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Crazy display on power-up.
Anne Ranch
Is this normal ?
I have not checked my nano firmware version , got other "honey does" I am just curious , not panicking , not yet. On initial power -up I get splash of white screen then splash , impossible to read "fine print " too fast , of logo then the display just goes nuts... I call it "4th of July (static) fireworks. I can access the menus etc.... |
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Re: Any more "development " in bluetooth?
#bluetooth
Anne Ranch
Originally I did not see much benefits to put the nano into a box, however, after "reading the mail " here I see a "major" issue with the SMD coax connectors breaking off.
So I am not after making it bulletproof and super mini portable , but if I can convince my teenage grand-kid , owner of 3D printer , to print me suitable enclosure - with the goal to secure the connections... Now as far as putting the HC module inside - I got no issue soldering wires if necessary , but on first glance there seems to be very little headroom to insert the module. BUT they make bigger spacers and longer screws. From all this discussion - I find it peculiar that I just cannot identify if I have SMD pads or feed-thru without opening it up. But it really does not matter - it has to be opened anyway. . I suppose "open hardware" concept - with multiple clones has its "advantages". |
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Re: Any more "development " in bluetooth?
#bluetooth
On the newer -H boards (not H4, as DiSlord has shown) there is a simple set of 4 pads in a row with V+, Rx, Tx, and Gnd. This is eaxctly what's required to connect an HC-05/06/... Bluetooth module. Its easy to solder a 4 pin header to these. The pins fit through the pad holes. Old -H boards don't have these pads and that is where you would have seen the "solder a wire here and ...". "older" is back 2+ years ago so there is fair chance you have a new enough nano to have these pads.
On mine I cut a small hole in the case above these pins Connections can be made using "Dupont" wires, or I repurposed on old 4 pin CD/DVD audio cable from bygone years, or you can use a 4 contaact female header. or ... well options abound. I think the best option is, as Dragan suggests, to connect the dongle only when needed. You could put it in a small plastic box if you want or just leave it bare (or in a shrink wrap tube as many of these modules seem to be). Unfortunately, if that still seems too daunting I'm afraid you may be out of luck. This is simple enough to do and works well enough that it probably satisfies many who desire BT support. Its not an elegant solution but its OK and probably means that nano vendors have little incentive to add this as the market is small. Maybe someone could offer a case that allows for the BT module? Maybe even 3D printed? |
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Re: Antenna Queries de k3eui Barry prior to Nano VNA talk
Charlie N2MHS
I remember wbw a 100 foot piece of -48V 500 MCM being modeled as R+jinductance and C to trough. We were wondering what impulse it would take to raise -48V to 0. Turned out a disgruntled employee was pulling the fuse. KISS
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On Wednesday, July 7, 2021, 12:56:52 PM EDT, David Eckhardt <davearea51a@...> wrote:
A DC source has no complex portion and is not characterized by impedance, only the real term in the R ¡À jX.? Further, if no current is drawn from the source, the presence of the R term isn''t there.? The ¡À jX term requires AC and is absent for DC.? However, once you draw a varying current from that DC source as in SSB or keyed RF (CW), then the complex portion appears. Example:? Take AWG #000 (or whatever) large solid copper conductor.? At DC, the cross sectional current density is homogenous.? However, even at 60 Hz, skin effect due to resistance and inductance (+ jX) is evident and measurable.? The cross sectional current density is no longer homogenous even at 60 Hz. Dave - W?LEV On Tue, Jul 6, 2021 at 9:53 PM Jim Lux <jim@...> wrote: On 7/6/21 8:46 PM, Anne Ranch wrote:--My favorite question , not directly related to nanoVNAantenna. *Dave - W?LEV* *Just Let Darwin Work* |
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Re: Any more "development " in bluetooth?
#bluetooth
I did just that on my 2.8" nano but a better idea is
to add a header and connect the BT dongle when needed. On Wed, 7 Jul 2021 at 19:00, Torbj?rn Toreson <torbjorn.toreson@...> wrote: Hello Dislord, |
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Re: Any more "development " in bluetooth?
#bluetooth
Hello Dislord,
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Is it possible to install the HC-05 or HC-06 bent down inside the NanoVNA H4-casing? Or will that disturb the Nano? 73/SM6AYM 7 juli 2021 kl. 18:13 skrev DiSlord <dislordlive@...>: |
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Re: Antenna Queries de k3eui Barry prior to Nano VNA talk
A DC source has no complex portion and is not characterized by impedance,
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only the real term in the R ¡À jX. Further, if no current is drawn from the source, the presence of the R term isn''t there. The ¡À jX term requires AC and is absent for DC. However, once you draw a varying current from that DC source as in SSB or keyed RF (CW), then the complex portion appears. Example: Take AWG #000 (or whatever) large solid copper conductor. At DC, the cross sectional current density is homogenous. However, even at 60 Hz, skin effect due to resistance and inductance (+ jX) is evident and measurable. The cross sectional current density is no longer homogenous even at 60 Hz. Dave - W?LEV On Tue, Jul 6, 2021 at 9:53 PM Jim Lux <jim@...> wrote:
On 7/6/21 8:46 PM, Anne Ranch wrote:My favorite question , not directly related to nanoVNAantenna. --
*Dave - W?LEV* *Just Let Darwin Work* |
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Re: Any more "development " in bluetooth?
