Hi Rick,
That is how mine behaves as well, almost exactly like that... However,
I will be running SSTV, and that is hard on the amp... I need to do a
bit more testing prior to that.
As someone else said upthread, half power is really tough on the amp...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 5/3/20 7:52 PM, Rick Bates, NK7I wrote:
I spent 15 minutes active on 20M FT8 this afternoon (some lurking).
At 530 watts output (on the display and utility) into a 1.13:1 antenna
load (SteppIR) for a ten minute calling period (Mongolia then Oman), the
temp rose to 66C; a few moments of elevated fan quickly brought that
down to the low 60's between transmissions.
Ambient room temp 77F. (Both calls succeeded.)
Rick NK7I
North Idaho
On 5/3/2020 7:42 PM, Andy Durbin wrote:
"It is interesting to hear how others experience their KPA500s over
various conditions."
I have over a years's worth of KPA500 data recorded but it takes some
effort to run it through the Excel templates to make pretty plots.
My KPA500 temperatures are strongly influenced by ambient
temperature. Shack temperature is often over 30 deg C in the summer
months and it's not at all unusual for my fan to run at level 3 in FT8
QSO. I think I have only reached fan speed 5 twice and that was while
running temperature tests not while operating. I terminated those
tests at fan speed 5 and didn't wish to push it any higher.
So many people seem to think reducing the output power will keep the
temperature down. It does not. Half power is about the worst heat
dissipation condition for the KPA500.
73,
Andy, k3wyc
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