[Elecraft] KPA1500 Power Supply Fan Noise

[N4ZR]

And my SN 502 is perfectly acceptable, even with the stock fan-ware (is 
that a word?)

73, Pete N4ZR
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On 6/11/2019 9:22 AM, Dan Atchison via Elecraft wrote:
> My KPA1500 s/n 156 had such a problem with PS audible noise.?? It was 
> fixed with two mods available from Elecraft, one a new LED board and 
> another with a resistor addition to the MeanWell power supply output?? 
> The latter was probably not associated with noise but it's an addition 
> that was not on my #156.
>
> 73,
> Dan -- N3ND
>
> On 6/11/2019 7:51 AM, Roy Koeppe wrote:
>> Eric -- this is not at all normal! My PSU is quiet...hardly hear it 
>> from under the table. I understand Elecraft changed to much quieter 
>> fans maybe two years ago. But even so, perhaps the voltage to your 
>> fans has soared way to high? I haven't looked at the circuit driving 
>> them. Maybe lost regulation, etc.
>>
>> 73,???? Roy?????? K6XK
>>
>>
>> Apparently I was not clear enough in my message.?? It is the PSU fan 
>> noise
>> that is deafening, not the RF deck.?? Like Peter, my PSU sits on the 
>> floor
>> underneath a wooden operating desk that holds the rest of the 
>> K-line.?? The
>> noise from the PSU is high-pitched and piercing.?? The only thing I can
>> liken it to is a four-rotor Mazda prototype IMSA GTP race car from the
>> early 90s.?? Brain-piercing, tear-your-hair-out, heard-from-every
>> room-in-the-house louder than hell, and has been so since the day it
>> darkened my doorway--with the RF deck at idle.
>>
>> 73 Eric WD6DBM
>>
>>
>>
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