[amsat-bb] Re: FT-847 Disaster
ollie at earthrobot.com
Mon Dec 24 16:23:24 PST 2007
Thanks to the PolySat team at CalPoly, nice scans of the FT-847 manual
and schematics are here:
> Don't feel bad,,
> I had a Kenwood TS-700.
> every lightning storm I'd unplug it from everything.
> It had a built in 110VAC supply. But the 4 connector plug was also the
> same plug you used for the 12VDC input,, just different pins.
> I must have a thousand times pulled this connector before a storm, and
> re attach it afterwards when I wanted to use the rig,
> somehow one day 110VAC went into the 12VDC pins, needless to say the
> rig did NOT like this even with the rig being off.
> LOTS of smoke and missing parts on boards after this happened.
> But it was a great rig,
> It with NO preamp, but 4 eight elemet yagis i was able with a 40
> watt amp I actually worked 22 stations off the moon. and that was LONG
> before any of this new fangled software recieving stuff, it was
> strictly with headphones and by ear. way cool,, wouldn't mind having
> another one.
> Joe WB9SBD
> Jim Jerzycke wrote:
>> IIRC, the 847 has a "protection" diode across the DC
>> input. Connecting the DC backwards will blow the fuse,
>> and probably short the diode.
>> You can download the service manual from the mods.dk
>> 73, Jim KQ6EA
>> --- k7zt at suddenlink.net wrote:
>>> Hi All:
>>> I'm afraid that I reversed the DC Polarity to my
>>> FT-847. Needless to say, "the smoked leaked out",
>>> therefore, the 847 has ceased to operate.
>>> I understand that the 847 has protection for
>>> careless hams like myself.. I was hopping that
>>> someone on the board has had this experience (no
>>> need to reveal). Or if someone could let me know
>>> what may need to be replaced to get my radio back in
>>> working order.
>>> Many Thanks,
>>> - Joe Westbrook, K7ZT
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>>> those of the author.
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