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

[Mark C. Stephens]

There is a problem introduced if you sink too much current off the lock pin.
An LED draws enough current to cause the issue, I think to do with not going into lock or PPS output.
If I could just remember what the issue is...

Anyway, this guy has it nailed:  http://www.ka7oei.com/10_MHz_Rubidium_FE-5680A.html

Except, the ones that I have that need a +5V supply are programmable. Go figure..


--marki


-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Azelio Boriani
Sent: Sunday, 22 September 2013 1:25 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Loop Lock Indicator

If the lock output comes from the micro or a logic port with a maximum output of 3.3 or 5V, a LED connected to it from +15 will be always ON.

On Sat, Sep 21, 2013 at 4:55 PM, Bob Stewart <bob at evoria.net> wrote:
> 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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