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Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

Thanks for the info

A few thoughts:
EN for the ble module could be useful to shut it down as much as possible to lower the noise, or should we cut off its VCC in this case a p-chan mosfet on the VCC line could do.

If 2 batteries, then a boost converter could be used for charging them from the 5v. Boost converter is a mosfet, diode, coil, can be driven by the stm32 and monitored as well by the stm32 using an adc input.

Regards
Jose
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

On Fri, 22 Nov 2019 at 15:11, Ken Liao, AA6KL <kuohsing@...> wrote:

Regarding the display size, NanoVNA-F's 4.3" IPS LCD is a nice one. But
it comes at the cost of price, large battery, and extra weight. Also, its
800x480 resolution requires parallel interface to reach sub-second refresh
rate. That's why NanoVNA-F uses 100-pin STM32F103VET6. Another type of
4.3" LCD has 480x270 resolution with parallel interface only. ILI9488 only
supports 24-bit RGB at SPI interface, and ILI9486 is reaching end of
production. So it seems that this ST7796S based 4" LCD is the best choice
in term of price, weight, performance, and availability. Hugen has
installed a FFC connector at the prototype, so it should be easy to replace
the LCD if desired.

What is the resolution of the 4¡± display you intend using? Is it less than
the the NanoVNA-F? If so, I would not buy one.

The NanoVNA-F comes with a 5600 mA hr battery, which I believe will run the
unit for about 18 hours. It is not that expensive.

Screen size is the biggest problem for me with the NanoVNA, so I am willing
to pay extra for a better screen.

For the SMA or N-type socket, it's better to have IPX/IPEX/UFL sockets on
PCB, and screw the SMA or N-type sockets at the case. This will help
prevent the PCB get damaged from screw/unscrew connectors. Then, the
female N-type center pin height issue mentioned by Dr. David Kirkby can be
solved too.

No, the problem I mentioned can *not* be solved by that. The problem is
that the centre pin of a female N sticks about 5 mm in front of the
reference plane. This is in the standard for an N connector - it is 0.207¡±,
which is just over 5 mm. So if you leave a female N connector open, it will
not have a zero phase angle.

I just calibrated an 8753ES which has adapters to female N. I then removed
everything from the female N connector. I attach a Smith Chart view as
well as a phase plot. One can see that at 1.5 GHz, the phase is -20.162
degrees. So if you assume that an open female has a phase of 0 degrees,
there will be significant error. Probably around 12 degrees at 900 MHz.

Any male short standard would be nothing like 180 degrees. So the lack of a
properly implemented calibration routine would cause *very significant
errors* with the N connector.





The jog switch is a difficult one. Edy555 uses GPIO interrupt and
software debounce already. I replaced job switch's pull-up resistor from
10K ohm to 1K ohm. It seems to respond better, although not perfect yet.
If the pins are exposed, we could either connect to external buttons or
rotary encoder.

That sounds good.



Regarding the power supply, I would hope to have a way to bypass the
voltage pump circuit and use external 5V power supply when quiet power is
needed.

About the BLE support, besides the VCC, GND, RX, and TX, do we also need
other pins like SELECT, STATE and EN?

Ken

Dave

--
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

IMG_1899.jpg
IMG_1900.jpg

Re: [nanovna-f] Why are Archives visible to subscribers only?

 

I would like to see the archives, files and Wiki open, so that it may encourage others to join the group after seeing the available material. Why block information which members have freely contributed for the communal benefit?

I'd like to see the same for the nanoVNA-users group too.

Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

-----Original Message-----
From: Ken Liao, AA6KL
[]
Regarding the display size, NanoVNA-F's 4.3" IPS LCD is a nice one. But it comes at the cost of price, large battery, and extra weight. Also, its 800x480 resolution requires parallel interface to reach sub-second refresh rate. That's why NanoVNA-F uses 100-pin STM32F103VET6. Another type of 4.3" LCD has 480x270 resolution with parallel interface only. ILI9488 only supports 24-bit RGB at SPI interface, and ILI9486 is reaching end of production. So it seems that this ST7796S based 4" LCD is the best choice in term of price, weight, performance, and availability. Hugen has installed a FFC connector at the prototype, so it should be easy to replace the LCD if desired.
[]
Ken
=====================================

For me, having the extra resolution of the 4.3-inch display would be a significant benefit, and the extra size would not be unwelcome. More than 101 points per plot would be possible. The increased weight would be more than offset by increased usage time. We already see some of these advantages in the NanoVNA-F.

