On 6/11/2010 6:39 PM, Bill, W6WRT wrote:
> ORIGINAL MESSAGE:
>
> On Thu, 10 Jun 2010 11:07:37 -0700, Patrick Barthelow
> <apolloeme@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
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|