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Author Topic: FT-736r 430mhz problem  (Read 573 times)
K7CHS
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Posts: 1




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« on: October 24, 2017, 05:28:13 PM »

Hi everyone, I could use some help with my 736. Problem is with tx pwr 430-449 section. Very little pwr out 430 to 440, zero out at 430 but starts putting out as you go up in freq, and at 440 pwr starts to climb up to around 5 watts maximum @ 449 mhz. The alc is nil (on the radio meter) under 440 mhz, but alc starts coming up as you go up in freq and peaks at a reading of 3 on the radio's meter @ 449 mhz.

Things I have changed:
swapped out the 430 rf board
Installed a new final PA module M57745 unit

All the PS voltages are good to the boards
the 13.79 mhz signal is making it to the RF board
Listening to the output on a receiver in FM mode the signal sounds fine, good audio.
I don't get proper voltage readings or alc meter readings when going through the TX adjustments per the service manual.

Seems like an ALC issue. The service manual is not helping me much. Please help if you can.

K7CNT
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