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On Mon, Aug 3, 2020 at 08:23 PM, igor-m wrote:

What is the max frequency set? I cannot do 2000MHz (v0157, H4 108fw).
Also the BW - sometimes it takes over what has been set in H4, once it
overwrites the H4, not sure I understand it how it should work.

Do you mean the "bandwidth" settings Igor ?

If so, that is not the scan frequency, that is the baseband bandwidth, which can be set to 10Hz to 4000Hz .. NOT MHz

The baseband bandwidth is the bandwidth seen by the VNA at each scan spot frequency as it scans across the scan range. The higher the baseband bandwidth the faster the VNA scans, so low bandwidth settings make the VNA scan very slowly.

On Mon, Aug 3, 2020 at 01:12 PM, DiSlord wrote:

better reset config, 'clearconfig 1234'
And made touch calibration if need, after save config (config->save)

Thank you DiSlord, you are the best.
You have really done impressive upgrades!
I'm new to this firmware so got questions :-)
Appart from saving the params to card, is there a feature to take screenshots saved in card too?

On Mon, Aug 3, 2020 at 01:04 PM, Christos SV1EIA wrote:

Is it required to perform any other type of manual command and initialization
from the console prior to use the newly flashed firmware ?

better reset config, 'clearconfig 1234'
And made touch calibration if need, after save config (config->save)

On Mon, Aug 3, 2020 at 12:44 PM, DiSlord wrote:

read this post
/g/nanovna-users/message/14447

Thanks DiSlord,
I see how to change the date/time in the post you mention.
Is it required to perform any other type of manual command and initialization from the console prior to use the newly flashed firmware ?

Add anothes screenshot 30dB up to 2.7GHz
I think it very good perfomance for H4

PS i not good in hardware, but possible need change filter to AIC ADC for get better results

While test 192k ADC i found interesting thing

Can you check work your H4 up to 2.7 GHz in different modes vs this firmware?

PS i see good results up to 2GHz, but and to 2.7GHz results not bad.
see screenshot
1-2.7GHz vs 40dB attenuator
1-2GHz vs 60dB attenuator

PS also fix some bugs, made startup more safe, BW show update after console command
PS 192k ADC code upload to git, but not enabled

On Mon, Aug 3, 2020 at 12:38 PM, Christos SV1EIA wrote:

Hi,

Got a H4.
A few questions

1. After flashing the new firmware, is it required to perform any type of
manual command and initialization from the console commannds ? Obviously the
previous calibrations are not valid anymore. What do I need to clean ?
2. What type of SD cards should I use, is there any recommendation on size or
brand/type ?
3. How can I enter the date/time ?
4. Is there any document that describes the new functionality or is there
anyone that can give a small synopsis, a brief of additions?

Any help is appreciated.

73,
Christos SV1EIA

read this post
/g/nanovna-users/message/14447

Hi,

Got a H4.
Managed to get and solder the proper SD card part based on DiSlord's hint on what to buy.
Also soldered the required 32.768KHz osc.

My previous version is the latest release from Hugen's github.
And now I have flashed the new version from DiSlord.

A few questions

1. After flashing the new firmware, is it required to perform any type of manual command and initialization from the console commannds ? Obviously the previous calibrations are not valid anymore. What do I need to clean ?
2. What type of SD cards should I use, is there any recommendation on size or brand/type ?
3. How can I enter the date/time ?
4. Is there any document that describes the new functionality or is there anyone that can give a small synopsis, a brief of additions?

Any help is appreciated.

73,
Christos SV1EIA

On Mon, Aug 3, 2020 at 09:23 PM, igor-m wrote:

What is the max frequency set? I cannot do 2000MHz (v0157, H4 108fw).

ok, I can set for example 1500MHz or 2000MHz but it disconnects the H4 from serial, it also offers to save the .bmp file when clicking on Scan.

What is the max frequency set? I cannot do 2000MHz (v0157, H4 108fw).
Also the BW - sometimes it takes over what has been set in H4, once it overwrites the H4, not sure I understand it how it should work.

On Mon, Aug 3, 2020 at 04:01 AM, OneOfEleven wrote:

Thank you for letting me know.

I've been trying to find the problem, but I highly suspect the bluetooth
driver has a bug from what I've read around the net.
I've set up 4 different types of serial USB to try to find the problem,
including the same type of bluetooth comport you have Alzeis, but I can't yet
reproduce the lock up, I get no lock ups. I won't stop looking until I find
the cure.

I am not sure but I think this serial link over bluetooth comes from a Samsung phone USB driver...

As a first step before replacing I would try to determine what is my Si5351 max overclocked frequency (where it will not crash inside the closed case without the heat-sink on it)..

On Mon, Aug 3, 2020 at 07:07 PM, DiSlord wrote:

up to 100MHz si5351 use fixed PLL (32*26MHz = 832MHz) mode and fractional
divider for set output frequency, noise depend from how big PLL freq

From 100-150MHz used fractional PLL multiplier and constant divider = 6 (PLL
at result 600-900MHz)
From 150-900MHz used fractional PLL multiplier and constant divider = 4 (PLL
at result 600-1200MHz)

As can see fractional PLL mode - more noise (also you can see spike near
150MHz on switch, after little less noise and after more up)

After 300MHz used 3 harmonic
After 900MHz used 5 harmonic
And so on

I wonder whether the SA612 mixer's clock level (from the SI5351 output) is intentionally so high (3.3Vpp) to get a lot spectral mess out of it.
From my experience the max is 0.2Vpp with SA/NE602/612 when driven from an external source.

On Mon, Aug 3, 2020 at 06:09 PM, DiSlord wrote:

You can add DFU mode flash firmware :) DFU SE demo sources is open

Send command 'reset dfu' and flash, it allow more easy update :)

I already have, all the code has been in there from the beginning, I just haven't finished it and added the "upload firmware" button, it would accept .dfu, .hex and .bin files.

I think need replace damaged si5351, in my NanoVNA need only put finger on it. I add thermal foto in this topic, temperature ?40-45 degrees Celsius

Or execute external DFU program vs options (it more easy)

You can add DFU mode flash firmware :) DFU SE demo sources is open

Send command 'reset dfu' and flash, it allow more easy update :)

up to 100MHz si5351 use fixed PLL (32*26MHz = 832MHz) mode and fractional divider for set output frequency, noise depend from how big PLL freq

From 100-150MHz used fractional PLL multiplier and constant divider = 6 (PLL at result 600-900MHz)
From 150-900MHz used fractional PLL multiplier and constant divider = 4 (PLL at result 600-1200MHz)

As can see fractional PLL mode - more noise (also you can see spike near 150MHz on switch, after little less noise and after more up)

After 300MHz used 3 harmonic
After 900MHz used 5 harmonic
And so on

Anyway, might be time to move PC software diskushuns to it's own thread rather than this one (this one was meant for the firmware), this ones getting a bit big and cluttered.

On Mon, Aug 3, 2020 at 05:28 PM, igor-m wrote:

I painted the red line there to show the shape of the S11.
Rather flat till 100MHz and then up..

ah I see. Was racking my brains trying to work how on earth that red line got there, thought it was a bug :)

It is rather steep isn't it. I've seen worser on my little H !

I've added a simple bandwidth edit box (for now at least) so as the bandwidth can be set to ones deepest desired number - so long as it's with in range of cause, which it will tell you if it isn't.