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I changed the subject, as it seemed that we are no longer discussing the 180 degree item...

And...I hope that I got this correct...still getting organized here wrt all the versions and programs.

I loaded -H,
set the range to 50 kHz - 1500 MHz (not 900?),
set CH0 LOGMAG and CH1 LOGMAG
RESET
started nanovna-saver.v0.1.4
connected
clicked sweep
recorded nanovna-saver 0.1.4 NanoVNA-H_v0.2.3-2-g8ac9166_3.png

loaded -Q
same steps
recorded nanovna-saver 0.1.4 NanoVNA-Q-0.4.2-bf9c4b_3.png

I don't know what to expect, so would appreciate detailed feedback...and if I didn't do it correctly, please advise, and I'll be happy to redo.

~R~

--
On the banks of the Piscataqua
Rich NE1EE

Depending on the firmware you load the uncalibrated uncorrected S11 and S21 make little or a bit sense.
Unless you want to understand the calibration process do not look at uncalibrated and uncorrected data

Rich, what is hooked up to Ch0 and Ch1?

- Jeff, k6jca

Nothing...QRP simply asked for RESET readings, so I figured that both ports should be left completely open.

I don't know why the request was made, and I am pretty new to all this...
Originally part of this thread about S11 open and short Smith chart views
/g/nanovna-users/message/5973

I posted a new thread because it seemed to me that we might want to discuss what these LOGMAG displays are supposed to mean.

If the ports should be terminated for this test, I can repeat. I believe that I have purchased a good piece of hardware. This request was because I commented that I was having more difficulty calibrating -Q than -H on the same platform. It may well have simply been that I was too new, and reporting what I saw, without understanding what state the device was in.

73

--
On the banks of the Piscataqua
Rich NE1EE

I don't know why the request was made, and I am pretty new to all this...

Please do, with 50 Ohms directly terminating CH0 and also CH1
The request was for gathering statistics on terminated values before calibration.

Originally part of this thread about S11 open and short Smith chart views

Yes, in the context of being calibrated (with 50 Ohms @ CH0, CH1)

On 2019-10-30 08:22:-0700, you wrote:

I don't know why the request was made, and I am pretty new to all this...

Please do, with 50 Ohms directly terminating CH0 and also CH1
The request was for gathering statistics on terminated values before calibration.

I have only 1 50 O at this point...more on order. I wish that we had a vetted supplier of low cost terminators.
I can do one port at a time if that is useful.
Not sure when to expect the others...have not gotten an ETA yet.

Originally part of this thread about S11 open and short Smith chart views

Yes, in the context of being calibrated (with 50 Ohms @ CH0, CH1)

Thanks for that.

73



--
On the banks of the Piscataqua
Rich NE1EE

I can do one port at a time if that is useful.

Cross-talk will change, but better than none.
FWIW, CH1 precision is less critical;
I use uncalibrated 50 Ohm BNC with SMA adapter.

On Wed, Oct 30, 2019 at 03:33 PM, Rich NE1EE wrote:

I don't know what to expect, so would appreciate detailed feedback...and if I
didn't do it correctly, please advise, and I'll be happy to redo.

Do the same with load on CH0 and CH1

On Wed, Oct 30, 2019 at 03:52 PM, <erik@...> wrote:

Unless you want to understand the calibration process do not look at
uncalibrated and uncorrected data

There is a testing of hardware, to make sure that it provides adequate measurements.
With calibration enabled possible hardware issues will be hidden by calibration.
This is why I asked for screenshot with CAL RESET.

On Wed, Oct 30, 2019 at 06:15 PM, Rich NE1EE wrote:

I have only 1 50 O at this point...more on order. I wish that we had a vetted
supplier of low cost terminators.

connect it to CH0, leave CH1 open