February 3, 2011

For want of a nail..

Sorry to have been gone so long. 

This is mine. I got it cheap. It broke. I fixed it. I learned how to fix these type of things. That's what I have been doing..

..now I gotta go back to the shop. See you soon.

UPDATE: Honest to goodness, folks, I have been engaged in this effort as a semi-vacation from the political blog world. I would say for sanity reasons but that would be a slight prevarication. The little radio I was building wasn't checking out at the various build points and I had to debug it. Not to convey the impression that I know squat about electronics or troubleshooting radios -- I am a relative neophyte in that department -- but I give it a shot from time to time.

So, anyway, while checking out the VFO on this rig, I suddenly noticed that my trusty, rusty Tek 2445's display was quivering weirdly and the horizontal sweep was somewhat jerky. Here's the checkout config on a good day:

So, I put the radio away and popped the covers on the scope. After some head-scratching, RTFMing, swearing, and hallelujahs, I extract a couple of electrolytic caps, replace them and power the beast back up. Well,  I won't have to worry about the "don't fix it if it ain't broke" bromide any more because the 2445 was definitely broke after I fixed it.  

More head-scratching, manual-reading, etc. led me to a bad resistor in the +42V supply. Replacing it yielded the picture up at the top of this post and I'm back in biz, right?

..well, in the process of re-installing the scope back into the bench, I pulled my old surplus AN/URM-25D signal generator, noticed that the power cord was bad, did an R&R, and..


But it's fun and it take one's mind off of Obama and the rest of the clowns in D.C. busy ruining our lives. But I'll be back once I fix all of my test equipment.



  1. Big nail. No wonder your horse limps!

  2. Thank you for gracing us with you presence. Do you need to borrow my brad nailer?

  3. Is the sine wave a test signal or was that output from the radio?

    Anyway, it's nice to see you back in the saddle.