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Re: sBitx antenna-first warning

 

I'd like to clarify :
I have recommended a resistive swr bridge, not just three 470 ohms resistors.
You will actually need 30 of them. Paralleling ten will produce a combined resistance of 47 ohms. Three such 47 ohm bundles will be used to make a resistive bridge.
I will probably build one to show how it must be done.
- f

On Fri, Aug 5, 2022, 3:58 PM Scott KE8KYP <scott_massey@...> wrote:
Hi David,

Thanks for the notes.? I own and have used a 50 ohm dummy load for years.? I was referring to Ashhar¡¯s comment that the three parallel 470¡¯s are to be connected to a SWR bridge.? I too thought he was talking about a dummy load but he was talking about a SWR bridge circuit that uses three resistors.? Sizing the resistors large enough help protect the PA finals during tuning operations.

There is always something to learn.

Cheers, Scott

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