Re: First PCB pictures of the V2
OK, thanks.
Many devices use pin 4 of the microUSB connector as a switching line (ex: cellphones use it to switch to OTG when pin 4 is grounded).
Maybe you could use that to route serial to the connector if pin 4 is pulled hi or low?? Just a thought.
Thanks
Larry
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On Wednesday, December 18, 2019, 1:21:58 p.m. GMT-5, Gabriel Tenma White <owowowowo123@...> wrote:
Would have done that but there are only two free GPIOs and looking at the layout they are pretty much impossible to route out. I'll try to think of something maybe involving the USB connector.
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Re: First PCB pictures of the V2
Great news, Gabriel.
Would it be possible to have a serial interface option that you can select via an on-screen config command?
That way, end users could opt to use their own add-on serial to BT or serial to WiFi or serial to ?? interfaces.
Thanks,Larry
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On Wednesday, December 18, 2019, 12:54:43 p.m. GMT-5, Gabriel Tenma White <owowowowo123@...> wrote:
option to rotate screen 180 degrees: should be doable; I think the ILI9341 has a command to do that without flipping the data.
bluetooth: not yet, maybe V3 ;)
display size: base version will have a 2.8'' display. User can swap in a 3.2'' ILI9341 display (drop in replacement) or a 4'' ST7796S display (pending firmware support). We are likely going to offer a version with 4'' display, maybe a month or so after the release of the base version.
jog switch: it's already the same part number as the one used in the -F, just without the nipple installed. Using the jog switch is optional as all features can be accessed from the touch screen.
price: most likely similar to the -H, so around $60. I don't know where the $100 BOM cost rumor comes from but it's false, the BOM cost can't be anywhere near $100 if this is to retail for $60 ;) There aren't much development costs because OwOComm sponsored the initial R&D on condition that all designs be open sourced.
I've attached the uncalibrated load plot. The performance of the baluns deteriorate rapidly above 3GHz so this is going to be marketed as a 3GHz instrument rather than a 3.5GHz one. On this particular unit the nastiness starts at 3.4GHz.
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Re: First PCB pictures of the V2
option to rotate screen 180 degrees: should be doable; I think the ILI9341 has a command to do that without flipping the data.
bluetooth: not yet, maybe V3 ;)
display size: base version will have a 2.8'' display. User can swap in a 3.2'' ILI9341 display (drop in replacement) or a 4'' ST7796S display (pending firmware support). We are likely going to offer a version with 4'' display, maybe a month or so after the release of the base version.
jog switch: it's already the same part number as the one used in the -F, just without the nipple installed. Using the jog switch is optional as all features can be accessed from the touch screen.
price: most likely similar to the -H, so around $60. I don't know where the $100 BOM cost rumor comes from but it's false, the BOM cost can't be anywhere near $100 if this is to retail for $60 ;) There aren't much development costs because OwOComm sponsored the initial R&D on condition that all designs be open sourced.
I've attached the uncalibrated load plot. The performance of the baluns deteriorate rapidly above 3GHz so this is going to be marketed as a 3GHz instrument rather than a 3.5GHz one. On this particular unit the nastiness starts at 3.4GHz.
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Re: First PCB pictures of the V2
On Tue, Dec 17, 2019 at 06:32 AM, Gabriel Tenma White wrote:
Here are the final pre-production prototypes, and plots showing uncalibrated
and calibrated S21 floor
Gabriel, Seeing the uncalibrated phase performance till 3GHz and the S21 isolation level I have to congratulate you with this result. The phase performance is MUCH better then the 3GHz bridge you can buy on eBay. Is it possible to also show the uncalibrated s11 with a load connected to port 1 (CH0)? Any reason why you stop the scan at 3GHz? -- NanoVNA Wiki: /g/nanovna-users/wiki/homeNanoVNA Files: /g/nanovna-users/filesErik, PD0EK
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Re: First PCB pictures of the V2
On Wed, Dec 18, 2019 at 06:14 AM, Pierre Martel wrote:
got a price range for the unit?
====================================================================
Hugen or Gabriel posted previously that the design objectives included keeping BOM costs below $100 and compatibility with current software base. That would probably bring the initial retail price to about the same as the current 4.3" NanoVNA-F in order to re-coup developmental costs. You can expect the cost to drop after the inevitable wave of clones start to appear.
- Herb
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Hope the keyboard lived through the experience ;) I'm interested in a case as well. Cheers, Lyle NM6Y On Wed, 18 Dec 2019 06:19:40 +0000 "Les Brown" <les.m0lpb@...> wrote: Sorry, had to run and the keyboard hit the floor.
