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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