Monthly Archives: October 2011

GPSDO – progress

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[Today’s run: rest day]

I made a bit more progress on the GPS-DO.  I now have the first chain of the power supply working.

The power switch works.  The rectifier and filter capacitor are doing the job.  I have 24 volts going to the crystal oven.  I used the ripple calculations in EMRFD and the ripple was about 10% until the oven gets warmed up and drops the current.  Then things flatten out nicely.

I have a bunch of boards to mount in my chassis.  And I have to wire the various parts together.  This is always a difficult step in any project I tackle.  I don’t have a large collection of connectors so I end up using a lot of point-to-point wiring and it usually looks nasty.  I’m thinking about putting in a couple of terminal strips for the various voltage levels.

But I haven’t broken anything yet, that I know of.  So keep moving forward.

Today I also reviewed the ARRL VE information.  I’m supposed to help at a test on Saturday.  I signed up as a VE long ago and have never used my certification.  So I figured I had better do a review.

 

 

Filed under Ham Radio
Oct 31, 2011
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