I have downloaded a basic design, and we can mod it as we like.
But as I keep saying, the cost will be min. For all Ham radio Lic. Holders.
73
Les M0LPB -- 73 NM6Y Bickley Consulting West Inc. "Black holes are where God is dividing by zero" -- 73? ?NM6Y Bickley Consulting West Inc. "Black holes are where God is dividing by zero"
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Any expensive proffesional instrument needs 30 warmup minutes. It is really ussual. Calibration has to be done after warmup too.
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Re: First PCB pictures of the V2
got a price range for the unit?
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Le mar. 17 d¨¦c. 2019 ¨¤ 20:20, n2msqrp <mstangelo@...> a ¨¦crit :
Thanks for the update.
Could you use a more robust switch like that on the NanoVNA-F?
Looking forward to getting a unit.
Mike N2MS
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Yes, I measured with NanoVNA Saver 0.2.0, so having the USB connected is a must. The battery actually was already fully charged at the beginning, so shouldn't be too much of a problem unless the charging process is not optimal.
I don't see any possibility to suppress charging when using NanoVNA Saver anyway, besides removing the LiPo if this is the problem. Is there any?
Thx,
Chris, OE1CGS
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Re: errors of "error" models
REF: 17 December 2019 - /g/nanovna-users/message/8335- Dear Gary: this is obviously another experiment by itself - the objective is to investigate the possibility of an openly edited paper - at least one - and the paper by itself constitutes a concrete knowledge target - needless to say how much interesting we find this scientific procedure - best regards, gin&pez@arg - ps: let us know, please, if it is easy enough for you to get the basic paper by Hackborn from a nearby Library -
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did you performed measurement with USB cable connected to NanoVNA? Try to disconnect USB cable to disable accumulator charging. It will eliminate such effect.
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Thanks Paul for your message, I will add you to the list and put a note on the group when I am ready in Jan. 2020. We can only but try. 73 ¨C All the best for the holidays to you and your family, talk in the new year. Les ¨C M0LPB Sent from Mail ( ) for Windows 10 *From:* Paul Sayer ( paulsayer123@... ) *Sent:* 18 December 2019 11:18 *To:* [email protected]*Subject:* Re: [nanovna-users] Cases I would be interested as well. Paul G0VKT
On Wed, 18 Dec 2019, 10:12 Les Brown, <les.m0lpb@...> wrote: Hi, As soon as we have a case for testing, I will put the information up on the group. Thanks for your reply, it is good to know that there is interest out there for the case. 73, all the best for the holidays, talk in the 2020 Les ¨C M0LPB Sent from Mail ( ) for Windows 10 *From:* davebb123456 via Groups.Io ( david.browne7@... ) *Sent:* 18 December 2019 07:06 *To:* [email protected] *Subject:* Re: [nanovna-users] Cases Hi Les I would like a case, let me know when you get some done, Thanks Dave Browne 2E0DMB On 18 Dec 2019 6:19 am, Les Brown <les.m0lpb@...> wrote:
Sorry, had to run and the keyboard hit the floor.
I have downloaded a basic design, and we can mod it as we like.
But as I keep saying, the cost will be min. For all Ham radio Lic.
Holders.
73
Les M0LPB
Sent from Mail ( ) for
Windows 10
*From:* Les Brown ( lesdbrown@... )
*Sent:* 18 December 2019 05:20
*To:* [email protected]
*Subject:* Re: [nanovna-users] Cases
Hi, All
I have downloaded a basic design, this is
eh1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111llllllllllllllllllllllllllllllllllllllllllllllllllllllllsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Hi, All
I have downloaded the basic design from this link:-
This design looks OK, but I need to put it up on to the 3D printer to
find out if any problems.
Regards Price - this will be base of our case and if any mods needed, we
can look at it from there.
All cases made by me from home, will be at cost of material plus P&P were
needed, and that is it to all Ham Radio Lic. holders. It might not be
good business, but I am not in to making money from friends.
Yours
Les - M0LPB
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I would be interested as well.
Paul G0VKT
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On Wed, 18 Dec 2019, 10:12 Les Brown, <les.m0lpb@...> wrote: Hi,
As soon as we have a case for testing, I will put the information up on
the group.
Thanks for your reply, it is good to know that there is interest out there
for the case.
73, all the best for the holidays, talk in the 2020
Les ¨C M0LPB
Sent from Mail ( ) for
Windows 10
*From:* davebb123456 via Groups.Io ( david.browne7@...
