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Motorola Quantar Power Amplifier Fried
- Thread starter TrevorMollenbeck
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prcguy
Member
I thought the Quantar has protection that sensed temp and fans and defaulted to low power? I can't tell from the pics but if a fan failed I would expect lots of discolored areas from heat build up over time. Do you see any of that? Otherwise it could have been just a catastrophic part failure.
TrevorMollenbeck
Member
All I could see on the inside was those two long black pieces the melted. The reason I was thinking it was the fans not kicking on was when I put a different PA in, I heard the cooling fans kick on after it had transmitted for around 10 minutes. I never heard the fans ever come on on the fried PA no matter how long the conversation was. I could be wrong thinking that is what caused it but I just found it strange I never heard them on it. But after a little bit of transmitting with the new one, they came on for about 5 minutes and then turned off.
prcguy
Member
The basic setup for Quantar amps is a thermal switch turns them on at a specific temperature and that control comes out of the exciter. Later Quantars have the fans running all the time. The mod for that is to remove a tiny choke which cuts the fan turn off signal from the exciter and they run forever. There was a study done many years ago with larger muffin fans and it was found letting them run continuously had more life then turning them on and off during transmit or with thermal switches.
Yes, the PA fans never turning on "...no matter how long the conversation..." is a RED FLAG. Full stop and replace the fans. Additionally, a read on the computer connected to the Quantar should have warned they failed as well, long before it cooked. Replacements parts can be ridiculous in price. It may be better just to purchase another spare Quantar for parts. I forget the order of burnout frequency, but the PA, Power Supply and Exciter can/will go out.
My PA was originally set to have the fans on, but it is pretty loud and the Quantar isn't used enough and is currently in a location where that jet engine fan noise is unfriendly. Some experienced guy on these forums provided insight to have them kick in via thermal control which works for me. Frequent service visits either direct or remote via a PC connected to the Quantar I have found to be helpful.
My PA was originally set to have the fans on, but it is pretty loud and the Quantar isn't used enough and is currently in a location where that jet engine fan noise is unfriendly. Some experienced guy on these forums provided insight to have them kick in via thermal control which works for me. Frequent service visits either direct or remote via a PC connected to the Quantar I have found to be helpful.
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