Milt said: > The > chart in the document was developed specifically for the > Spectrum series > series fed LB antenna. THE MEASUREMENTS IN THE CHART WILL NOT > WORK WITH > SHUNT FED COILS!
So as I guessed, the secret sauce is the type of antenna/loading coil used. It might be a worthwhile experiment to sweep a few off-the-shelf base-loaded 6m and 10m antennas to see what the Z is on the opposing bands to get an idea whether or diplexing them this way would be feasible. I know I have a Larsen 6m I can test, I don't know if that's shunt fed or just series L, never took one apart. I don't think I have anything for 10m though. --- Jeff