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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Quite a collection Merle,
Are either of your other two NanoVNA's able to connect to your Samsung Galaxy 8+? If so, then the nanoVNA-H4 should be able to connect by the same means. If not, then the C-to-C able also will not work. The NanoVNA android app is finicky regarding versions and android devices. The webapp mostly works even when the Playstore apk will not, but you have to be connected on-line. - Herb |
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Re: USB over CAT5 hardware
KV5R
Oh! I should add, just for completeness,
1. After the antenna is matched (near 1:1 SWR) feed-line length doesn't matter (up to the point where matched-line loss is significant), and 2. Wind coax thru a toroid a few times to make a choke, near the antenna, so the shield of the coax, and the nano, are not part of the radiating structure. 73, --kv5r |
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
On Mon, Jan 20, 2020 at 12:16 PM, David Eckhardt wrote:
" I have no problem with AliExpress¡" ==================================================== If you prefer AliExpress then you might try the link below. The Deepelec Store is the official retailer for the NanoVNA-f and have also partnered with hugen to sell the NanoVNA-H4. I am not associated and came across this information during a casual web search. - Herb |
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Received my H4 today and excellent packaging.
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Two issues surfaced almost immediately. 1. H4 would not connect to my Samsung Galaxy 8+ with c to c cable provided. Using the VNA app from cho45. 2. The female to female connector has one end plugged up. Cannot screw on cable. Tried a quick cal using a f to f connector from my original VNA and it calibrated fine. Now it is play time. I now have the original VNA, VNA-F, VNA-H4 Merle On Mon, Jan 20, 2020 at 12:10 PM Lucio I?LYL <lucio.i0lyl@...> wrote:
nanoVNA-H4 (using STM32F303CCT6 and 4-inch LCD) arrived today via UPS. |
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob Albert
It's a USB C-port, the unpolarized type.? Very tiny pins, very close together.? I have the connector but not the ability to solder it in.
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Bob On Monday, January 20, 2020, 12:08:22 PM PST, Larry Rothman <nlroth@...> wrote:
Bob, Your unit that had the USB connector come off - was that a micro-USB or a USB-C part? Thanks,Larry? -? not Mike ;-) ? ? On Monday, January 20, 2020, 1:38:51 p.m. GMT-5, Bob Albert via Groups.Io <bob91343@...> wrote: ? Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:38:13 AM PST, Bob Albert <bob91343@...> wrote: ? Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:31:32 AM PST, Bob Albert via Groups.Io <bob91343@...> wrote: ? Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:13:05 AM PST, n2msqrp <mstangelo@...> wrote: Bryan, Thanks. I thought it had to do with the mismatch between the coax and S11 port. I had a length of RG-6 handy and see the same effect with that 75 ohm cable and see the same effect. Since the loss of the Rg-6 is higher the step responses is decreasing at a faster rate. I have a 75 to 50 ohm pad. If I have time I may connect the pad to the S11 port, run a calibration using a 75 ohm load and run the test again. Mike N2MS
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Re: Improving the performance of a pre-V3.4 original Hugen nanoVNA
I just measured
Depending on the frequency 50 +/- 3 ohm Well centered -- NanoVNA Wiki: /g/nanovna-users/wiki/home NanoVNA Files: /g/nanovna-users/files Erik, PD0EK |
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Re: USB over CAT5 hardware
KV5R
Old-timer trick: A half-wave (and multiples thereof) of feed-line will "repeat" the feed-point impedance at the other end.
Take your frequency, and the velocity factor, and determine length of a half-wave, then make the line. Then set the nano's sweep range close to the intended frequency (maybe +- 500kHz), and do an OSL calibration at the end of the feed-line (SO239-to-SMA adapter with the supplied SMA OSL's works fine at HF). Then connect it to antenna and raise it to operating height. The nano should show the actual feed-point impedance of the antenna, just as if there were no feed-line between them. 73, --kv5r |
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Re: Corrupted firmware.
