[Amps] Heat Measurement in Amps

[Gary Smith]

Look in tower hobbies online catalog for infrared temp gauge or clik this link.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXEMG5&P=ML


Yeah, I fly r/c aiplanes and helis too.  Another  fun and someitmes pricey hobby.

73,
Gary...wa6fgi


  ----- Original Message ----- 
  From: Roger 
  To: amps at contesting.com 
  Sent: Friday, June 11, 2010 8:40 PM
  Subject: Re: [Amps] Heat Measurement in Amps




  On 6/11/2010 6:39 PM, Bill, W6WRT wrote:
  > ORIGINAL MESSAGE:
  >
  > On Thu, 10 Jun 2010 11:07:37 -0700, Patrick Barthelow
  > <apolloeme at live.com>  wrote:
  >
  >    
  >> Has anyone found a decent cheap temperature sensor/guage  (perhaps even at harbor freight, etc) that you could place at a specified location in the exhaust airstream of the tubes, of various amps to see and record what is "normal" temp ranges?  Maybe the brain trust here, could search out a standard, cheap temp measurement sensor  (some DVMs have them) and do some testing and publishing of expected exhaust air temps of various amps in various modes, like Low duty cycle (SSB), medium (CW) or high (RTTY)
  >>      
  Back in another life and time when I was working in industrial 
  Instrumentation and some high powered RF *stuff*, we used some rather 
  inexpensive "thermostatic switches". These were shaped similar to a TO-3 
  case and operated at a fixed temp. They would either open of close and 
  you would purchase them to operate at the desired temp. There is a more 
  expensive version that is adjustable.   I don't remember who made them, 
  but I think I might have one or two off some old surplus equipment.  
  I'll try to remember to look for them next time I'm out in the shop, but 
  I have 5 power supplies for external HDs I have to find.  My Emtron amp 
  senses temp and switches the fan speed if the exhaust air gets too hot.

  73

  Roger (K8RI)
  > REPLY:
  >
  > For low cost, it would be hard to beat a cook's meat thermometer,
  > available at any grocery store. I have one sitting on top of my amp as
  > I speak. It has a long probe, so I simply drilled a hole through a
  > small piece of wood and poked the probe through, leaving it sticking
  > out about two inches. In normal RTTY operation it rarely reads over
  > about 150 degrees F. Being non-electronic, they are immune to RF.
  > Works great.
  >
  > A related idea, which I never got around to implementing, is to
  > install a small thermal switch connected to an alarm of some kind.
  > These are cheap and available in a wide range of temperatures. Also
  > non-electronic. Pretty sure Mc-Master Carr carries them.
  >
  > 73, Bill W6WRT
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