[time-nuts] Ball/Efratom MFS-209 Rubidium GPSDO...

Tom Miller tmiller11147 at verizon.net
Wed Dec 24 10:47:17 EST 2014

Nice work Chuck. So now you have a many port house reference that should 
last for many years. My unit took a long time to start from cold, I think it 
is operating in position mode and takes time to settle on the location.


----- Original Message ----- 
From: "Chuck Harris" <cfharris at erols.com>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Wednesday, December 24, 2014 1:42 AM
Subject: Re: [time-nuts] Ball/Efratom MFS-209 Rubidium GPSDO...

> It's Alive!!!
> The MGPS module was saying there was an A-to-D fault
> and a Feedline fault.  Suspicious of the common element,
> I traced the signal path from the GPS antenna connector
> to the input of the ADC, and it was a straight DC path.
> Sure, there were a few chokes, and capacitors to ground
> to filter out any stray 1.5GHz signal, and to keep the DC
> circuitry from loading the antenna signal.
> I ordered up a new ADC converter, which was an ADC0808 by
> National and TI.  A small 28 pin quad J lead surface mount
> package.  It finally came, and I swapped it out this
> afternoon.

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