[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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