[time-nuts] Trimble Thunderbolt 1pps

[Chris Albertson]

The "line driver" was a TTL inverter chip  I was going through about 50 or
60 feet of cat-5 wire.
TTL level serial is always marginal, the specs say it should not work but
it does work most of the time.

I found a soave of DB9 connectors that have built-in MAX232 chips on ebay
for under $5.  I use these now in place of the normal DB9 on projects.



On Fri, Jan 3, 2014 at 1:41 PM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> albertson.chris at gmail.com said:
> > The TTL level PPS did not work for me when I tried to drive a long cable.
> >  I used the MAX232 level converter chip to level shift.
>
> Thanks.
>
> How long was the cable?
>
> How solid was the driver?  (How much of the problem was long cable vs weak
> driver?)
>
>
>
> --
> These are my opinions.  I hate spam.
>
>
>
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-- 

Chris Albertson
Redondo Beach, California