73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

Thanks Hugen's correction. And special thanks to Oristo8 and Larry for maintaining the wiki pages for us to quickly look for useful information.

Regarding the display size, NanoVNA-F's 4.3" IPS LCD is a nice one. But it comes at the cost of price, large battery, and extra weight. Also, its 800x480 resolution requires parallel interface to reach sub-second refresh rate. That's why NanoVNA-F uses 100-pin STM32F103VET6. Another type of 4.3" LCD has 480x270 resolution with parallel interface only. ILI9488 only supports 24-bit RGB at SPI interface, and ILI9486 is reaching end of production. So it seems that this ST7796S based 4" LCD is the best choice in term of price, weight, performance, and availability. Hugen has installed a FFC connector at the prototype, so it should be easy to replace the LCD if desired.

The LCD back light is driven by a DAC pin and a NPN BJT. So it should easy to add firmware support to control back light later.

For the SMA or N-type socket, it's better to have IPX/IPEX/UFL sockets on PCB, and screw the SMA or N-type sockets at the case. This will help prevent the PCB get damaged from screw/unscrew connectors. Then, the female N-type center pin height issue mentioned by Dr. David Kirkby can be solved too.

The jog switch is a difficult one. Edy555 uses GPIO interrupt and software debounce already. I replaced job switch's pull-up resistor from 10K ohm to 1K ohm. It seems to respond better, although not perfect yet. If the pins are exposed, we could either connect to external buttons or rotary encoder.

Regarding the power supply, I would hope to have a way to bypass the voltage pump circuit and use external 5V power supply when quiet power is needed.

About the BLE support, besides the VCC, GND, RX, and TX, do we also need other pins like SELECT, STATE and EN?

Ken
Re: Deal on ebay

 

Ditto. Would have been a 2nd one for hacking in the workshop, didn't look right and might not work but for spares was almost too cheap to ignore. Anyway ebay/paypal buyer protection works so it isn't a bad option to use.

"We've issued a refund of US $20.99 back to the original funding source you used to purchase this item. The refund includes the purchase price plus original shipping. Please allow 48 hours for it to process"

The seller looks like they had > 60% negative comments in last month so set feedback private.

72

Dom
M1KTA
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

On Fri, Nov 22, 2019 at 12:06 AM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:

- STM32F303CCT6, which has 128KB flash memory, 40KB SRAM, and 8KB CCM,
Correct, STM32F303CCT6 has 256KB FLASH.

hugen
Re: Still Looks For A good Unit

 

Thanks, that sound like one I should try. I will order one and do a review on my show. Do you mind if I mentioned that you help me find one?

Tom
Re: Still Looks For A good Unit

 

Interesting and thanks for the info.

Tom
Re: Still Looks For A good Unit

 

Thanks for the info. This one does not appear to come with a case. There are so many similar ones that have bad reviews. This particular has no reviews. Thanks for your time.

Tom
Re: Batteries

 

On Thu, Nov 21, 2019 at 04:56 AM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:

Thnx, dear 9 lined signature sales man.




On Mon, 18 Nov 2019 at 13:58, RFy <gpdxdveil@...> wrote:

450mAh is... Not suitable for NanoVNA
1. Stand-by draw
2. Charge circuit pushes over 1A( over 2C rate )

My battery already swelled( PCB/LCD curved slightly )


There are some high specification batteries for sale on eBay, at quite a
reasonable cost.




Dave.
--
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
Re: Still Looks For A good Unit

Greg Phillips
 

Hi all,

What is your opinion of this one?


thanks & 73's
Greg W4GAP
File updated in [email protected]

[email protected] Notification
 

Hello,

This email message is a notification to let you know that the following files have been updated in the Files area of the [email protected] group.

