FWIW ... with one of the KX3 aftermarket heat sinks, and after I
performed the VFO Temperature Compensation routine, I was regularly
doing 10W on the rig with JT65 with its 42 sec Tx cycle. The heatsink
did get warm enough that it worried me, and I added a salvaged 12v fan
from an old desktop
The KX3 specifications in the manual (page 54) say 5 W for digital modes. I
expect the KX2 specs also list a power level.
"Supply voltage of 11 V or higher (on key-down) required for settings above 5 W.
5 W or less recommended for high-duty-cycle modes (FM, AM, DATA). Power will
automatically be
Barry,
You should be able to tolerate 60 degC measured at the PA transistor
tabs for short periods.
You can read the PA temperature in the Alternate VFO B display.
73,
Don W3FPR
On 10/26/2017 9:05 AM, Barry N1EU wrote:
Thanks Tom and Don for the responses. I'll try a few 15sec FT8 xmit cyc
Thanks Tom and Don for the responses. I'll try a few 15sec FT8 xmit cycles
at 50% (7.5W) into a dummy load while monitoring PA temp. Any guidance on
what the upper safe limit is for PA temp?
Thanks & 73,
Barry N1EU
On Thu, Oct 26, 2017 at 8:34 AM, Don Wilhelm wrote:
> Barry,
>
> The normal re
Barry,
The normal recommendation is for 50% of the maximum power.
The KX3 and the KX2 will roll back power for protection if the PA
transistors get too hot.
I know the KX3 rolls back to 5 watts, but I am not sure about the level
for the KX2.
73,
Don W3FPR
On 10/26/2017 7:50 AM, Barry N1EU wr
I use 5-10 watts without any issues. 3-4 bars on the ALC.
73!
Tom - KB2SMS
KX2 #01927
On 10/26/2017 07:50 AM, Barry N1EU wrote:
What is the recommended max power output setting for the KX2 and for the
KX3 for normal FT8 use without after-market heatsink?
Thanks & 73,
Barry N1EU
What is the recommended max power output setting for the KX2 and for the
KX3 for normal FT8 use without after-market heatsink?
Thanks & 73,
Barry N1EU
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