6600M Fan Speed Questions...
1.What is the RPM of the Slow speed fan? What is the RPM of the Hi
3. What is the CFM of the fan?
So after a few more tests I find that the stock fan maxes out at 1360 RPM’s just a bit short of its maximum of 1500RPM’s. After the PA gets to about 50C the PA temp keeps rising but the fan does not go any faster or provide any more cooling.
I did notice that when the PA heatsink gets up around 90C for an extended time the power
pole connector on the back of the radio gets so hot it almost melts
the plastic even the power cable from the heat blowing out the
vents on the back.
Again Under normal operating conditions this should be fine as most users are not key down for that long.
HI TEMP 1363 RPM's @ 90C
LOW TEMP 986 RPM's @ 23C
I believe there could be a significant improvement in cooling
performance with a better fan. The fan I believe would be a
perfect upgrade is the Noctua NF-A14 Industrial PPC-2000.
This fan is much better than the stock fan and is quite a bit more expensive but is a serious Industrial grade fan.
Here are just some of the specs highlights:
Max speed = 2000 RPM’s (500 more than stock)
Min Speed = 500 RPM’s
Air Flow = 182,5 m3/h (much more CFM’s than stock even at idle)
Static Pressure = 4,18 mm H2O
MTTF = >150,000 Hours (50K hours more than stock)
6 year warranty!!!!
Its only slightly more noisy at Idle than stock however it is quite noticeable at hi speed when the radio PA gets hot under load and goes into Hi Speed mode.
can fully understand why Flex wouldn't install these fans as they are quite
expensive and for most people would be a little over kill but...
Here is a link to Noctua's website:
Clearly the Noctua fan fan works much better than the stock AeroCool as you can see from the picture of the temp and fan RPM’s.
Now at 1356 RPM’s the PA temp only gets to 70C! That’s a HUGE improvement!!!!
Now the BAD...
Because of the way FlexRadio has programmed the fan control firmware when it detects the fan going past 1500RPM’s the radio shuts down even though the PA is much cooler?
So in conclusion the Noctua fan works way better than the stock fan providing significantly more cooling power and actually is quieter than the stock fan at idle but due to the way the fan control software in the radio is programmed it will shut the radio down because of fan RPM’s not over temp.
So in order for this upgrade to truly work FlexRadio would have to update the radio’s firmware to work with the difference in RPM’s of this fan.
So maybe FlexRadio could
offer this as a Cooling Upgrade for hard core users?
Anyway a fun learning experiment! :)
Few points regarding fans:
- Like any other component, we make trade-off decisions about what will work best for the radio. PA temperature is one aspect, but the two large processing elements in the radio also need cooling (FPGA, CPU) and the channels and air venting are designed to keep these devices cool. Their life can be degraded of they are run too hot. I would not recommend altering the airflow in the radio by swapping out a shroud, etc. If you starve the FPGA for airflow, you're going to have a bad time.
- Most of the fans we see are manufactured in China regardless of where they are sourced and there's sometimes a degree of specmanship that might not be entirely above board with anything sourced out of China. In other words, you must test with real operating conditions and you shouldn't trust what you're told in specs without verifying them.
- There are sometimes considerations that go beyond written specs. For example, this fan's speed is modulated by voltage, not by PWM. Running a fan with PWM is like starting a lawn mower in your shack (from an EMI/noise perspective). Instead, we use voltages are are much lower than nominal and you wouldn't necessarily know this unless you did a careful analysis. If you buy a fan that needs 12V to start, it's not going to work in this application. If you buy one that has trouble starting at 8V, you're likely to be routinely disappointed with the radio shutting down because the fan didn't start.
- The individual fans we put on the CPU and FPGA in the earlier FLEX-6000s were being replaced by fans sold here on the community that had bearings that would quickly fail if run in an inverted position (how they are actually mounted). We selected replacement fans that did not have this issue, but many customers purchased fans that were going to fail in a short period of time at the recommendation of others in this forum. We're not likely to go test every replacement fan someone chooses to put in his radio even though it's certainly your right to repair your radio (that we would fight for, incidentally). But, having said this you should be careful to select components that will work in the application.
- We totally get the "pimp my ride" concept and we realize that there are not that many ways to enhance your SDR -- it's not like you're going to get more slices by bolting on a larger FPGA from AutoZone or make it work faster with a bigger Anderson Power Pole. You might could get the better exhaust with a better fan though. So we get it. But be careful to recognize the design requirements before blowing a head gasket or fracturing a cylinder with too much Nitrous.
Hello John, I don’t know about you but 90C or 194F is pretty darn HOT, hot enough to burn your skin off. 100C will boil water!
When I installed the Noctua I saw a HUGE improvement up to about 60C-65C unfortunately since the software in the radio is programmed to shut the radio down at about 1500 RPM’s I could not go any further with the fan at Hi-Speed.
The Noctua Specs and performance makes the stock AeroCool Shark fan look like a toy. Even just holding the two fans in you hands you can feel and see the difference in quality. And the fact that the Noctua has a 6 YEAR WARRANTY says a lot about the fans reliability.
Look at these specs stock fan doesn’t even come close.
for your self even aerocool’s website is cheesy.
STOCK FAN-consumer grade PC fan
FAN-Industrial grade commercial fan.
flex has to do is just raise the fan RPM limit in a future
software update and the Noctua fan will work like a champ and will be
Backward compatible with the stock AeroCool Shark fan!
When you make the Roll-Royce of radios why not put the Rolls-Royce of
fan’s in it or at least make it possible to upgrade it in the
Today is (8/22/2019)
I left my Call,Name, Email & Phone #
"What is the Specific temp that will cause a 6600M to shut down?
What is the final transistor/s used in a 6600M, I could not find that info anywhere?
Would it be possible to raise the RPM limit in a future version of SSDR to accommodate the above fan?
I hope to speak with Steve on the phone soon...