[BC] Gates Yard schematic or manual

[Phil Alexander]

On 24 Oct 2005 at 23:18, DHultsman5 at aol.com wrote:

>  
> In a message dated 10/24/2005 10:34:55 AM Central Standard Time,  
> charlesr at infonline.net writes:
> 
> There  are differences in the muting relay connections. iirc  the Yard 
> uses  independent muting relay coils and the Gatesway/Dualux put the 
> relay coils  in series.
> 
> 
> 
> In the case of the Dualux,  the relays got their DC supply from the  center 
> tap of the DC return on the full wave rectifier supply.  The relays  were made 
> by running the DC in series with each relay to ground.  When you  turned on 
> the microphone the mike switch contacts shorted around the relay coil  DC, 
> allowing the relay to drop instead of "pulling in", muting the speaker and  turn on 
> the on air lights.   When you turned off the AC to the power  supply the on 
> air lights outside the control rooms and studios would all say "On  The Air". 
>  

UNLESS ... you fed the supply terminals for the lights from the same circuit
you used to feed the PS/mon/mute module. <g>

The really cute part about this way you could mount that chassis in the CR
and not hear the clicks on air via the CR mike because the relays made almost
no noise when they dropped out, unlike when pulling in.


Phil Alexander, CSRE, AMD
Broadcast Engineering Services and Technology 
(a Div. of Advanced Parts Corporation) 
Ph. (317) 335-2065   FAX (317) 335-9037





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