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Step Forward, Then Back

Another week has gone by and wouldn’t you know it, that exciter of last week made me take a step back.  That Superciter was working just dandy on the bench when I shut down on Friday of last.  I had it up to 30 watts running happy as a clam (wherever that phrase came from) into a load.  All afternoon it ran until I pulled the plug for the weekend.  Come Monday of this week, Mr. Murphy struck.

As usual with these things, I felt I should run another bench test before calling this exciter good.  Plugged it in and let it run.  It started out just fine at 30 watts.  I’m happy that nothing changed while it sat doing nothing for a weekend.  We all need time off.  I wander through the shop while doing other things.  I walk right by the bench late morning and stop.  Take a couple steps back and look at the forward power.  16 watts!  Huh?  Fan is working and I pop the top open.  Not heat.  Shoot, it’s even sitting under an air conditioning vent.  Time to pull it apart and take the test point readings.  I start to see a couple of anomalies, though for the most part all readings were good.

I sit down with the schematic and refresh my brains on the previous week pointers on what drives what and who and where.  Take a couple more readings as I watch the power drop down below 10 watts.  Something is failing and failing slowly.  No faults, just no power.  OK, if those don’t get enough drive what happens?  I’m starting to get the feeling there is a drive issue.  Why it didn’t show last week is interesting.  I have a brief email exchange with GatesAir.  I describe the situation and how it changed from last week.  The same conclusion that something is not giving enough drive.  We are going t concentrate on the RF drive produced by the FM Synthesizer board.  I have a couple of parts ordered, so we wait until they arrive.  Let’s see if this takes care of it.

In the meantime, we had our annual fire inspection.  Meetings.  A last minute invite to Al Salci’s (of SAS fame) presentation of AVB (Audio Video Bridging) was a highlight.  Great presentation if you get a chance to witness it.  At least I had time off from wrestling with that exciter!  Every week is a learning experience, so take advantage when you can.  Next week more meets and greets.  Let’s see what I learn and maybe even get an exciter repaired.

Cheers!

Categories: Equipment, Management Tags: , , ,
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