Uploaded By: Larry Rothman <nlroth@...>

Description:
This is a translated, reformatted and edited version of cho45's excellent NanoVNA User Guide. I have made the URL links live as well as added additional content in order to clarify some sections. The document is 33 pages and is formatted for printing. updated Nov-19-2019 - Added sections on Scaling and changed the touchscreen menu map to white. (Thanks Oristo)

Cheers,
The Groups.io Team
Re: Still Looks For A good Unit

 

The two small differences I can see are:

1. On mine, the upper SMA connector has a label 'CH0'
which is missing in the photo on the link.
2. The photo on the link shows what appears to be a S/N (or similar) at the
lower left. Mine has no such number in sight.
Those small differences (missing 'CHO' and lower left number) were on "worse" clones without shielding.
Re: File updated in [email protected]

 

Better still would be to get the originator to change the colors.
Re: F303 and 4" LCD for next generation NanoVNA #circuit #flash_size #improvement #enclosure #battery

 

Thanks for the update, Ken!

Hopefully, you are able to make the jog switch more responsive by using interrupts instead of polling.

As for the power circuits, it is nice to be able to use a single 3.7v Li cell with an inverter but in order to get noise levels down (you want a 3GHz top end), using two cells and running 7.2v through a low noise analogue regulator to 5V and then to 3.3V will remove most power supply noise.

The down side of 2 cells is requiring >8V for charging the batteries (and price) although with really good filtering, the unit can still be powered from the USB port.

Just some thoughts...
Larry
Re: Still Looks For A good Unit

 

Tom,

The unit at the link you provided looks identical to the Aursinc unit I bought a few weeks ago
(also from Amazon).

The two small differences I can see are:

1. On mine, the upper SMA connector has a label 'CH0' which is missing in the photo on the link.
2. The photo on the link shows what appears to be a S/N (or similar) at the lower left. Mine has
no such number in sight.

Other than those two items, this is the spitting image of mine, right down to the black Phillips-head
screws holding down the top cover. Mine does have shields covering several areas of the ECB,
and has so far been trouble free (knock on wood). I've probably done about half a dozen partial
discharge/recharge cycles, with no visible evidence of battery swelling etc.

Mine came with a handy carrying box with room for the VNA, three CAL standards, the SMA bullet,
and the two cables, all of which were included in the price.

Dana (K8YUM)
Re: USBDeview - Uninstall USB Drivers and inactive COM Ports

 

Hi Doug,

I'm glad you tried it and are happy with the little program.
I reinstalled the operating system in September, but I only see the 13 drivers I've used on this computer since it was installed.
In several forum discussions, it is noted that the driver problem is not known or difficult to handle. I hope more people can help you find a damaged or inappropriate driver and remove it. You will then need to install the recommended driver and then connect to the device. I wish everyone a successful use.

You can download the language files from here:

73, Gyula
Re: Batteries

Andy
 

On Thu, Nov 21, 2019 at 01:26 PM, Nick wrote:


Hi Andy

- How did you determine "charged"? LED not flashing?
LED stops flashing and USB current meter shows zero current being drawn (nanovna being switched off).


- What did you measure the current with?
In line USB tester. Ten for quid from China variety / Ebay ;-)

- What was the charge source? USB or something else? Need spec please.
2.1 amp USB cell phone charger, as supplied with my ancient Acer phone.

73 de Andy
Re: USBDeview - Uninstall USB Drivers and inactive COM Ports

 

You can also go to
Start >Control Panel >Device Manager >Ports (COM & LPT)
Then at the upper left corner of the window, click "View" and select "Show hidden devices". Once you can see them, you can right-click on one you don't want and select "Delete" to remove it. I removed 9 or 10 com ports created by USB serial ports connecting to my digital control ham radio equipment.
It also lists "USB Human Interface Device" 48 times (on my Vista PC).
Unfortunately, when I right-click and select "Properties" for those ports, there is no information about the device, so no way to know whether that device is still needed. The USB Serial Port for the NanoVNA is listed as "STMicroelectronics Virtual Com Port (COM9). I have one other port listed, "USB Serial Port (COM3), which only shows up when "Show hidden devices" is selected.

My NirSoft "USBDeview" tool shows 312 USB Devices!
NirSoft makes some very handy, very good tools.

Doug
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