I updated my -H4 with Dislord's latest v1.0.39 firmware, and for the most part it looks great - up to 401 points, adjustable measurement BW, etc. All good. However, I have a strange problem with it under certain conditions:

I was setting up to measure a VHF duplexer as a test. I set Start frequency to 460MHz, Stop frequency to 475MHz, just one trace enabled to show S21, using 1kHz BW and 401 points. After setting the stimulus and trace/channel, I run though the calibration process and save it. But, once I did that, the S21 trace was above 0dB when the connectors were left open! I expected it to be -80dB or better, but got this strange result. I reverted back to my original firmware (Hugen's v0.0.5), and the problem isn't there.

Am I setting something wrong, or did I uncover a bug?

This is a group for the V2 (SAA 2) model.
I'm sure someone else will also respond to your post
in the NanoVNA group.

On Wed, 30 Sep 2020 at 23:49, Alan “W2AEW” Wolke <alan.wolke@gmail.com>
wrote:

> I updated my -H4 with Dislord's latest v1.0.39 firmware, and for the most
> part it looks great - up to 401 points, adjustable measurement BW, etc.
> All good. However, I have a strange problem with it under certain
> conditions:
>
> I was setting up to measure a VHF duplexer as a test. I set Start
> frequency to 460MHz, Stop frequency to 475MHz, just one trace enabled to
> show S21, using 1kHz BW and 401 points. After setting the stimulus and
> trace/channel, I run though the calibration process and save it. But, once
> I did that, the S21 trace was above 0dB when the connectors were left
> open! I expected it to be -80dB or better, but got this strange result. I
> reverted back to my original firmware (Hugen's v0.0.5), and the problem
> isn't there.
>
> Am I setting something wrong, or did I uncover a bug?
>
>
>
>
>
>

Yes, I realized I posted in the wrong group. I deleted the message, but I guess it got sent to anyone that is getting individual emails vs a digest. Sorry about that.

No worries :)
BTW hope you are documenting all this, it will be fun to watch ;)

On Thu, 1 Oct 2020 at 01:27, Alan “W2AEW” Wolke <alan.wolke@gmail.com>
wrote:

> Yes, I realized I posted in the wrong group. I deleted the message, but I
> guess it got sent to anyone that is getting individual emails vs a digest.
> Sorry about that.
>
>
>
>
>
>