KPA1500 Fan Noise Video posted

Nice video Don. Speed 4 and 5 might be like trying to operate with the XYL
vacuuming around you. I wonder what duty cycle and power level it takes
for these speeds to kick in. It was good to see a comparison with the tube
amps. My Alphas were hardly noticeable when running but remember they are
significantly larger and do not require a 3, 4 or 5 fan speed setting.

John KK9A


Don Butler n5lz wrote:

In response to N5ZC’s request  I just made this short video to provide a
listen to the KPA1500's fans ... at least as they sound in my shack.
Follow this link to view: https://vimeo.com/273064144

In addition to the KPA1500 the video also includes footage of my Alpha
9500 and Icom PA1 … each running with their fans at maximum speed … to
provide a simple rather crude comparison.

What do I think?   I think that fan speed 1 and fan speed 2 on the KPA1500
are probably comparable to the fans that are installed on the other
amplifiers as far as sound and efficiency are concerned and likely provide
a similar degree of cooling at those speeds.   And, I think that fan
speeds 3, 4, and 5 (which are indeed noisy) provide the KPA1500 with
enhanced cooling capability that is simply not available on other
amplifiers.

Don, N5LZ

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 So far for the short time I've had the 1500, I've used it very heavily in WPX CW recently.  At constant running , sometimes getting no answers which is probably max duty cyclefor this kind of operating, I never went over about 74 degrees C which kicks in fan speed 3 (I think, hi, I had it manually on 3 anyway in this situation and of course 1500 watts).

BillK3WJV

    On Saturday, June 2, 2018, 6:47:03 AM EDT, [hidden email] <[hidden email]> wrote:  
 
 Nice video Don. Speed 4 and 5 might be like trying to operate with the XYL
vacuuming around you. I wonder what duty cycle and power level it takes
for these speeds to kick in. It was good to see a comparison with the tube
amps. My Alphas were hardly noticeable when running but remember they are
significantly larger and do not require a 3, 4 or 5 fan speed setting.

John KK9A


Don Butler n5lz wrote:

In response to N5ZC’s request  I just made this short video to provide a
listen to the KPA1500's fans ... at least as they sound in my shack.
Follow this link to view: https://vimeo.com/273064144

In addition to the KPA1500 the video also includes footage of my Alpha
9500 and Icom PA1 … each running with their fans at maximum speed … to
provide a simple rather crude comparison.

What do I think?  I think that fan speed 1 and fan speed 2 on the KPA1500
are probably comparable to the fans that are installed on the other
amplifiers as far as sound and efficiency are concerned and likely provide
a similar degree of cooling at those speeds.  And, I think that fan
speeds 3, 4, and 5 (which are indeed noisy) provide the KPA1500 with
enhanced cooling capability that is simply not available on other
amplifiers.

Don, N5LZ

______________________________________________________________
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Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]  
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Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
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