OK, Barry asked me for the resistor value, so I had to look it up.
73,
Scott K9MA
On 11/13/2024 6:41 PM, Barry W2UP wrote:
Tnx! I had a feeling you didn't include the value for a reason :-)
73,
Barry W2UP
On Wed, Nov 13, 2024 at 5:10 PM K9MA <k9ma@sdellington.us> wrote:
I was afraid someone would ask that! According to my 2011 notes,
it was 50 Ohms, and dissipates about 0.5 W. I'd use at least a 2 W
resistor. That runs a K3, K4, or IC-7610 in receive mode without
switching to full speed. (One radio at a time, maybe two.) If you
want to experiment, use the smallest resistance which reduces the
noise to an acceptable level.
73,
Scott K9MA
On 11/13/2024 5:22 PM, Barry W2UP wrote:
Scott,
What value resistor?
Tnx,
Barry W2UP
On Wed, Nov 13, 2024 at 4:17 PM K9MA <k9ma@sdellington.us> wrote:
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
>>
>>
>
--
Scott K9MA
k9ma@sdellington.us
--
Scott K9MA
k9ma@sdellington.us
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|