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NanoVNA WebApp USB question

 

I have downloaded the NanoVNA WebApp to my Samsung S8 which has a USB C connector.

I've read issues about USB C to USB C connection issues without the 5.1k pullup resistors so I want to get a USB-C to USB-A female OTP cable to use with the USC-A to USB-C cable supplied with my nanoVNA.

Are there any issues if a get a USB-C to USB-A 3.1 female OTP cable or should I get a USB-C to USB-A 2.0 female OTP cable ?

Thanks,

Mike N2MS
 

On Wed, Oct 16, 2019 at 08:53 PM, n2msqrp wrote:

I've read issues about USB C to USB C connection issues without the 5.1k
pullup resistors
Just small correction - pulldown 5k1 resistors on NanoVNA socket.
 

Just small correction - pulldown 5k1 resistors on NanoVNA
Haven't opened the case yet. Please, which form factor SM 5.1k resistors? Wish I had known this before I put that order in for SMA connectors at Digi-Key.... I hate paying ten bucks shipping for fifty cents-worth of parts.

--
Wes Will
N9KDY
 

Wes,

Thanks for the correction. I don;t knwo the location of the pulldown resistors but do don't plan on using a USB-C to USB-C cable.

Mike N2MS

On October 16, 2019 at 5:01 PM N9KDY <n9kdy@...> wrote:


Just small correction - pulldown 5k1 resistors on NanoVNA
Haven't opened the case yet. Please, which form factor SM 5.1k
resistors? Wish I had known this before I put that order in for SMA
connectors at Digi-Key.... I hate paying ten bucks shipping for fifty
cents-worth of parts.

--
Wes Will
N9KDY
 

Well, Wes, to be honest, I don't have plans to put those resistors into mine Nano,
because I don't posses any host with USB-C socket yet ;-)
But I just opened case and must say it would be a paramount task - socket pitch distance seems to be 0.5mm,
so resistors should be as small as possible. Together with appropriate soldering & vision equipment...
 

Jacon Zar wrote:
socket pitch distance seems to be 0.5mm,
so resistors should be as small as possible. T
I was kind of hoping for something like "0603" or "0402" - standard name for the sizes of passive components. I'll just open it up and have a look, thanks anyway.

--
Wes Will
N9KDY
 

C'mon Wes, you're a Ham!
Scavenge the parts from an old cellphone or dead radio.?
I use a hot air gun to loosen the parts.?
73... Larry



On Wed, 16 Oct 2019 at 5:01 PM, N9KDY<n9kdy@...> wrote: > Just small correction - pulldown 5k1 resistors on NanoVNA

Haven't opened the case yet.? Please, which form factor SM 5.1k
resistors?? Wish I had known this before I put that order in for SMA
connectors at Digi-Key....? I hate paying ten bucks shipping for fifty
cents-worth of parts.

--
Wes Will
N9KDY
 

Finally, an excuse to get one of these....

 

Well, what is wrong with making a dedicated cable by cutting it, use a small elongated perf board (or etched board? wiring it one to one with the resistors on the board and heat shrinking it all back together?

On 10/16/2019 6:38 PM, N9KDY wrote:
Jacon Zar wrote:
socket pitch distance seems to be 0.5mm,
so resistors should be as small as possible. T
I was kind of hoping for something like "0603" or "0402" - standard name for the sizes of passive components.? I'll just open it up and have a look, thanks anyway.
 

The newly released NanoVNA-H has added the 5.1K Type-C CC resistors, which is already installed if it have a "NanoVNA-H V3.3" tag on your PCB.

nanoVNA_app.jpg

 

On 10/16/19 4:13 PM, n2msqrp wrote:
I hate paying ten bucks shipping for fifty
cents-worth of parts.

Well if you can stand the wait, ten bucks (in total) could get you a (small) boat load assortment of

sma resistors in maybe 30 +/- values (prob. 10-20 each) from China. Might as well grab some caps, too.


BTW love that little 4.3'' microscope! For sma work I prefer my binocular regular optical, but in

a pinch that thing might come in handy!


Bill
 

Larry Rothman wrote:
I use a hot air gun to loosen the parts.
I have a full surface-mount hot-air soldering system with a reasonably accurate temperature control and a set of half-a-dozen or so tips of various diameters. Tooling is not the problem.

Actually seeing 0402 size parts well enough to stick them on a circuit board in the correct place, well, now that is a problem.

Old age is not for the weak or timid.

I had considered modding a cable. Might be worth a try, rather than destroying a mostly-working piece of decent kit trying to solder on something I can't see any longer.

--
Wes Will
N9KDY
 

Some people said that you can solder anything you see, so get a magnifying glass. I dont beliewe that is always true but maybe you can. Leave coffee out for a while and try. I can just use 0603 with my nose almost touching the PCB.
 

"NanoVNA-H V3.3" tag
A dedicated USB attachment,
stripped of display, battery, and switches
would be nicely light weight and efficient
 

Hugen,


If I order a NanoVNA-H today will it have the 5.1k Type-C CC resistors installed?


What is the link to your Nan0VNA-H site?


If someone does not have a NanoVNA with the resistors does this workaround when connecting to a USB Type-C port:


USB Type-C to USB Type-A Male cable (supplied with NanoVNA) to Type-A Female USB Type-C cable


Mike N2MS

On October 16, 2019 at 9:41 PM hugen@... mailto:hugen@... wrote:


The newly released NanoVNA-H has added the 5.1K Type-C CC resistors, which is already installed if it have a "NanoVNA-H V3.3" tag on your PCB.
W5DXP
 

From: sala nimi: Some people said that you can solder anything you see, so get a magnifying glass.
"Some people" have never experienced familial palsy.
 

Some people said that you can solder anything you see, so get a magnifying glass.
"Some people" have never experienced familial palsy.
"Some people" have good depth perception
 

can anyone show the circuit and photo where this 5.1k resistor should be installed. Is it possible to install it on NanoVNA-H pcb?
 

On Thu, Oct 17, 2019 at 11:45 AM, QRP RX wrote:


can anyone show the circuit and photo where this 5.1k resistor should be
installed. Is it possible to install it on NanoVNA-H pcb?
Have a look here:

You need to attach 5.1K resistors to ground from cc1 and cc2.

Scroll up the webpage to see the pins
 

Hi,

I used to work for a passive component manufacturer. Had a tiny experience
with 0402. Hearing aid manufacturer used an 0402 cap to stop GSM
interference. Soldered by hand under a magnifyer. Watched the assembly
ladies making it look easy. Me? No chance! I was in my twenties then and
I'm 51 now.

Later I saw 0201 and then 01005! Static charges made those samples stick to
the packaging.

Paul

On Thu, 17 Oct 2019, 15:53 W5DXP, <w5dxp@...> wrote:

From: sala nimi: Some people said that you can solder anything you see,
so get a magnifying glass.

"Some people" have never experienced familial palsy.

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