开云体育

Hej Rune

Here are some more ideas.

Loading (importing) S-files. Try to identify the source program, but also show the first five, or a bit more, lines of the file. Then ask the the user to confirm the source program/format from a number of radio buttons.

Adding tooltips can perhaps improve the usage/understanding of the various buttons and input fields.

To the right of the sweeps write the Hz/div. and dB/div.

Bo

I rolled the dice, now we wait...

To use the Nano, it is no problem that the IP5303 switches off after 35 seconds when switching off. For a battery pack with a low consumption device connected, that is something else.
The problem that I often hear is that the IP5303 does not switch on, with a consumption higher than 45 mA. I have already replaced and restored just about everything around the IP5303, but that doesn't help. The normal functions continue to work, only the start-up does not work.
The only solution is to start the IP5303 via the key pin 5 with a push button. This is only a partial solution, because after connecting the USB cable it no longer works.
After several days of measuring and testing, and 2x replacing an IP5303, I finally found a deviation. All measurements of the NanoVNA power consumption described here are actually wrong. You will not find any deviations.
However, if you are going to measure the power consumption of the IP5303 yourself, we will notice weird deviations.
The third day I planned to do only current measurements on the IP5306 and its components.
Like 'tinhead' suggested to place a resistor on C47, instead of a resistor I made a print with 4 lamps 6V / 60mA, and a 4-pole DIP switch.
This way I could switch the load per 60 mA on and off to observe the behavior of the IP5306.
Since the NanoVNA does not participate this time, the current must be measured at the 3.70V battery and not at the ON / OFF switch.
These prior measurements gave strange results:
Current measurement of the IP5303 in standby mode (32 sec): 2.70 mA
Current measurement of the NanoVNA, including the IP5303: 237mA!
Current measurement of the NanoVNA, minus the IP5303: 130mA.
Conclusion: the IP5303 has (too) high self-consumption.
I discovered that the IP5303 only worked well up to 222 mA. In addition, the IP5303 goes into a kind of protection mode, and switches off completely after about 10 seconds.
The following measurements are with my own load (lamps), without the Nano switched on.
With my external load I can therefore switch on 1,2,3 or 4 lamps.
1 lamp = 60 mA, 2 lamps = 120 mA, 3 lamps = 180 mA, 4 lamps = 240 mA.
With the standard inductor of 2.2 ?H (1 ?H also works, but the oscillator frequency is higher) and a load with:
1 lamp: current was 90.0 mA -> 30 mA too much
2 lights: current was 185 mA -> 65 mA too much!
3 lights: current was 276 mA -> 36 mA too much!
The load with 4 lamps did not want to start anymore.
This is really too much for the small Li-ion battery.
Strange is that the IP5303 with my own load did not fail, with the NanoVNA switched on it did fail.
So the ultimate consequence is that the NanoVNA does not want to start up, because it itself already needs 130 mA.
I did the same measurements again with a lab power supply connected instead of the battery, but the measurements were not much different.
The question is why the IP5303 does not meet its specifications.
There are probably some IPs that do not work well in some NanoVNAs.
Or some NanoVNAs have a slightly lower power consumption. I replaced the IP5303 twice, I was not lucky twice.
I'm still going to try with an IP5306, which could handle a slightly higher steam. But they still have to be ordered.

Probably the same seller as I posted since the write-up and pictures are identical.

it looks strange, only a few buyers, some of them are no longer registered, other buyers did buy a lot of things from him.

Am 30.09.2019 um 17:45 schrieb Larry Rothman:ther buy a lot of items from him...

I was hoping somebody would ask!
The bridge is simetrical. Just in your mind rotate it 90 degrees. I discovered using it this way improved directivity above 2 GHz

Any way you cut it, this is for gamblers... :-)
Mike WY6K


"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

The other items for sale do not show for me?

On Mon, 30 Sep 2019 at 09:09, Kurt Poulsen <kurt@...> wrote:

basic knowledge about a transmission line.pdf

I like TinyURL for pasting links into email.


