[Premium-Rx] muting the rf-590?

[Steve Sykes]

In my schematic for the 590A, the mute is pulled up by a 10k resistor 
via a diode.  The mute line goes into the base of a 2N2222A transistor.  
I believe the 590H is the same.
Steve
ehertz wrote:
> Hi all, I am looking to integrate my RF-590H into my ham shack.  i see there is a mute input on the rear terminal strip which I would like to actuate from my TR relay.  The manual doesn't explicitly say how to actuate this externally, but does mention an internal mute that needs +5V TTL input. 
>
> I am hoping (praying) that the external mute function has some kind of pull up resistor and all I need to do is ground it.  Can anyone confirm? Otherwise, I will have to find a way to supply +5V to it when the TR relay fires.  If 5V is infact needed, perhaps it can be borrowed from some other connector signal supplied by the 590? 
>
> Any and all (or no) info appreciated
> thanks
> Eugene
>
>
>
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