Yaesu_HM-48_PTT_mod.pdf

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1、PTT Lock for FT-8800 & FT-8900 Mic: The annoying lock function only locks the DTMF buttons and the FUNCTION buttons, leaveing the PTT button unlocked for you or others to accidentally transmit. This simple mod locks the PTT button and the user programble buttons, but leaves the DTMF buttons unlocked

2、 when the lock switch is switched on. The picture below shows the solder blobs before and after the mod: In the factory setup, in the solder joints near the lock button, only D and E are soldered. To perform this mod, remove the solder blob from D and put a blob over A. I only tried the blobs until I reached the point where all buttons worked unlocked, and the PTT was disabled when locked. I dont know what the other solder jumpers do.