[Elecraft] Max power for JT9 with K3S 100?

[Bob McGraw K4TAX]

Running FT-8 or PSK-31, I see 60 C from time to time.   Some bands I see 
the temp rise much faster indicating less efficiency.

73

Bob, K4TAX

On 4/4/2020 5:03 PM, Dave Cole wrote:
> What is the recommended temp to run the KPA500 at?
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 4/4/20 3:01 PM, Andy Durbin wrote:
>> "Does "100% - 10 min, 100 W key-down" mean that if you key down 
>> without stop in CW mode it can go 10 minutes at 100 watts? That seems 
>> like an awful lot."
>>
>> If you want to know what it actually means you'd probably have to run 
>> a test and record the PA temperature.  Does it reach maximum value 
>> within that 10 minute period?  If so, what is that maximum value and 
>> do you want to operate the finals at that temperature?  If 
>> temperature does not reach a maximum then what is the rate of 
>> increase?  At what time does the increasing temperature cross over 
>> the temperature at which you are willing to operate the finals?
>>
>> I record KPA500 temperatures for every transmission. Unfortunately 
>> Kenwood does not provide finals temperature on the serial bus so I 
>> have to make do with recording my TS-590S rear chassis temperature.
>>
>> Kenwood provided data shows TS-590S final temperature limited at 
>> about 85 deg C after 5 minutes and remained constant for remainder of 
>> the 2 hour 100 W key down test.  (and no, I don't let mine get that hot)
>>
>> 73,
>> Andy, k3wyc
>>
>>
>>
>>
>>
>>
>>
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