The datasheet from Diodes, Inc.? for Zeners in the family that includes the 47V 1W Zener 1N4756A shows capacitance information. The capacitance may be big enough to detune the 10m and 6m LPFs.
On Thu, Jun 6, 2024, 11:10?AM Chris KB1NLW via <chrisrey1=[email protected]> wrote:
What do I know?
I have had to replace BS170's in QDX and QMX four times before adding Zeners..
I was using an auto tuner before I realized they have big SWR spikes - possible cause of failure
I also found an intermittent in a coax cable? - possible cause of failure
No failures since I put the Zeners in - not proof they work, could be coincidence
Even a fast voltage breakdown of BS170 will probably cause permanent damage.
I am concerned that the Zener's capacitance may be detrimental during 6m operation.? I have been unable to find the Zener's capacitance, I may just see how the QMX+ works with and without Zeners
