Is the internal autotuner of the TS590S on?
- Jerry
On 2023-11-21 04:50, Andy Durbin wrote:
Thanks to those that replied with suggestions.
This morning I ran some additional testing. I found I could induce
the oscillation at 70 W KPA500 output power. With KPA500 switched to
STBY I could run 100 W from my TS-590S with no anomalies. The only
change in the antenna system configuration is that KPA500 is in STBY
not OPER.
The time for onset of oscillation , and the frequency of oscillation,
both depend on the power level. The higher the power the quicker the
onset and the higher the frequency. To me that suggests a thermal
problem rather than voltage induced breakdown.
The only ferrite in the 40 m antenna system is in the KPA500 LPF and
the KAT500 tuning inductors. The KAT500 inductor configuration was
the same for 100 W STBY and 70 W OPER test. Those two facts would,
if taken in isolation, suggest a problem in the KPA500 40 m LPF.
However, the LPF seems happy at 500 W with the dummy load.
I'm finding it hard to find a failure mode that fits all the test data.
73,
Andy, k3wyc
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