Current would be the main thing to watch. 100 mA sounds right if you've got a GPS receiver connected. 12A isn't right, though - maybe 1.2A?
I've got a piece of thermochromic film I'll sometimes lay across the back of a board if I think it's generating too much heat - this is the $5 alternative to a $15,000 thermal imaging system. Usually it'll show you a big blob of heat radiating from the voltage regulator. Scott Keith VE7GDH wrote: > > > Scott - I have a T2-301 connected to your T2-301 Serial & Power > cable with your serial splitter cable connected to it. I have a Nuvi > 350 connected to port A (red) and a non-display GPS receiver > connected on port B (blue). All appears to be working OK, but > the T2-301 is warm to touch. The T2-301 was transmitting > every 60 seconds while testing, but should be transmitting every > 10 minutes now. I just popped the lid and felt all of the major > components. The back of the T2 board and the large shielded > enclosures were all mildly warm. None were hot. The ambient > temperature was about 22C. I just measured the current with a > GPS receiver connected. It was about 100 mA, but briefly > pulsed to about 12A while it was transmitting. The GPS alone > is probably drawing close to 100 mA, so I don't understand > why the case feels warm to touch. I would expect the T2-301 > to be not much more than ambient temperature. Do you think > there is anything unusual going on? > > I'm probably worried about nothing. The radio was powered > by a 13.8 source while I was testing. It was easier for me to > measure the current by changing over to a battery. The voltage > was about 12.9V and the T2-301 was noticeably cooler to > touch. Still, any comments? > > 73 es cul - Keith VE7GDH > -- > "I may be lost, but I know exactly where I am!" > >
