[hpsdr] External disable of Penelope RF output?

[n3evl]

I'm contemplating some kind of high swr detection circuit in an external 
homebrew amp.  I've seen some designs that detect hi swr and block RF 
from the driving rig by using the ALC line.  Since Penelope does not 
have an ALC line, is there some way an external device can tell Penelope 
to cease generating RF?

I see Penelope has pin 1 on the DB25 connector labeled as "PTT Input - 
active when connected to ground" - but I'm not sure if this is relevant 
to this issue or how this pin is used.

Thanks,

Pete, N3EVL


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