)
*Sent:* 18 December 2019 07:06
*To:* [email protected]
*Subject:* Re: [nanovna-users] Cases
Hi Les
I would like a case, let me know when you get some done,
Thanks Dave Browne 2E0DMB
On 18 Dec 2019 6:19 am, Les Brown <les.m0lpb@...> wrote:
Sorry, had to run and the keyboard hit the floor. I have downloaded a basic design, and we can mod it as we like. But as I keep saying, the cost will be min. For all Ham radio Lic. Holders. 73 Les M0LPB Sent from Mail ( ) for Windows 10 *From:* Les Brown ( lesdbrown@... ) *Sent:* 18 December 2019 05:20 *To:* [email protected] *Subject:* Re: [nanovna-users] Cases Hi, All I have downloaded a basic design, this is eh1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111llllllllllllllllllllllllllllllllllllllllllllllllllllllllsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Hi, All I have downloaded the basic design from this link:- This design looks OK, but I need to put it up on to the 3D printer to find
out if any problems. Regards Price - this will be base of our case and if any mods needed, we can look at it from there. All cases made by me from home, will be at cost of material plus P&P were needed, and that is it to all Ham Radio Lic. holders. It might not be good
business, but I am not in to making money from friends. Yours Les - M0LPB
|
Recently, I measured a 30 m loading coil for a short vertical antenna with my NanoVNA. I powered the VNA, calibrated for a span from 9 MHz zu 11 MHz with Nano VNA Saver 0.2.0 and started measuring (average 9/4) S11 (R+jX and Q). Repeating the scan, I found R slightly higher, but X beeing the same as before. So I measured again, with the same effect: R drifts higher, X stays the same.
Continually running scans, a pattern evolved. Checking the attached figure, it is clearly observable that R increased for about half an hour before the measured value stabilizes. X however is stable, right from the beginning.
I stopped the scans after 37 minutes, when I had the feeling that it leveled out. After re-calibrating I measured again. It came as no surprise, that the NanoVNA continued to measure the same number for X. However, R was down (even a touch lower) to the value which I measured at the very beginning. But now it stayed at that number.
My conclusion is, that there is a thermal effect during the warming up of the NanoVNA. Once the device has operating temperature this drift disappears. For whatever reason this seems to effect low |Z| (in my case around 1 Ohm for the real part of the impedance) to a much higher degree than higher values. I assume, this effect is lowest for |Z| around 50 Ohm.
If you are aiming for high precision, especially at low |Z|, my advise is to let the NanoVNA warm up for about half an hour, and only than calibrate and start to measure.
Has anybody encountered anything similar?
Vy 73,
Chris, OE1CGS
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Hi, As soon as we have a case for testing, I will put the information up on the group. Thanks for your reply, it is good to know that there is interest out there for the case. 73, all the best for the holidays, talk in the 2020 Les ¨C M0LPB Sent from Mail ( ) for Windows 10 *From:* davebb123456 via Groups.Io ( david.browne7@... ) *Sent:* 18 December 2019 07:06 *To:* [email protected]*Subject:* Re: [nanovna-users] Cases Hi Les I would like a case, let me know when you get some done, Thanks Dave Browne 2E0DMB
On 18 Dec 2019 6:19 am, Les Brown <les.m0lpb@...> wrote: Sorry, had to run and the keyboard hit the floor. I have downloaded a basic design, and we can mod it as we like. But as I keep saying, the cost will be min. For all Ham radio Lic. Holders. 73 Les M0LPB Sent from Mail ( ) for Windows 10 *From:* Les Brown ( lesdbrown@... ) *Sent:* 18 December 2019 05:20 *To:* [email protected] *Subject:* Re: [nanovna-users] Cases Hi, All I have downloaded a basic design, this is eh1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111llllllllllllllllllllllllllllllllllllllllllllllllllllllllsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss Hi, All I have downloaded the basic design from this link:- This design looks OK, but I need to put it up on to the 3D printer to find out if any problems. Regards Price - this will be base of our case and if any mods needed, we can look at it from there. All cases made by me from home, will be at cost of material plus P&P were needed, and that is it to all Ham Radio Lic. holders. It might not be good business, but I am not in to making money from friends. Yours Les - M0LPB
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Hugen was aware of complaints about the quality of the coaxial cables being supplied by clone manufacturers and tried to address some of the issues with the new NanoVNA-H version (see following discussion, loosely quoted):
" ¡ Hugen-10-10-2019
The newly released NanoVNA-H reduced the RG174 cable from 30cm to 20cm to reduce the loss. If I make a VNA with a frequency higher than 1GHz, I will use the RG316 cable. On large VNAs in the lab, it is common to use RG402 cables.
