UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - 6-gang FM stereo tuner heads

G0HZU_JMR · 18th Jul 2022, 4:01 pm

Here's a 2 port VNA measurement of the real crystal the model is based on. You can see the result is quite similar although the VNA data is a bit noisy.

I'd expect to see the S11 resonance shifted to the left when compared to the frequency of the s21 null and this is because of the distributed capacitance within the crystal leads and its package.

18th Jul 2022, 4:01 pm	#106
G0HZU_JMR Dekatron Join Date: Sep 2010 Location: Cheltenham, Gloucestershire, UK. Posts: 3,077	Re: 6-gang FM stereo tuner heads Here's a 2 port VNA measurement of the real crystal the model is based on. You can see the result is quite similar although the VNA data is a bit noisy. I'd expect to see the S11 resonance shifted to the left when compared to the frequency of the s21 null and this is because of the distributed capacitance within the crystal leads and its package. Attached Thumbnails __________________ Regards, Jeremy G0HZU