Thank you for the reply. I'll do that. It was pulling 2.3A at 24V.
On Sat, 29 Mar 2025, 15:21 Steve Thompson via Amps, <amps@contesting.com>
wrote:
> When you're simulating circuits at these frequencies you need to include
> the parasitic inductance of the capacitors as it can have a significant
> effect - for the typical ATC100B type it's around 0.5nH, probably
> several times that for a trimmer cap depending on the type.
>
> To check or adjust matching with transistor amps using a VNA the usual
> method is to put 50ohm terminations on the in/out and measure the
> impedance at the transistor end. At UHF and above it can be tricky as
> you're probably working at <10ohms impedance and positioning probes to
> avoid stray inductance needs a lot of care, fractions of a mm matter.
>
> You mentioned the 20W power you were getting out of your amp. It's very
> helpful to also give the voltage/current as that gives useful
> information about how the amp is working.
>
> 73, Steve G8GSQ
>
>
>
>
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