I would like to know, if possible, technical specifications of 6300 cooler fan (size, rpm, nominal voltage, etc). I read several previous posts about this argument and, if I am not wrong, there are two small, constant speed fans, and only one in 6300 (two on 6500/6700), with variable speed.
Actually, the problem is not in the noise itself, but in the beat phenomenon it creates probably near to the other two fans. In my station there are no other fan noise sources and my pc is a really small and nearly silent Intel NUC I5.
For new Flex rigs a low noise fan optional could make sense: used in a rack installation, currently installed fans should be fine, but on our desktop shacks, the same fans could be a bit annoying.
First thought was can I perforate the entire top of the case, like the sides, then slow down the fan to inaudible, or delete it altogether.
What's that fan keeping cool anyway? The main A/D chip?
In the mean time I removed the standard big fan and installed a very low noise 80mm Noctua fan as you can see in the picture below.
But this solves only 1/3 of the problem.
The strongest noise came from the two little A/D chip fan covered by the metal shield as you can see in the picture below.
If you remove the cover you will void the warranty, so at the moment I stopped myself.
I am still annoied by the beat of the two small fan and I hope Flex gurus find a solution.
Various suppliers have search tools for fans, e.g. NewEgg, but I don't think you'll find one (at any price) which meets the CFM spec and is quiet. http://tinyurl.com/qz3t837
I have retrofitted quieter fans in power supplies and several VHF/UHF radios. However I either met the original spec, came close to it, or accepted the possible consequences. I would be very hesitant to try that on an expensive radio like the Flex 6000.
Another factor is the 6000-series fan is variable speed. I assume speed control is by PWM (or is it voltage?), so any replacement fan would have to be compatible with this and deliver required airflow at all fan control settings.
A few 80mm fans are thicker than 25mm and can deliver more airflow but there's no room in the 6000-series case for those. The only real solution is larger diameter, slower-turning fans, but there's no room in the current design. FRS cannot offer an extra-cost "quiet fan" option -- there is no available fan that meets the cooling spec and physical space.
They could re-evaluate the technical basis for the current cooling or redesign the internal heatsinks or redesign the chassis for larger fans, but all those are expensive, would require lots of testing, and would have to be prioritized relative to all other work items.
I actually don't find my 6300 that loud relative to the Elecraft KPA500 amp and several computers on my desk.
BTW Google can convert between cubic meters per hour and cubic feet per minute, just use the IN keyword, e.g: "59 cubic meters per hour IN cubic feet per minute"
I always wondered about these chips ever since they come out why not for transistor/finals cooling?
I am not an EE or such so be easy on me. lol.
Hello Doug thanks for your reply, Efficiency would be way down for a radio using more excessive
current using peltier vs heatsink and fan. Ok I get it.
Peltier being used in refrigerators and portable cooler`s was always neat stuff to me.
I was thinking maybe miniaturizations of those chips would someday work in this type application.
I`ll study some more on it. Always nice to learn new things.