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[aprssig] D700 in cold weather?

Gary n6lrv at cox.net
Mon Dec 25 04:24:09 UTC 2006


Hmmm... according to my info from Kenwood there is no temperature control
system in the D700 instead (and like many kenwood mobiles) the fan is
designed to turn on when the radio is keyed and turn off after a
predetermined time has passed (probably a FET or 555 timer or similar
controlling this). A better idea would have been to position the fan to
actually cool what gets hot instead of blowing into a flat surface but
then Kenwood has done that with many radios. Unless your radio's fan
actually says 'ball bearings' on it then it probably has bushings and
they get noisy pretty quick. I haven't seen a Kenwood mobile yet come
equipped with a fan that has ball bearings but I haven't seen everything
yet.
73,
Gary

Joel Maslak wrote:

> Does anyone have D700 in cold weather experiences?
>
> Is it normal for the fan to run in extreme cold (it seems to not run
> very much, or at least not loud enough for me to hear, when warm).
> My current theory is that the temperature control system thinks a
> "too cold" measurement means "sensor failed" or some such and turns
> up the fan all the way.  It's certainly not transmitting enough to
> get warm.
>
> The other possibility is that I have bearings going out in the fan,
> and that's why it's a bit louder.  So I'm curious about people's
> experience with it in cold weather.  I'm getting really tempted to
> disconnect the fan, as it's not good for it to run in the extreme
> cold either way (my usual rule for electronics that go in the car is
> "no moving parts" because of the temperature extremes - obviously the
> D700 fails that test, and I broke my rule - that'll teach me!  A big
> heat sink would have been a much better idea, like even the cheap
> Alincos do).
>
> (for reference, "cold" is -5F and colder)
>
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