Re: U8 test
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When RX_BPF is LOW/FALSE/0, S21 between J23 and J18 (assuming receive is bridged to transmit in the TR switch) should be low, meaning less than -45 dB. That's what is shown in the plot on the right. When U8 was blown S21 was actually between -3 and -8 dB.
On Monday, April 14th, 2025 at 3:28 PM, jerry-KF6VB <jerry@...> wrote: On 2025-04-13 14:45, Oliver KI3P via groups.io wrote:Hi Jerry,*** So - you did this measurement with RX_BPF_SEL = False, right? |