[time-nuts] HP Z3801A - How to convert the 1PPS & 10MHz Differential Pseudo ECL Output?

[John Ackermann N8UR]

I didn't convert the PECL signals, but instead went inside the unit and
tapped off the 1pps and 10MHz signals.  I have details at
http://www.febo.com/time-freq/gps/z3801a/mods/index.html

John
----

Don Mimlitch said the following on 04/09/2006 08:41 PM:
> I have a HP Z3801A which outputs the 1 PPS and 10MHz as Differential Pseudo ECL. What is this?
>   
>   How do I access these signals? How do I convert them to TTL or CMOS  Levels. Are there any IC's (DIP Package) to do the conversion? For  short cable runs (2 or 3 Ft.)  is there a simple circuit for  conversion? Also, how might I convert the 1PPS to an RS232 Level. Can I  use an RS422/RS485 converter?
>   
>   I should mention that this unit was converted to RS232 for the RS422  transmit/receive signals which includes a jumper header with only 6 of  the jumpers inserted. I wonder if the Z3801A already has circuitry to  convert these signals like it does for  the RS422 to RS232?
>   
>   Any help would be appreciated.
>   
>   Thanks
>   Don Mimlitch
>   donmeis at yahoo.com
>   
> 		
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