[Kenwood] Fw: TS-850 Audible Whine

[Mark Nace]

Well, it definitely was the fan.  I patched in a 12VDC, 0.29 amp fan I had of 
the same exact size, and it started running right away.  Applied voltage 
measured was 7.1 VDC.  Also, when put into transmit, the voltage went up to 
8.8VDC.  Very interesting.  So, if all is running correctly, the TS-850 fan runs 
all the time.  I do have the manual, and am about to look (the manual is pretty 
crappy by the way...like an archeological dig.....).

73 to all !
Mark
N5KAE

 


----- Original Message ----
> From: GALE STEWARD <k3nd at yahoo.com>
> To: Kenwood Reflector <kenwood at mailman.qth.net>
> Sent: Thu, March 14, 2013 6:06:40 PM
> Subject: [Kenwood] Fw: TS-850 Audible Whine
> 
> 
> 
> FWIW, I modified both of my TS-850S radios to have the fans run continuously. 
>The thermsistor or something in the associated circuitry in one radio failed and 
>the fan did not run at all even when the radio got warm. Not a good situation 
>when contesting!
> 
> I rewired the fan to run off of a 7808 three terminal regulator (8.0V). I don't 
>hardly hear the fan and the radio always stays cool. I liked the mod so much 
>that I also installed it in the radio that didn't have the problem.
> 
> 73, Stew K3ND
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