Since you haven't provided enough information on the application of your TK-350 UHF handheld portable, any of us would be second guessing how you plan to use this radio. I did a quick check on the portable and it's use in the Commerical Land Mobile Radio Business Band above 450 MHz. If you are using the handheld on Simplex - Tx/Rx on same frequency, talking to another handheld, perhaps 2~2.5 Air Miles Line-Of-Sight in an open terrain without any tall buildings. Hills, Trees, Tall Buildings of Concrete / Steel and wearing the portable handheld at waist level will attenuate the signals in both directions, therefore reducing your radio's coverage.
Here's the specifications on the Kenwood TK-350 Handheld:
http://www.amnet.net.au/~mackat/kenwood_tk.html
I think you will be required to contact your local Kenwood Land Mobile Two=Way Radio Dealer for the Manuals, Schematics and Programming Software.
Dan




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