Try this:
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- attach the nano to the problem pc and turn on in dfu mode - open Devices from the control panel - delete the nano usb device AND its driver that is showing it's in dfu mode - turn off the Nano and try dfu mode again - when Windows senses the device, it should request the dfu driver - point it to the STM driver files (mentioned in the wiki) you installed. NOTE: make sure you're using the right 32 or 64 bit drivers for your PC! On Monday, January 20, 2020, 3:28:15 p.m. GMT-5, brianbgarber via Groups.Io <brianbgarber@...> wrote:
Thank you so much for your patience with me! I wasn't able to get that to work on my laptop, however I tried a different computer and updated the nanoVNA without issue. So now I'm wondering if I need to delete the registry value on my laptop that corresponds to that device. This is strange, but I'll chock it up to Windows! Thanks again, Brian |
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Re: Corrupted firmware.
KV5R
It's a common problem. Search this forum for "STM device in DFU mode" using the Search box at top of page.
For some reason Windows sometimes replaces the driver "STM device in DFU mode" (for DfuSe Demo software) with the driver "STM32 BOOTLOADER mode" (for the ST-Link dongle). The BOOTLOADER driver will not work with DFUse Demo. Delete the BOOTLOADER driver (with Device Manager or USBDview) and then reinstall DFUse Demo software, it should put the "STM device in DFU mode" driver back (I think). 73, --kv5r |
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Re: Corrupted firmware.
Thank you so much for your patience with me! I wasn't able to get that to work on my laptop, however I tried a different computer and updated the nanoVNA without issue. So now I'm wondering if I need to delete the registry value on my laptop that corresponds to that device.
This is strange, but I'll chock it up to Windows! Thanks again, Brian |
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PAYING ALIBABA for ORDERS
Even before the Chinese New Year, I cold not get my order paid. The
'error' message, rejection of my credit card, reflected they would accept only a back transfer and displayed the instructions. I really don't care for this type of financial transaction, especially with China. I have no problem with AliExpress, just Alibaba. But the only place you can be sure you are not paying for a clone is from Alibaba. Grrrrrrr...rrr....rrr. Dave - W?LEV |
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
Even before the Chinese New Year, I cold not get my order paid. The
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'error' message, rejection of my credit card, reflected they would accept only a back transfer and displayed the instructions. I really don't care for this type of financial transaction. I have no problem with AliExpress, just Alibaba. But the only place you can be sure you are not paying for a clone is from Alibaba. Grrrrrrr...rrr....rrr. I've emailed Dave - W?LEV On Mon, Jan 20, 2020 at 7:42 PM n2msqrp <mstangelo@...> wrote:
When I purchaed the nanaVNA-H4 I logged into the Alibaba website and send --
*Dave - W?LEV* *Just Let Darwin Work* *Just Think* |
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob,
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Your unit that had the USB connector come off - was that a micro-USB or a USB-C part? Thanks,Larry? -? not Mike ;-) On Monday, January 20, 2020, 1:38:51 p.m. GMT-5, Bob Albert via Groups.Io <bob91343@...> wrote:
Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:38:13 AM PST, Bob Albert <bob91343@...> wrote: ? Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:31:32 AM PST, Bob Albert via Groups.Io <bob91343@...> wrote: ? Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:13:05 AM PST, n2msqrp <mstangelo@...> wrote: Bryan, Thanks. I thought it had to do with the mismatch between the coax and S11 port. I had a length of RG-6 handy and see the same effect with that 75 ohm cable and see the same effect. Since the loss of the Rg-6 is higher the step responses is decreasing at a faster rate. I have a 75 to 50 ohm pad. If I have time I may connect the pad to the S11 port, run a calibration using a 75 ohm load and run the test again. Mike N2MS
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Re: We started selling nanoVNA-H4 using STM32F303CCT6 and 4-inch LCD
When I purchaed the nanaVNA-H4 I logged into the Alibaba website and send her a message requesting information about purchasing via paypal. That is how I got the instructions.
