[Kenwood] Is at-250 r.f. sensing?

[k8vf_mark at centurytel.net]

I recently sold my at-250 to a fellow who wants to use it with a ts 
830. 


I sent him the connection diagram in advance via email, and sent the 
manual with the tuner. 
He says it doesn't work. 


I found out he did not make the cable as he says it should be r.f. 
sensing and should work without any connection. 


Another fellow told me he is correct. 


I dont remember this feature. My recollection is that the tuner must be 
triggered by the radio. 


Am I correct, or is the at-250 r.f. sensing and will work with ANY rig 
without connection?(other than coax of course) 


Thanks to you all. 


K8VF