[Elecraft] K2 unadvertised feature ?

[Steve Kavanagh]

Does the K2 have a feature where a sufficiently high V RFDET voltage causes the 8R line to go low, thus switching the PIN (1N4007) diodes and protecting the receiver from damage if high power is applied to the antenna socket while receiving ?

If so this would explain the behaviour I have been getting due to RF getting into the K60XV, which I posted at

http://mailman.qth.net/pipermail/elecraft/2009-January/104241.html .

I've done some more measurements with everything disconnected from the K2 except for 12v power and an alligator clip lead used as an antenna connected to the transverter out socket.  Transmitting on another rig on 6m still causes the transverter key out line to be keyed, and I have confiirmed that the 8R line in the K2 is going low.  It seems to take around 100 microwatts to make this happen.  The only explanation that seems to make sense is that this power is detected (V RFDET) and the K2 microprocessor reacts to this by setting 8R low.

Does this theory make sense ?

73,
Steve VE3SMA


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