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

jmfranke jmfranke at cox.net
Sat Sep 21 11:45:12 EDT 2013


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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