One Summer's day in Los Angeles I had a service call on a microwave repeater (vacuum tube). It was located in a warehouse, near the roof. In the heat I lugged my stuff up the stairs. As I set down the service monitor I leaned my other arm against the cabinet. I jerked it away because it was burning my forearm.
I was impressed that the equipment would operate at those temperatures; but I'm sure that the MTBF was reduced. Mike - AA8K n...@no6b.com wrote: > > > > 70 °C, the upper operating temperature limit of many RF devices, is too hot > to touch. However, MTBF will definitely be reduced. In addition, without > better cooling the devices & board will experience greater temperature > extremes, which would result in more failures caused by thermal cycling. >
