[TowerTalk] Looking for a HP 80/40 Duplexer

[Jim Brown]

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