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Re: Analysing Input Impedance Matching Circuit for the NE602

 

For my nanoVNA version H3.2? I measured Returnloss on CH1: -55dB on 1 MHz, and -33dB on 30 MHz.
More than good enough for measurements on those transformers.

Have you ever tried your VNA measurements on receivers sweeping the bands like 160m, 80m, 40m?
You will be amazed how good the termination of CH1 of the nanoVNA is compared to receiver frontends. (there's aboslutely no need to get on the 50 ohm mark precisely, but that's another discussion)

73,

Arie PA3A

Op 19-3-2020 om 02:18 schreef Roger Need via Groups.Io:

On Wed, Mar 18, 2020 at 12:19 PM, Kerr Smith wrote:

I have attached two images to this reply, one shows the S21 gain and the other
the S11 return loss when CH0 is directly connected to CH1.
I calibrated my NanoVNA to the same frequency range as you. Then connected CH0 to CH1. Here are the plots of S21 and S11. My S21 is flat like yours but your S11 does not seem that good. This might be due to the termination impedance on your CH1.
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