On 11/17/2025 2:54 PM, Randy Farmer wrote:
I'm investigating upgrading my station from its present 500W capability
to 1500W.
Hi Randy,
Some thoughts on this. The response of all passive networks depends on
the complex source and load impedances they see at the operating
frequencies, and they can vary over a very wide range on 80M, less so on
40M. These factors affect both dissipation and isolation. I'd carefully
study the ratings for the units you're considering, and the range of
mismatch for which they are specified.
I do know that the team of highly qualified engineers that maintain
N6RO are happy with their VA6AM bandpass filters. I'm pretty certain
they're not using any duplexers.
73, Jim K9YC
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