On 3/18/2019 2:38 PM, Tom Georgens wrote:
Admittedly 1.15:1 is not world class, and could be better, but I don't consider
it unacceptable and I plan on using the switches I bought. Are we drawing
different conclusions from the same data?
Hi Tom,
Yes, we are. I was using a pair of them to switch inputs and outputs of
a KPA500 an Ten Tec Titan. I use the KPA mostly on 6M, and what you saw
on 10M was significantly worse there.
Another important point. It is totally unrealistic to terminate un-used
ports for isolation measurements, because un-used ports are often not
matched at the frequency where isolation is of concern. I measure
isolation between ports with a VNA (the DG8SAQ VNWA3e). In the case of
this unit, I would measure between the two outputs.
73, Jim
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