[time-nuts] LadyHeather Cabledelay - positive or negative ?

Azelio Boriani azelio.boriani at screen.it
Thu May 3 18:49:43 UTC 2012


Exactly. The best is to test. I like the uBlox LEA-5T "user delay" to place
the PPS where I want. Useful for our TICs (including in the list the
HP5370A, the E1740A and the GT4000) that usually wrap around the second
when the PPS under test "slides" under the reference.

On Thu, May 3, 2012 at 7:59 PM, Bob Camp <lists at rtty.us> wrote:

> Hi
>
> Quick check:
>
> 1) Fire up two TBolts, hook up a scope between the PPS's (trigger on A,
> watch B)
> 2) Change the antenna delay by +500 ns on B (needs to be N x 100 ns).
> 3) Pulse moves early or late . If it moves early then it's compensating for
> 500 ns of cable delay.
>
> Bob
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Mark Sims
> Sent: Thursday, May 03, 2012 1:24 PM
> To: time-nuts at febo.com
> Subject: [time-nuts] LadyHeather Cabledelay - positive or negative ?
>
>
> The documentation says that you should use negative values to compensate
> for
> the cable delay,  but  all of my units were removed from service with
> positive or zero delays set.  Lady Heather sort of assumes positive values,
> but you can enter negative ones.  Which is correct remains a mystery since
> I
> don't have a trusty independent reference to compare to.
>
>
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