[ARC5] BC-669 Project for Veteran, That "Homer Moment" "DOH!!"
Brooke Clarke
brooke at pacific.net
Mon Sep 23 18:45:48 EDT 2019
Hi Dave:
Is the relay wired into the 12V system, or does it run from 115 VAC through some circuit that limits the voltage/current?
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
>
> You know, I've revived a few BC-669s. It's been awhile. This "buzzing relay" issue kept nagging me. I felt I had
> seen it before, but just couldn't pull the memory out of the cob-webby, dark and yawning abyss between my ears.
> Happens all too often these days. All the manuals say it's a 115VAC relay. Its connection in the circuit says that
> should be so.
>
> Thank you, Bill, for the clue about the "shaded pole-" a metal ring physically connected to the relay pole piece which
> acts as a "shorted turn:"
> "...a copper "shading ring" wrapped around the end of the
> pole piece. The current induced in the shading ring delays
> the decay of the magnetic field long enough
> to smooth it out between cycles."
>
> Well, the relay was dirty and the contacts were intermittant anyway, so decided to pull it out, clean and inspect it.
> The relay did not look like a ham mod- it looked professionally installed, following Signal Corps standards. Got it
> out, took a close look at the coil and... No shading ring. Hmmmm... Started with a little naptha, brushing the crud
> away from the sides of the coil, and these letters emerged from their dirt and dust covering: "12 VDC." "DOH!!!!"
> That's when the memory came back, leaping out of the darkness, laughing at me and making-fun of my decrepit
> grey-matter. I had seen this before. Now as then, I've scoured the manuals trying to find why this change was made.
> Nothing. I could have missed it...
>
> Anyways... Maybe it was done because these were used mobile? But why do that? Yes; the rig has a vibropak to run the
> receiver from 12VDC, but that won't run the transmitter, so why change the antenna/TR relay? No use for it without
> 115VAC power to the transmitter transformers. Now I don't remember what I did about this in the past. Guess I'll
> have to open-up my station set and look, after which *another* memory will bush-wack and embarass me. I'll let you know.
>
> 73 OM DE Dave AB5S
>
>
>
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