[time-nuts] No 1 PPS output on a Tbolt

Robert Darlington rdarlington at gmail.com
Mon Feb 8 15:15:32 UTC 2010


Try hooking the output to an LED.  It's very difficult for me to see the
pulse on my analog scopes but there is no arguing with the blinking light.

-Bob

On Mon, Feb 8, 2010 at 8:05 AM, SAL CORNACCHIA <salccor at rogers.com> wrote:

> Thank You John, I have tried with different sweep speeds both above and
> below 100 us/div, the problem appears to be no output at all.
>
> Best regards,
>
> Sal C. Cornacchia
> Electronic RF Microwave Engineer (Ret.)
>
>
>
>
>
>
>
> ________________________________
> From: John Ackermann N8UR <jra at febo.com>
> To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> Sent: Sun, February 7, 2010 8:45:06 PM
> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
>
> Sal, what sweep time are you using on the scope?  I believe the TBolt
> PPS is only microseconds wide, so you may need to speed up the sweep
> time to around 100us/div or faster to see it accurately.  And you may
> need to mess with delaying the sweep to get the pulse on the screen.
>
> John
> ----
>
> SAL CORNACCHIA said the following on 02/07/2010 08:32 PM:
> > I cannot measure anything, with the scope set at max sensitivity, there
> is only a tiny dot indication every second.
> >
> > Best regards,
> >
> > Sal C. Cornacchia
> > Electronic RF Microwave Engineer (Ret.)
> >
> >
> >
> >
> >
> >
> > ________________________________
> > From: Bruce Griffiths <bruce.griffiths at xtra.co.nz>
> > To: Discussion of precise time and frequency measurement <
> time-nuts at febo.com>
> > Sent: Sun, February 7, 2010 7:45:26 PM
> > Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >
> > Any idea what the pulse shapes you see is with a 1M load and with a 50
> > ohm load?
> >
> > Bruce
> >
> > SAL CORNACCHIA wrote:
> >> Hi Didier,
> >>
> >> When the 50 ohms termination is switch on the oscilloscope there is a
> tiny positive dot deflecting every second, it appears to have a very low
> output.
> >>  Best regards,
> >> Sal C. Cornacchia
> >> Electronic RF Microwave Engineer (Ret.)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> ________________________________
> >> From: Didier Juges<didier at cox..net>
> >> To: Time-Nuts<time-nuts at febo.com>
> >> Sent: Sun, February 7, 2010 11:51:15 AM
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> The pulse is narrow, but it should be a full 5V amplitude. The driver is
> pretty beefy, the amplitude does dot drop appreciably when loaded with 50
> ohms on mine.
> >>
> >> Didier KO4BB
> >>
> >> ------------------------ Sent from my BlackBerry Wireless thingy while I
> do other things...
> >>
> >> -----Original Message-----
> >> From: SAL CORNACCHIA<salccor at rogers.com>
> >> Date: Sun, 7 Feb 2010 08:42:49
> >> To: Discussion of precise time and frequency measurement<
> time-nuts at febo.com>
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> Hi Bob,
> >> The pulse is barely visible on the Tektronix 485 it appears to be a very
> low output.
> >> Best regards,
> >> Sal C. Cornacchia
> >> Electronic RF Microwave Engineer (Ret.)
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> ________________________________
> >> From: Bob Camp<lists at cq.nu>
> >> To: Discussion of precise time and frequency measurement<time-nuts at febo.
> .com>
> >> Sent: Sun, February 7, 2010 11:26:16 AM
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >> Hi
> >>
> >> The 5345 should see it if it's set to 50 ohm termination and DC
> coupling.. A
> >> sweep of the trigger from about 1.5 to 3.5 volts should show it there
> over
> >> most of the sweep.
> >>
> >> Bob
> >>
> >> --------------------------------------------------
> >> From: "SAL CORNACCHIA"<salccor at rogers.com>
> >> Sent: Sunday, February 07, 2010 11:06 AM
> >> To: "Discussion of precise time and frequency measurement"
> >> <time-nuts at febo..com>
> >> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>
> >>
> >>> Oscilloscope and 5345A Counter, the Tbolt software shows all green.
> >>>    Best regards,
> >>> Sal C. Cornacchia
> >>> Electronic RF Microwave Engineer (Ret.)
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> ________________________________
> >>> From: "Stan, W1LE"<stanw1le at verizon.net>
> >>> To: Discussion of precise time and frequency measurement
> >>> <time-nuts at febo.com>
> >>> Sent: Sun, February 7, 2010 10:47:42 AM
> >>> Subject: Re: [time-nuts] No 1 PPS output on a Tbolt
> >>>
> >>> Hello Sal,
> >>>
> >>> What are you monitoring the PPS output with ??
> >>>
> >>> It is a short duration pulse.
> >>>
> >>> What does the TboltMON software (available at the trimble website) show
> ?
> >>>
> >>> What does Lady Heather indicate ?
> >>> (She is just waiting to massage your numbers.)
> >>>
> >>> Stan, W1LE
> >>>
> >>>
> >>>
> >>>
> >
> >
> >
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