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Yes, I agree with analyzing with oscilloscope. I was hoping to make this simple with the aid of a data sheet but, as usual, things I do are rarely ever simple. Thanks.73, Mike, KC0TA
I'm wondering about the compatibility of the HM9170 and the HT9170D. The HM9170 is a 20-pin chip while the HT9170D is an 18-pin chip. I just can't find any data on the HM9170 to verify the pinouts of the device. The KT-8900D has a 2-tone and 5-tone decoder function which may explain the different chip (HM9170 with 20 pins) in my radio. It would certainly help if I could locate a schematic of the radio and/or data sheet for the HM9170 chip. Any ideas on getting a radio schematic?73, KC0TA
I have a newer model (KT-8900D) which has a 20-pin chip, HM9170. Pin-1 is opposite of your picture and there are some similar features of the main board and the front face board. I have not been able to find information on this IC to implement this mod on the newer model radio. Any help out there? Thanks.I also have a KT-7900D that might require this mod, also.