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
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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