I have been looking at the service manual for the FT-857D and I may see a potential problem. I am not at home now, so I can't check things out. But on page 8 of the service manual, under the PA Unit block diagram, there is a little section labeled "Q3006, etc. 2SB1134 2SA812 2SC4154 ANT DRIVE" with an input labeled ANCV and an output labeled ANNG. The circuitry for this shows up on the schematic on page 55 close to the left side of the page, a little above the center. WHAT exactly does this part of the circuit do?
73, Zack W9SZ
On Sat, Jul 16, 2022 at 6:57 PM Zack Widup <w9sz.zack@...> wrote:
I went to my favorite hilltop in EN50rl for CQWW VHF,
managed to get the 6 and 2 meter Yagi antennas set up in the hot sun (the 6 meter Yagi is BIG),
hooked everything up and it seemed to be doing fine. Antennas were
working and SWR was good. I called several people over about a half an
hour on 6 meters with my FT857D. None of them seemed to hear me. I was
only running 10 watts as a QRP Portable Hilltopper. Then I saw smoke
come out of the rig and then no power came out. It still received OK. I
checked both 50 and 144 MHz and had no power output on either band. So I
took everything down and went home (a 45 minute drive).
The
rig did quite well up till now. I used it in the June VHF contest. I
don't feel like digging into it right now to see what went bad. I'm sure
I can repair it if I can get the parts.
I only had today from about 1 to 6 pm CDT to participate. I can't be on tomorrow. But I'm sad that I didn't make even one QSO.
