On Tue, Feb 27, 2024 at 08:20 AM, @Ludwig_DH8WN wrote:
Please be aware of the different stray capacitance and the capacity of the connected QDX circuits. And use a rf suitable board!!!
My final result of my whole testing was: Following the manual brings good results or at least a good start point to tweak the filters.
Thank you for your thoughts and clarifications!
The more I play in Elsie with LPF simulations, the more I agree that following the manual will be a good start. It seems in the QDX HB, the 15/17m LPF is the most sensitive to the inductance values. The others are more...robust. Especially as far as reflected power to the PA. And there are more downsides to using less turns on the 15/17 than the recommended number of turns, even if inductance is higher than spec'd/calculated. So I will follow the manual pretty closely, maybe doing 20T instead of 21 on L2, but that's the only change.?
-Nate?
N8BTR
