Re: NanoVNA Under The Covers
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Yes I just use the 3 point calibration from the dummies provided. The 50 ohm load did show -70dB. I then use another sma dummy load I had and it show -40 dB or so. I am not saying I believe my results, that is why ai want to buy a few better ones to counter check. I do have a RL bridge that is good to -60dB up to 500 MHz at least. You can measure down to -78dB if you have an AD8307 power meter which I have. That chip can go down to -90dB in principle.Sent from my Samsung Galaxy smartphone.
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-------- Original message --------From: jimcking@... Date: 04/08/2019 19:16 (GMT+01:00) To: [email protected] Subject: Re: [nanovna-users] NanoVNA Under The Covers [Edited Message Follows]I read -70 dB also on two different NanoVnas.? Ch0 LogMag @ 50 KHz using the 50 Ohm load that came with the NanoVna.? This is the same 50 Ohm that was used in the calibration.? The calibration procedure assumes the load to be perfect so return loss shows -70 dB.? It goes up with Frequency but is always better than -50 dB.Jim K.
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