This is the cable parameter provided by China's cable manufacturer£º ,,,"
At the very least, because the cable manufacturer is sourced, you can rest easier than having a no-name cable. I still like to check for mechanical stability by doing a "wiggle" test while observing the screen for stable measurements. My NanoVNA-H cables have been fine for my purposes. Your mileage, so to speak, may vary.
- Herb
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Re: NanoVNA Saver software version 0.2.1 TDR operation
Thanks Herb. That will help a lot with my understanding.
*Clyde K. Spencer*
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On Wed, Dec 18, 2019 at 3:15 AM Rune Broberg <mihtjel@...> wrote: Hello Herb,
thank you for answering this! :-) You're absolutely right.
The impedance steps are only shown in one direction, though: Going up. I've
yet to figure out quite *why*, but I am looking into it.
--
Rune / 5Q5R
On Wed, 18 Dec 2019 at 02:17, hwalker <herbwalker2476@...> wrote:
On Sat, Dec 7, 2019 at 09:06 PM, Clyde Spencer wrote:
In the TDR display there are two traces, One Red and one blue. I
understand the red but not the blue. Would some please give me an
explanation of the blue trace?
===========================================================================
You can think of the red trace as equivalent to selecting
<DISPLAY-TRANSFORM-LOW PASS IMPULSE> on the NanoVNA. Where the peaks are
indicative of time and distance.
The blue trace can be thought of as being equivalent to selecting
<DISPLAY-TRANSFORM-LOW PASS STEP> on the NanoVNA. Where levels are
indicative of impedance variations (see attachment).
- Herb
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Re: NanoVNA Saver software version 0.2.1 TDR operation
Hello Herb,
thank you for answering this! :-) You're absolutely right.
The impedance steps are only shown in one direction, though: Going up. I've
yet to figure out quite *why*, but I am looking into it.
--
Rune / 5Q5R
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On Wed, 18 Dec 2019 at 02:17, hwalker <herbwalker2476@...> wrote: On Sat, Dec 7, 2019 at 09:06 PM, Clyde Spencer wrote:
In the TDR display there are two traces, One Red and one blue. I
understand the red but not the blue. Would some please give me an
explanation of the blue trace?
===========================================================================
You can think of the red trace as equivalent to selecting
<DISPLAY-TRANSFORM-LOW PASS IMPULSE> on the NanoVNA. Where the peaks are
indicative of time and distance.
The blue trace can be thought of as being equivalent to selecting
<DISPLAY-TRANSFORM-LOW PASS STEP> on the NanoVNA. Where levels are
indicative of impedance variations (see attachment).
- Herb
|
Re: Increasing measurement range (ohms) ?
On Mon, Dec 16, 2019 at 03:25 PM, <roncraig1@...> wrote:
where the original NanoVNA runs directly from 5v USB that drops to LiIon
battery voltage when USB supply ls not connected.
That's wrong assumption. The Injoinic IP53xx chips are working as step-up converters when powered from LiPo, so it's always 5V on mixers.
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Hi Les
I would like a case, let me know when you get some done,
Thanks Dave Browne 2E0DMB
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Show quoted text
On 18 Dec 2019 6:19 am, Les Brown <les.m0lpb@...> wrote:
Sorry, had to run and the keyboard hit the floor.
I have downloaded a basic design, and we can mod it as we like.
But as I keep saying, the cost will be min. For all Ham radio Lic.
Holders.
73
Les M0LPB
Sent from Mail ( ) for
Windows 10
*From:* Les Brown ( lesdbrown@... )
*Sent:* 18 December 2019 05:20
*To:* [email protected]
*Subject:* Re: [nanovna-users] Cases
Hi, All
I have downloaded a basic design, this is
eh1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111llllllllllllllllllllllllllllllllllllllllllllllllllllllllsssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
Hi, All
I have downloaded the basic design from this link:-
This design looks OK, but I need to put it up on to the 3D printer to find
out if any problems.
Regards Price - this will be base of our case and if any mods needed, we
can look at it from there.
All cases made by me from home, will be at cost of material plus P&P were
needed, and that is it to all Ham Radio Lic. holders. It might not be good
business, but I am not in to making money from friends.
Yours
Les - M0LPB
|
OwO
Lyle Bickley
Juan Pablo EA4CIV
gin&pez@arg
Les Brown
