[Central-Electronics] Relay Question on Early CE Exciters

[George Maier]

Hi Lynn:

The confusion comes from the fact that similar designations are used for 
the terminal strip on the rear panel, and for the internal CE relay.  
Later 20A's included a standard 110VAC socket on the rear panel 
specifically wired to support an antenna relay; some 10B's were factory 
modified with the same change.  One side of the relay socket is wired 
directly to AC common, the other is wired to the AC hot lead but it's 
switched via pins 4 & 5 on the internal 10B/20A relay.   If you go to 
the 20A section on BAMA and download the file titled "20A_changes"  ( 
http://bama.edebris.com/manuals/ce/20a/ ) it should become clear in a 
big hurry.

Neither my 10B or 20A's have the nice 110VAC socket, so I've 
disconnected the RF leads to the the two position terminal strip 
adjacent to the UHF RF output coaxial connector on the rear apron.  That 
little strip is now used as the interface point to power a 110 VAC 
relay, after making the AC wiring mods  per the "20A changes" file.  
This keeps the form C contacts on positions 8. 9, and 10 of the rear 
terminal strip available for other functions.  If your antenna relay 
also has aux contacts, it's a real bonus.

73 & good luck, hope to see you in Jonesborough again!

George - W1LSB


On 4/1/2013 4:06 PM, Lynn Fisk wrote:
> Gentlemen, I'm trying to get up and running, a very modified 10B exciter, and I plan to use it to drive a home brew grid driven pair of 4-400s that I did not build either.  I don't have enough relay contacts to make it all work.  I'm confused by the schematics and the socket on the later exciters which supplied 110V for an antenna relay.
>
> My 10B schematic states that back panel contacts 8, 9, 10 (spare contacts) should be used for changer-over realy.  And contacts  4, 5, 6 for speaker/bias issues.  Yet that same schematic shows a set of relay contacts 4, 5, 6 connected to nothing.
>
> And my 20A schematic also shows contacts 4, 5, 6 duing speaker and bias duty, but this one shows a set of contacts 4, 5, 6 now supplying 110V relay voltage to a socket on the back panel.  Are there two sets of relay contacts numbered 4, 5, 6?  What am I missing here?
>
> I need to fire up a 110V antenna relay with no extra contacts, and I need all the contacts I can get.
>
> Thanks, Lynn (K5LYN).
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