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

Bruce Griffiths bruce.griffiths at xtra.co.nz
Mon Feb 8 00:45:26 UTC 2010


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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