Piggie

I need to update the post. Turns out not all UVSJs or HLSJs are power passive on their lower frequency side. But the Hollands and the Pico Macom are both power passive on the low side. Also turns out they are about the best ones you can buy, at least for the money.

So compared to your or who ever's drawing EV pointed out the difference. With the proper UVSJ you don't need a separate wire to feed the amp if it's only on the VHF side. The power will go up the coax, be it DC or low voltage 60Hz AC.

But note, this will not work the other way. The UHF side is blocked for all frequencies including DC for all frequencies below 470 MHz. I know of no UVSJ that is power passive on the UHF side due to the way they are built.

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The more I understand, the less I know.