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.
Regards
----- Original Message -----
From: "Chuck Harris" <cfhar...@erols.com>
To: "Discussion of precise time and frequency measurement"
<time-nuts@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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