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As others have mentioned it is Chinese New Year and they may be closed. Mike N2MS On January 20, 2020 at 10:14 AM "tom verra via Groups.Io" <mnv73@...> wrote: |
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob,
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I think you are mixing messages but I just purchased the NanoVNA-H-4 with the 4 inch screen. If you're considering another I would get this unit. Mike N2MS
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Re: Improving the performance of a pre-V3.4 original Hugen nanoVNA
I'm very sorry, a typo, the TX (CH0) is not that bad, I measured and found while symulating 58.82 Ohms, *NOT 68.82 Ohms.
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* *Jos * Op 20-1-2020 om 15:49 schreef hugen@...: On Mon, Jan 20, 2020 at 09:24 PM, hwalker wrote:A similar discussion in Japanese (use Google translate or similar)I checked the content of this blog and some of the issues mentioned come from the wrong shield of the bad clone. Some modifications may not apply to a good NanoVNA. Our manufactured NanoVNA-H has good isolation.If you have better suggestions for improvements that can be feedback on github, we will try it and apply it to the next version of NanoVNA-H after verification, and send you the improved version to verify the modified effect. |
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob Albert
Mike,
toggle quoted message
Show quoted text
Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob On Monday, January 20, 2020, 10:38:13 AM PST, Bob Albert <bob91343@...> wrote:
Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob On Monday, January 20, 2020, 10:31:32 AM PST, Bob Albert via Groups.Io <bob91343@...> wrote: Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:13:05 AM PST, n2msqrp <mstangelo@...> wrote: Bryan, Thanks. I thought it had to do with the mismatch between the coax and S11 port. I had a length of RG-6 handy and see the same effect with that 75 ohm cable and see the same effect. Since the loss of the Rg-6 is higher the step responses is decreasing at a faster rate. I have a 75 to 50 ohm pad. If I have time I may connect the pad to the S11 port, run a calibration using a 75 ohm load and run the test again. Mike N2MS
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob Albert
Mike,
toggle quoted message
Show quoted text
Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob On Monday, January 20, 2020, 10:31:32 AM PST, Bob Albert via Groups.Io <bob91343@...> wrote:
Mike, Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob ? ? On Monday, January 20, 2020, 10:13:05 AM PST, n2msqrp <mstangelo@...> wrote: Bryan, Thanks. I thought it had to do with the mismatch between the coax and S11 port. I had a length of RG-6 handy and see the same effect with that 75 ohm cable and see the same effect. Since the loss of the Rg-6 is higher the step responses is decreasing at a faster rate. I have a 75 to 50 ohm pad. If I have time I may connect the pad to the S11 port, run a calibration using a 75 ohm load and run the test again. Mike N2MS
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Re: TDR Measurement with NanoVNA Saver
#nanovna-saver
#tdr
Bob Albert
Mike,
toggle quoted message
Show quoted text
Thanks for the information.? I did not buy the device because I have a second nano that does okay.? But after reading your latest suggestion I guess I'll buy the thing and see if I can upgrade without bricking the unit.? It should also be a door to future upgrades.? Perhaps I can upgrade the second nano via its USB port but that unit is flaky and turns itself off without provocation.? It won't even turn on while the port is connected, and sometimes even when not connected it fails.? Once on, I can connect the port.? Then suddenly it behaves properly. I did have thoughts of replacing the USB connector but it takes ability that I lack.? I think over a dozen tightly spaced pins and limited access and tools. Bob On Monday, January 20, 2020, 10:13:05 AM PST, n2msqrp <mstangelo@...> wrote:
Bryan, Thanks. I thought it had to do with the mismatch between the coax and S11 port. I had a length of RG-6 handy and see the same effect with that 75 ohm cable and see the same effect. Since the loss of the Rg-6 is higher the step responses is decreasing at a faster rate. I have a 75 to 50 ohm pad. If I have time I may connect the pad to the S11 port, run a calibration using a 75 ohm load and run the test again. Mike N2MS
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Merle W
Brian Garber
Gyula Molnar
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