[AMRadio] Relay

Rick Brashear rickbras at airmail.net
Thu Jun 1 14:47:16 EDT 2006

Thanks again, John.  You could very well be right about the voltage of 
the coils.  The only thing I have to go by until I receive the schematic 
is the previous model (BTA-1R1) schematic and the relays used for the 
same purpose in it are totally different.  They are 4PDT and operate on 
115 vac. 

I am looking to replace these relays.  They are the relays that 
determine the crystal choice in the RCA BTA-1R2 broadcast transmitters. 

I appreciate the help and advise.


John E. Coleman (ARS WA5BXO) wrote:

>	My guess is that the relay coil current is around than 10ma.  If it
>is around 10ma then the voltage would be 24VDC giving it a heat dissipation
>of .24 watts.  This seems all very feasible to me and it may work with as
>little as 12 Volts.  
>	Are you looking for a replacement or are you just trying to get the
>specification to use the relay for some other purpose.  If looking for a
>replacement and you can measure the resistance of the coil then I wonder
>what is wrong with the relay.  Maybe the mechanism is damaged in some way?  
>	There were some latching relays that were used in remote control TVs
>a long time ago.  They were a kind of rotary thing and every time the relay
>coil was energized the relay would go to the next position for a volume
>advance.  There were generally 4 positions and the forth was POWER OFF.
>These were low voltage DC coils which ran from a 20 Volts or less source.

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