[Elecraft] K3 HI-TEMP ALARM

[Guy Olinger K2AV]

In my experience with this, the five watt calibration of the K3 was
incorrect. The gain required to set the fifty watt cal was then
incorrect.  This can cause various problems, including burning out the
low power amp, and not getting 100 watts out when 50 is calibrated.

Note that a Bird wattmeter with a 250 watt slug is NOT sufficiently
accurate at 5 watt levels.

On Mon, Jan 11, 2010 at 10:20 PM,  <je1trv at a1club.net> wrote:
> Hi folks!
> Thank you for suggestions.
>
> In my previous post, I forgot to say that my K3 works without hi-temp
> alarm after warming up (about 30min or so without transmit just receiving
> status).
>
> So, it's just the same with Jaako's case.
> My shack temp was around 15C these days.
>
> hmmm...
>
> Atsu, JE1TRV
>
>> Hi
>>
>> I have same problem, when shack temperature is below 17 degrees Celcius
>>
>> When PA Temp is higher than 25 degrees C then power is OK.
>>
>> Jaakko OH1MA / K3 ser. 2952
>>
>>
>> Hi Elecrafters!
>>
>> I have problem on my K3/100 (S/N3050, factory assembled).
>> When I transmit more than 12W(means hi power amp on)
>>   within about 30min after mains power on, HI-TEMP alarm
>> occur and equipment is forced to set 5W.
>>
>> No problem at all when hi-power amp is through ( Po<12W ).
>>
>> Any idea?
>> Thanks in advance
>> 73, Atsu JE1TRV
>>
>>
>
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