[time-nuts] FE-5680A Loop Lock Indicator

[Bob Stewart]

Hi John,

Thanks for the response.  I don't think my unit is the same as that one.  The instructions I got did not mention any +5V.  Also, this is not a 10MHz unit, it is only a timing unit.  The internal frequency is 8.38860798/9 (last digit jitter) MHz.

Bob





>________________________________
> From: jmfranke <jmfranke at cox.net>
>To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Saturday, September 21, 2013 10:45 AM
>Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator
> 
>
>Are you applying +5V to pin as well? See:
>
>http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:fe5680a_faq
>
>        "Within 5 minutes after powering up (apply +15V on DB9 pin 1 and +5V on pin 4) the unit should indicate lock (pin 3 voltage drops low)."
>
>John WA4WDL
>
>--------------------------------------------------
>From: "Bob Stewart" <bob at evoria.net>
>Sent: Saturday, September 21, 2013 10:55 AM
>To: "Bob Stewart" <bob at evoria.net>; "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
>Subject: [time-nuts] FE-5680A Loop Lock Indicator
>
>> The instructions I got with this Rb said that you could hook an LED through a 5-10K resistor to the +15 supply and get a lock indication. I'm using a 10K resistor and the LED lights as soon as it's powered up from cold. Is the loop lock indicator circuit broken or is it just another strange option for these things? I saw on one site that if you do it this way it prevents lock, but mine seems to lock OK with or without the voltage.
>> 
>> 
>> Bob - AE6RV
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