[Elecraft] Operating temperature range

[Igor Sokolov]

I have both K3 and KX3 and I sometimes use them outside in a field 
operation. Here in Russia we have one funny QRP contest called  "Frost-red 
nose" where extra points are given for low temperature environment during 
field operation. The contest happens in January when in some places 
temperatures can be down to minus 30 C. I did not find temperature 
requirements for K3/KX3 in the specs. Can somebody give me a hint or may be 
share own experience. What would be the lowest temperature where the rig 
will still perform adequately?

73, Igor UA9CDC