[CQ-Contest] Switching Power Supplies

[K9MA]

Sounds like the fan of the 1235P-M works the same way as that of the 
1235M, so the resistor mod should work.

73,
Scott K9MA

On 11/13/2024 12:41 PM, Steve Dyer W1SRD via CQ-Contest wrote:
> 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 
>>
>>
>
>
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-- 
Scott  K9MA

k9ma at sdellington.us