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I'm going to be modifying a QDX-M that was "factory" built for 10m to be used on 6m. I plan to use QMX+ values for BPF and LPF. But I believe the existing T1 transformer is a 43 mix Binoc, and I know the QMX+ and most high band QDXs now use 61 mix.?

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Thoughts on the mix for 6m? Should I leave the 43 as installed, or will I need 61 to get decent power and /or efficiency on 6m??

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I know a few have built QDX-Ms for 6m, but some have left out which mix binoc they used. I also see some posts about simulations done, but the associated pictures are long gone. Any data or thoughts are appreciated?

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-Nate

N8BTR?

Would you elaborate as to what kit T1 is in and its real designation?

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Can't find T1 in the QMX as they are all 3 digit numbers.

as in T401, T501 and T507?

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Allison
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Hi Allison,??

I'm referring to T1 in a QDX-M, the PA output transformer, which can be a BN43-202 or a BN61-202.?

I have a QDX-M already built for 10m that I'm going to convert to 6m. If the existing T1 is a 43 mix, do I need to change it to a 61 mix for 6m?

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I hope my question is more clear!?

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-Nate

N8BTR

On Fri, May 30, 2025 at 03:28 PM, Hans Summers wrote:

It will work with -43 material. But I'd expect you to get a bit higher power output and higher efficiency with -61 material. Don't ask me how much is "a bit"...

Thanks Hans! I will try it as is, and if the power output is lower than I need, I'll then try swapping the material. Either way, I'll report my results here.

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-Nate

N8BTR