Topband: RX loop antenna RX protector

[N4ZR]

I recently saw, in an e-mail from someone, a reference to a commercial 
device designed to protect a receiver on a magnetic loop antenna.  IIRC, 
the device uses PTT from a transceiver to disconnect and/or short the 
input of an SDR.  I think it was made by a company whose main product is 
magnetic loops.

I can't find it now - can anyone help?

-- 
73, Pete N4ZR
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