[ARC5] The Litte ARC-5 That Could - Sound Good!

[Mike Hanz]

On 1/21/2013 8:53 AM, Christopher Bowne wrote:
> After an hour  of so of pumping 15 watts carrier plus continuous test audio to
> the Bird  dummy load, the transmitter and modulator themselves were not too
> warm,  but the DM-33 dyno was pretty hot, about 165 degrees on the case as  read
> with a infrared surface temp scanner.  What's the typical rated  temp rise limit
> for a continuous duty dyno?

They don't say, Chris.  It was probably pretty hard to find an infrared 
thermometer on the western front in 1945.  What they do is give three 
different output current scenarios to stay under:

Continuous  - 100mA  (the case will roughly be at a temperature that is 
almost but not quite too hot to touch)
1 hour           -  160mA  (presumably with a similar cool-down period)
Intermittent  -  250mA  (30 seconds on and 30 seconds off)

There are associated input voltage and current figures associated with 
these output currents, as well as an output voltage, but they are all a 
function of how much HV current you are drawing from the dyno.

     73,
  - Mike  KC4TOS