TH-315 frequency expansion
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1.  Remove battery and antenna.
2.  Remove screws holding radio together and open radio.
3.  Locate digital circuit board A02-076X-05.
4.  Locate jumpers 1,2,3 and 4.  Cut jumpers 1, 3 and 4.
5.  Reassemble radio.
6.  Reset microprocessor as per handbook.

(Information provided by Peter G8TSY @ GB7MXM)

(Downloaded from GB7SYP)