to the  appartment roof, but that needs permission
> from the  management.
>
> Mike
>
>
>
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