[CQ-Contest] Switching Power Supplies

[Steve Dyer W1SRD]

It's not variable speed, but on demand. When it turns on it's full on.
Must be something about the pitch of that sized fan that annoys me. 
Maybe all the years working on 1U server farms at data centers.
73,
Steve
W1SRD


On 11/13/2024 9:47 AM, K9MA wrote:
> I did a very simple mod to 1235M:  A resistor in parallel with the 
> thermostat. This causes the fan to run continuously at low speed, 
> rather than cycling when demand is low. The fan runs at full speed 
> only during times when I'm transmitting a lot, when the fans in the 
> radio and amplifier drown it out.
>
> The 1235P-M may be different, but I doubt it has a variable speed fan, 
> or this mod wouldn't be necessary.
>
> 73,
>
> Scott K9MA
>
>
>
> On 11/12/2024 8:00 PM, Steve Dyer W1SRD via CQ-Contest wrote:
>> My only gripe with the 1235P-M is the fan noise. Good PS otherwise.
>> 73,
>> Steve 
>
>