#bluetooth
NanoVNA-H/H4 contain free pins named as Rx and Tx (you can see pcb or scheme)
Exist connection modules like HC-05 or HC-06 It allow easy connect any device vs UART port over Bluetooth, device need only receive commands from UART port and answer to it Need only configure module and connect to PC, and use any software as on USB connection |
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Re: Any more "development " in bluetooth?
#bluetooth
Anne Ranch
Pardon my ignorance
I assume yours is software only solution. ( I did not read your posts in detail - so forgive me if it is there ) I see few posts "solder wire to ...." and I would prefer NOT to do that. I do have HC-06 somewhere... So to be idiotic - I now know I have nanoVNA-H and I can use dfu-util... What other info do I need to check first and then upgrade my firmware? BTW I did try "hold the multipurpose whee down then switch the power on" Same result flash of white screen then flash of logo then the screen goes crazy PS have been told l to search the forum , but I prefer most recent " been there , done that " interactions. With that said the hardware has USB connection to outside world functioning as "serial connection" now where do all these other therms come from ? TTL (transistor transistor logic ) ? UART (universal asynchronous RX TX ) that all looks as hardware "hackers" terminology, but I thought this is primarily a users group. |
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full 2 port measurements
I was thinking about how to make full two port measurements.? The easy way is to get a coax transfer switch.? But given how cheap the NanoVNA is (i.e. less than the cost of the relay), what about just getting two NanoVNAs and hooking them up back to back with coax T's.? that is hook Ch0 on one to Ch1 on the other, etc.
As long as the frequencies happen not to be synchronized, they won't interfere (or you could stop one, measure with the other, then swap). The input Z should be consistent (it's a resistor bridge or pad in both cases) and it would "calibrate out" |
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Re: Any more "development " in bluetooth?
#bluetooth
You can use my firmware, it allow connect to PC over any Serial TTL module
HC-05 or HC-06 Or use any WiFi to TTL Search this forum for more info |
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Any more "development " in bluetooth?
#bluetooth
Anne Ranch
When I joined this forum - abut a year or so ago - I also started
my CAT bluetooth project. Hence I asked few questions about if there are any plans to add bluetooth to nanoVNA. I actually went as far as finding STM processor with build in bluetooth. Then it kind-of died. So - are there any news as far as implementing bluetooth - without modifying the existing hardware ? |
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Re: DFU updating
#dfu
William Smith
It can be even twistier than that. Win10 re-enumerates every time you plug or unplug a device, any time you (re?)connect with RDP, any time any USB device goes to sleep or wakes up, and probably other events as well.
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This can play havoc with WSJT-x digital modes, because the audio port you were connected to, while it has the same name, is no longer connected, and needs to be disconnected and restarted. I wouldn't be surprised to learn that nanoVNA software has similar issues. 73, Willie N1JBJ On Jul 7, 2021, at 9:20 AM, Jim Lux <jim@...> wrote: |
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Re: DFU updating
#dfu
On 7/6/21 9:15 PM, Anne Ranch wrote:
Thanks, sure explains few things. When your PC boots it should re-enumerate all the USB devices. In Windows, you can force this in device manager (and there used to be a command line technique, as well, but I don't know if it exists in Win 10. It probably does, but some googling will be required to find it) The unit shows up as a com port and unless you're unlucky, you can probably figure out *which* com port by looking at the VID and PID of the USB device (or by unplugging and replugging, and seeing which com port disappears and reappears) As far as USB devices go, the NanoVNA has been pretty good. |
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Re: impedance test of a TV antenna, How do I adjust 50 ohm to 75 ohm
On Tue, Jul 6, 2021 at 09:10 AM, Jim Lux wrote:
Thanks for your reply. As I understood the question, the transformer was to be added as an aid for measurement. Yes, if it is part of the original setup, it would need to be included in the measurement and "rolled into the calibration.". Again, thank you, larry |
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Re: DFU updating
#dfu
Anne Ranch
Thanks, sure explains few things.
As I just posted elsewhere, I am ignorant about my toy version. ( And I am NOT taking it apart to find out... and I was just kidding about taking Polaroid of screen flash ) I am currently working on my version of bluetooth access to FT857 CAT and I am painfully aware how "screw up" any communication with PC can get. As far as USB - that is how it supposedly work - the USB device supposedly announce himself to the USB bus AFTER it gets thru its power-up. And if the USB bus , hence booting PC in this case, is not ready for it ...who knows what will happen next. In short - USB (standard) starts communication FROM USB device to whatever , not from whatever to USB device... Bluetooth is even messier. |
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