Kenwood Sirius receiver - hot! Yikes! - AVS Forum
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post #1 of 10 Old 07-28-2003, 07:47 PM - Thread Starter
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I've had the Kenwood Home2Anywhere Sirius receiver for a few days now.

Man, does this thing get HOT on top!

Any idea why it dissapates this much heat? Does everybody's Sirius receiver get this hot?

-Jon

-Y
"First things first, but not necessarily in that order." - Dr. Who
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post #2 of 10 Old 07-28-2003, 11:03 PM
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If it's in the sun, it will be very hot to your skin, since the top of it is thin-metal.. It's actually not that hot at all if its in a regular temp evironment (80 degrees or so), it's about 60 celcius. Which isn't that hot, considering it doesn't have a fan. XM's SKYFi runs just as hot, except they use enclosed plastic casing on it... So the heat is not felt by holding your hand around it.

The AudioVox SRS uses plastic casing too, so it doesn't FEEL as hot.

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post #3 of 10 Old 07-29-2003, 04:29 AM - Thread Starter
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I see what you mean about the plastic case on the SkyFi unit. My unit, however, is not in the sun at all - it's in an air conditioned room near my TV.

60C is about 140F, right? 140F is HOT. That's a lot of current being dissapated. Is this thing secretly crunching numbers or something? The old "Chinese Lottery" approach to cryptography?

-Jon

-Y
"First things first, but not necessarily in that order." - Dr. Who
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post #4 of 10 Old 08-26-2003, 02:25 PM
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I work for a retailer who sells Sirius, and we have one of these units activated and on display in our air-conditioned show room.

This unit gets ridiculously HOT...

No Idea Why.

It Was Like That When I Got Here...
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post #5 of 10 Old 08-26-2003, 02:28 PM - Thread Starter
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I'm convinced that Sirius is broadcasting info which these boxes chew on. Distributed cryptography. Government top secret tasks. Siriusly :D

Honestly - these things are way too hot for a piece of modern electronics.

-Jon

-Y
"First things first, but not necessarily in that order." - Dr. Who
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post #6 of 10 Old 08-27-2003, 03:12 PM
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It's either have it run a little hot, or deal with all the complaints from users about a fan in it. Every complained about the Sony XM receiver's fan.

You really want it to be cooler, install a small fan. There is a place for it in the case design, at the bottom. It was removed from production due to concerns about noise.

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post #7 of 10 Old 08-27-2003, 03:16 PM - Thread Starter
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I just can't see why it actually generates that much heat. What is it doing which causes that much heat dissipation? It's not amplifying a signal to power levels. Is it simply the decoding process?

It reminds me of VAXen. Great machines, doubled as a space heaters in the winter.

-Jon

-Y
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post #8 of 10 Old 08-29-2003, 02:22 PM
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Yes, it is tuning, amplifying, filtering, demuxing the data, decoding text and audio, and converting the audio to analog for output.

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post #9 of 10 Old 08-29-2003, 02:28 PM
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This is the first generation Sirius chipset. It does not include any chips from the manufacturer for the radio, but it will illustrate most of the processing that goes on.

http://members.aol.com/buggyboyvt/figure2.gif

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post #10 of 10 Old 09-08-2003, 03:16 PM - Thread Starter
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Interresting - thanks for the info. But I still can't see why it generates so much heat. I don't want to beat a dead dog, though...

-Jon

-Y
"First things first, but not necessarily in that order." - Dr. Who
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