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OK.....I have never done this in a dual band set-up. I have done plenty of each by themselves. Here is how I have it set......TK-730 has the KRK-4DB dual port front, TK-630H has the single port KRK-2 plate. Which one do i set as radio-1 and which is radio-2? When I program in the highband freq's evrything is OK on TX and RX, but any lowband stuff I put on the radio acts lik VCO is out of lock. I can set the 630 radio back to singleband and everything is fine from 42-54 MHz.It seems as if all the freq's are going into the highband radio. Can someone give me some guidance on programming the dualband correctly?? It will be slack set-up and I will have 2-meter, 6-meter with advanced head......if this programming gets sorted out.