15 novembre 2023

Yaesu FT-857 Repair: Tackling a Sense Wire Issue


 The image above is Yaesu’s promotion image the FT-857D. It is essentially a larger version of the FT-817ND. 100 watts on HF, 50 watts on VHF and 20 watts on UHF. It is a good all-rounder radio. I have not met anyone who had used mine (or owns one) that was not impressed with it in it’s time. My only fault is that the internal speaker is a little too tinny, but carrying an external speaker (I have a small Nokia speaker).

Sense Wire Failure

About a month or two after owning the radio (I bought it second hand), it developed a fault. No matter what I did, I could not get more than 20 watts out of the radio. After some hunting about, I emailed Yaesu technical support who informed me that it was probably the battery sensing wire. You can see the battery sense symbol next to the voltage on the top right of the main screen. This symbol is in contrast to the usual ‘V’ displayed (see the image above).

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