K3 temperatures?

[k5oai]

What temp readings are others seeing for front panel and PA?

FP = 41C
PA = 36C

--

GB & 73
K5OAI
Sam Morgan
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Ken Wagner K3IU]

In extended Rx... ambient temp 55-60F
FP=32C
PA=24C

73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 11/13/2013 10:46 AM, Sam Morgan wrote:
> What temp readings are others seeing for front panel and PA?
>
> FP = 41C
> PA = 36C
>

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

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[k5oai]

more info
wondering if the 41C was why I ask,
rig has been on for last 36hr
I placed my hand on the top and found it very warm to the touch

I do have the dual rx but no xverter
dual rx was on for last 4 hrs
current drain says 1.48 - 1.59 A
room temp 27.7 F

On 11/13/2013 9:46 AM, Sam Morgan wrote:
> What temp readings are others seeing for front panel and PA?
>
> FP = 41C
> PA = 36C
>

--

GB & 73
K5OAI
Sam Morgan
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Paul Kirley]

Sam K5OAI sed:

>  room temp 27.7 F

Unless the room is in an igloo, he probably meant 27.7C = 82F.  

Good temperature benchmarks to keep in mind are:
(a) 20C = 68F is "normal" room temperature; and
(b) 37C = 98.6F is "normal" body temperature.

Naturally, the K3 temperatures will be higher than the ambient
temperature, as the K3 dissipates part of the energy coming into it
from the PS.  

The K3's PA fans are designed to run unless the PA temperature is 36C
or less, so the PA temperature will tend toward 36C unless the room is
cool.  In a warm room, 36C is a pretty normal PA temperature reading.

In a warm room there *may* be nothing wrong with an FP temperature of
41C after much idling.  With a receive current drain of 1.5A, the K3 is
dissipating 20W continuously.  Of course, the PA fans don't directly
cool the front panel.

Have the Front Panel Temperature Sensor and PA Temperature Sensor
calibrations been performed as detailed in the K3 Owner's Manual?

73,
Paul W8TM

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

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[k5oai]

bingo op error  :-/  (why am I not surprised?)

room temp was 27.7 *C* not *F*
although it had actually been 20F outside earlier that morning

Also, thanks for the calibration tip for the PA & FP temps
I found they were both many degrees higher than actual room temp
sm

On 11/14/2013 10:56 AM, Paul Kirley wrote:

> Sam K5OAI sed:
>
>>   room temp 27.7 F
>
> Unless the room is in an igloo, he probably meant 27.7C = 82F.
>
> Good temperature benchmarks to keep in mind are:
> (a) 20C = 68F is "normal" room temperature; and
> (b) 37C = 98.6F is "normal" body temperature.
>
> Naturally, the K3 temperatures will be higher than the ambient
> temperature, as the K3 dissipates part of the energy coming into it
> from the PS.
>
> The K3's PA fans are designed to run unless the PA temperature is 36C
> or less, so the PA temperature will tend toward 36C unless the room is
> cool.  In a warm room, 36C is a pretty normal PA temperature reading.
>
> In a warm room there *may* be nothing wrong with an FP temperature of
> 41C after much idling.  With a receive current drain of 1.5A, the K3 is
> dissipating 20W continuously.  Of course, the PA fans don't directly
> cool the front panel.
>
> Have the Front Panel Temperature Sensor and PA Temperature Sensor
> calibrations been performed as detailed in the K3 Owner's Manual?
>
> 73,
> Paul W8TM
>
>

--

GB & 73
K5OAI
Sam Morgan
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[k5oai]

fyi .. after calibration
room temp = 80F
RX (dual) current drain 1.4-1.5A
PA temp = 91.4F  (no tx for last 2 hrs)
FP temp = 100F  (rx with dual rx for last 4 hrs)

On 11/14/2013 12:24 PM, Sam Morgan wrote:

> bingo op error  :-/  (why am I not surprised?)
>
> room temp was 27.7 *C* not *F*
> although it had actually been 20F outside earlier that morning
>
> Also, thanks for the calibration tip for the PA & FP temps
> I found they were both many degrees higher than actual room temp
> sm
>
> On 11/14/2013 10:56 AM, Paul Kirley wrote:

snip

>> In a warm room there *may* be nothing wrong with an FP temperature of
>> 41C after much idling.  With a receive current drain of 1.5A, the K3 is
>> dissipating 20W continuously.  Of course, the PA fans don't directly
>> cool the front panel.
>>
>> Have the Front Panel Temperature Sensor and PA Temperature Sensor
>> calibrations been performed as detailed in the K3 Owner's Manual?
>>
>> 73,
>> Paul W8TM

--

GB & 73
K5OAI
Sam Morgan
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html