[time-nuts] FE-5680A Mechanical Question

Bob Camp lists at rtty.us
Thu Jan 12 12:39:55 EST 2012


Hi

With the Rb pulling about 700 ma at 15 volts, it's going to nuke a battery
pretty fast. You may find that (unlike an OCXO) the Rb comes back up to
frequency fairly quickly (minutes /hours not days / weeks). Simply
unplugging it and carrying it power off could be workable approach. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of J. L. Trantham
Sent: Wednesday, January 11, 2012 11:56 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] FE-5680A Mechanical Question

Bill, Brian, Bill, and Peter,

Thanks for the info.  All I need now is a 'project' to incorporate the unit
into.

In the back of my mind, I have the thought of a 'box' that will be battery
powered or 110 VAC powered (perhaps with an internal SLA battery) and
include a GPSDO and Rb unit (possibly a GPSDRbO) for the purpose of a
'reference' for portable operation in the microwave regions.

Ah!!!!  Dreaming!  Makes looking forward to retiring very attractive!

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Peter Bell
Sent: Wednesday, January 11, 2012 10:28 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] FE-5680A Mechanical Question

The pot accessible through the hole in the casing appears is the fine
frequency adjust pot on the older units - on these, it's connected to
an ADC input, but as far as I can see adjusting it does nothing at
all.

There are two screws hidden under the labels that hold the top over on
- you also need to remove the two small screws on the side that bolt
the D-type mounting bracket in place.

Regards,

Pete Bell


On Thu, Jan 12, 2012 at 10:33 AM, J. L. Trantham <jltran at att.net> wrote:
> Boy!!!!!!!  I would have 'screwed' that up!
>
> Bill was correct.  Mine were 1/16th inch Allen screws, not Torx as Brian
> has, and were very easily removed.  They appear to be 3mm dia. X 5mm long
> with a 0.5mm pitch screw, in spite of having a 1/16th inch hex opening.
>
> There were two Phillips head screws underneath that appear to hold the
> bottom cover in place.
>
> On another topic, there is a small opening on the side (near the
> 'FE'Trademark) with what appears to be a multi-turn pot inside.  What is
> that?
>
> Also, the 'sticker' on the top, that includes the 'FE' Trademark,
> 'FE-5680A', etc., has a 'soft spot' on the bottom edge.  In addition,
there
> is a 'soft spot' under the 'sticker' at the bottom of the front, near the
> connector, and includes the serial number.  Does anyone know what is under
> these 'stickers'?
>
> Thanks again.
>
> Joe
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Brian, WA1ZMS
> Sent: Wednesday, January 11, 2012 8:52 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] FE-5680A Mechanical Question
>
> My "rivets" were tiny Torx screws.
>
>
> -Brian, WA1ZMS
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of J. L. Trantham
> Sent: Wednesday, January 11, 2012 9:22 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: [time-nuts] FE-5680A Mechanical Question
>
> Should I ever have time to pursue the Rb unit, what happens when I 'drill
> out' all the rivets that mount the unit to the PCB that it arrived on?
 Any
> reason to keep it on the PCB?
>
>
>
> Does the bottom cover come off?  Will I need to replace the rivets with
> something else to keep the bottom cover on?
>
>
>
> Thanks in advance.
>
>
>
> Joe
>
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