With the Preview feature, you can see what the destination will be
before you click it.
--buck

No, he still has them for sale - and a number of other things.? He has sold 130 NanoVNAs.? Now there is another Hong Kong seller selling them for $16.99.? That, in my mind, makes it less likely that the low price was a listing error and more likely it is a scam.? We buyers will get our money back if it is a scam? - eBay or Paypal will get stuck.? The log delivery time of 4-6 weeks means we won't know until mid- Nov.
Or, they might be dumping inventory to get liquidity.? Perhaps having something to do with the unrest?
Mike WY6K


"... somewhere in the distance, there's a tower and a light, broadcastin' the resistance, through the rain and through the night..."

On Mon, 30 Sep 2019 at 16:45, Larry Rothman <ac293@...> wrote:

Another eBay 'seller' - look for item# 362769877272 Now $17US

Probably a hijacked account.

Accounts do tend to get hijacked at the weekend, as legit sellers often not
working then.

--
Dr. David Kirkby,
Kirkby Microwave Ltd,
drkirkby@...

Telephone 01621-680100./ +44 1621 680100

Registered in England & Wales, company number 08914892.
Registered office:
Stokes Hall Lodge, Burnham Rd, Althorne, Chelmsford, Essex, CM3 6DT, United
Kingdom

my email is xeroxss@...

Hi @neb40gsm, may I request for a copy of your software to test thanks a lot!

I wonder if both accounts might have been hijacked.
Both sellers are in Hong Kong and China is trying its best to make Hong Kong look bad to the rest of the world.
Just a thought - but you never know.
I guess we'll all find out if eBay gives us back our money.

On Mon, Sep 30, 2019 at 03:09 PM, Kurt Poulsen wrote:

Hi Again Erik

This time by creating a new mail I succeded

basic knowledge about a transmission line.pdf
<
on%20line.pdf>

Kind regards

Kurt

Hi Kurt many thanks for sharing the documents related to transmission line and calibration kits. I have a lot to learn about it. In the workplace I used VNA for years, but I was focused on developing programs to automate measurements. I had experience with hp8510C, hp8753D . I remember the satisfaction I experienced the first time I completed the Calibration procedure and subsequent verification with verification kit in 2.4mm on the first attempt.
Best Regards
IZ1MDJ Maurizio

paul.riggott wrote ...

"Now that seller does not have anything to sell, looks as if it was a scam."

---------------------------------------------------------------------------------------------------------

I count over 50 different items still for sell on his eBay store ( ).

If it is a scam whoever bought one will be in good company as he has sold over a hundred nanoVNA's, and they shouldn't have any problems getting a refund from eBay if that many complaints start pouring in.

On the other hand, this seller ( ) at $17 I wouldn't touch with a 10 foot pole. Limited number of feedbacks, all feedback has almost identical wording, delivery date could be as long as 6th Dec.

Another eBay 'seller' - look for item# 362769877272 Now $17US

Probably a hijacked account.

Hi Erik,
congrats! But one fundamental question: Why do you connect the output of your bridge with an oscillator? (a joke or a mistake ?)
Another question: You have 3 mixers, but only two audio channels. ???
73, Wolfgang DH1AKF

Or he had just a few "seconds" to sell and with all the attention he got
from this thread they sold out quickly! :-))

Roy
WA0YMH

On Mon, Sep 30, 2019, 10:23 AM paul.riggott via Groups.Io <paul.riggott=
[email protected]> wrote:

Now that seller does not have anything to sell, looks as if it was a scam.

As for remote control via smartphone, a simple way to do it would be to
leave the USART2 pins available for external serial connection (that is PA2
and PA3), from there, an external additional bluetooth serial adapter
(HC-06 for instance) would make the commands available to a smartphone.
Currently PA2 and PA3 and used for the switches, but I can see that other
I/O pins are available.