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Re: NanoVNA software developers wanted #hacking

vaclav_sal
 

For anybody interested in USB / bluetooth dongle hardware - I have these two , both capable passing "audio data" (?) -
I did nor research that any further. Older stuff / versions in range $5 US.

Bus 001 Device 005: ID 0a5c:2121 Broadcom Corp. BCM2210 Bluetooth
Bus 001 Device 012: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

hci1: Type: BR/EDR Bus: USB
BD Address: 00:15:83:15:A2:CB ACL MTU: 672:4 SCO MTU: 48:1
UP RUNNING PSCAN ISCAN
RX bytes:978 acl:0 sco:0 events:43 errors:0
TX bytes:666 acl:0 sco:0 commands:43 errors:0

hci0: Type: BR/EDR Bus: USB
BD Address: 00:50:B6:80:4D:5D ACL MTU: 1017:8 SCO MTU: 64:0
UP RUNNING PSCAN ISCAN
RX bytes:1030 acl:0 sco:0 events:49 errors:0
TX bytes:705 acl:0 sco:0 commands:49 errors:0
Re: Looking for firmware with battery indicator, 1500 and big font

 

yeah, this is typical mistake to do something right after clearconfig.
You're needs to power off/power on after clearconfig.
If you don't power off device after clearconfig, it will leads to restore bad config.
Re: NanoVNA software developers wanted #hacking

 

I need to integrate Eclipse GUI with NanoVNA "stuff"
/g/nanovna-users/wiki/Building-Firmware
Re: Looking for firmware with battery indicator, 1500 and big font

 

clearconfig 1234
Power off, then back on, for clear to take effect

Now try to re-cal.
Re: Chasing ghosts??? One ghost found #internals #calibration

 

Minute, basically two 50ohm loads on a SMA tee

--
Erik, PD0EK
Re: Building the firmware

 

try and build the firmware under Windows
/g/nanovna-users/wiki/Building-Firmware
Re: Looking for firmware with battery indicator, 1500 and big font

 

Actually, if you have a continual problem trying to calibrate, go to the console mode and run the following command:
clearconfig 1234
Now try to re-cal.? I found that fixed my issue when the 'reset' did not work.
...Larry

On Thursday, November 7, 2019, 10:10:20 a.m. GMT-5, DL9CAT <groups.io@...> wrote:

The calibration process does not differ from ttrftech only the used font has larger characters. If there are problems calibrating select CAL->RESET before calibrating. Ensure that your used load is really 50 Ohm, I have 3 broken ones up to now...
Re: Looking for firmware with battery indicator, 1500 and big font

 

The calibration process does not differ from ttrftech only the used font has larger characters. If there are problems calibrating select CAL->RESET before calibrating. Ensure that your used load is really 50 Ohm, I have 3 broken ones up to now...
Re: Chasing ghosts??? One ghost found #internals #calibration

 

On Thu, Nov 7, 2019 at 12:06 AM, <erik@...> wrote:


DUT is a 25 ohm resistor close to the reference plane with a small amount of
parallel capacitance
Erik,

Do you know how much capacitance was present in parallel with the 25 ohm load?

--
Bryan, WA5VAH
Re: Chasing ghosts??? One ghost found #internals #calibration

 

The non-linearity is even better visible at S21 with different levels of attenuation.
I used 0dB, -10dB, -20dB, -30dB attenuators and thru calibration derived from 0dB (that is why 0dB is a straight line as ) and moved them all to 0dB (which they are not)
Above 600MHz its worst
These attenuators are usable till 3GHz so I assume (to be verified on 3GHz VNA) this pattern is not caused by the attenuators
--
Erik, PD0EK

S21.PNG

Re: Chasing ghosts??? One ghost found #internals #calibration

 

i think tdr 3x "reflection" is aliases. See dg8saq vna software. Valid range computed by software.
Re: Chasing ghosts??? #internals #calibration

 

I repeater the nanoVNA measurements while running the nanoVNA from a clean 5Volt supply
No differences in measuring the 25ohm resistor or the cables

--
Erik, PD0EK
Re: Chasing ghosts??? One ghost found #internals #calibration

 

The reduced power measurement makes more sense
So highpass filter is wanted on stimulus for harmonics modes.
Re: Chasing ghosts??? #internals #calibration

 

Adding a ferrite core improved results with USB connection:
Unfortunately ferrite don't helps
On my unshielded black "worse" nanoVNA before adding ferrite,
differences in Smith and logmag noise for 50 Ohm CH0 termination in 100-1200MHz sweeps
with and without USB attachment was easily seen.
Re: errors of "error" models

 

#74: The Virtual Port - "Revealing" the Most Confusing "Secrets" of "Error" Models

Hello,

Allow us, please, to "reveal" that:

- - - - - - (c) gin&pez@arg (cc-by-4.0) 2019 : start - - - - - -

In our sow, every "error" model has at least one real load port and at least one
virtual measurement port.

- - - end : (c) gin&pez@arg (cc-by-4.0) 2019 - - - - - - - - - -

Would you, please, think about it ?

Sincerely,

gin&pez@arg

:74#
Re: errors of "error" models

 

@Erik, PD0EK - 6 November 2019:
/g/nanovna-users/message/6539

Dear Erik, This is not a stupid question. Best regards, gin&pez@arg

PS More on that by Gary, N3GO - 6 November 2019:
/g/nanovna-users/message/6566
Re: Chasing ghosts??? #internals #calibration

 

On Tue, Nov 5, 2019 at 10:47 AM, Oristo wrote:


Adding a ferrite core improved results with USB connection:
Unfortunately ferrite don't helps, the problem with IP5303, the result is worse when external voltage is applied. It doesn't matter if voltage is pure clean (from the battery) or has some kind of PC noise.

But you can wait when charge LED will stops to blink (charge end), after that it works better with USB connection. Not as good as with no cable, but close to that.
Re: NanoVNASaver QT Platform problem (won't load)

 

On Wed, Nov 6, 2019 at 09:25 PM, Jim Allyn - N7JA wrote:


Windows Vista is out of support and no longer updated, so, if you continue to
use it, at a minimum you should keep it off the internet.? I have updated
many older computers running Vista, XP (and even earlier versions) to Linux.
I'm using Windows XP, it works great. Linux with X11 is much slower and requires more RAM.
Internet on Windows XP also works ok. Some issues with SLL, but there is exists patch from MS, which allows to fix SSL issues.
Firefox works ok. :)
Re: Chasing ghosts??? One ghost found #internals #calibration

 

Nothing in TDR apart from the reflection at the end
I'm using a 1000 point calibration exactly matching the measurement points
--
Erik, PD0EK

TDR.PNG

Re: NanoVNASaver QT Platform problem (won't load)

 

When I tried to install Python on a machine that didn't have it,
but I didn't know it because it was missing a piece of Ms VC ++.
In my opinion, if your basic operating system is OK,
you can install MS VC ++ (multipack 2005-2017) on it without error,
and the nanoVNA-Saver that uses a lot of graphics will work.
For Vista, v2015-14.0.24215 is wanted according to this:
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