Aldo, in your tutorial is said: Reading off the chart, we see the following values:... Would you please explain where these values are seen? Thanks!! -- I_B_Nbridgema
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Hi there,
Do you think a specific groups.io group would help?
I have created one already, as I am waiting for my unit, but I am not sure
if its impolite to mention it here.
*73 de Lu¨ªs, CT2FZI*
<>
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On Sun, 29 Mar 2020 at 17:42, hwalker <herbwalker2476@...> wrote: On Sat, Mar 28, 2020 at 09:53 PM, Gabriel Tenma White wrote:
I can confirm that currently the only way to exit USB mode is to toggle
the power switch. I'll look into adding a register to allow changing modes.
The USB interface always outputs raw, uncalibrated values, as is in the
user manual. The reason is the assumption that the PC software always has
superior calibration routines (e.g. supporting arbitrary cal kit
parameters) and it is far less error prone if you can't be confused whether
you are readin calibrated or uncalibrate values.
=============================================================
Gabriel,
Thanks for your response. I understand blanking the display while
NanoVNA-QT or similar programs are running to increase the speed of data
transfers. Plenty of commercial applications do the same thing. For small
scripts, where you just want to work with the trace data currently on the
display, it would really help if you could add a firmware command to
un-blank the display, and also a firmware command to transfer corrected
CH0 and CH1 data.
Do you know it the client, HCXQS group, plans on a support forum for
the S-A-A-2?
Regards,
- Herb
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Or an amazon drop box if one is not far away. They are all over the place. The local Rite Aid, Ralphs,? UPS Store and health food store all have them within two miles of me.
Eric KE6US
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On 3/29/2020 8:39 AM, jac hil wrote: The problem with P O Box is the battery in the VNA.
PO rules prohibit a lot of things that burn and record how the parcel was
shook in transit.
Amazon follows the rules, but some of the flighty others don't. Or you get
a VNA with out a battery.
Could suggest a friend to drop ship to
Good luck
On Sun, Mar 29, 2020, 11:33 AM <nanovnagroup@...> wrote:
OK I am trying to order it but turns out they don't send to US PO Box
addresses which in this case is my only practical option. Why in the world
would you put such a stupid restriction on this small sized purchase???
Unless this is being drop-shipped which I would not be surprised at all
give amazon's sales system where you never know from where you are really
getting your item from. This is why I hate amazon, and will wait for it to
turn up on ebay at a similar price and zero complications.
SORRY AURSINC: NO SALE TODAY.
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On Sat, Mar 28, 2020 at 09:53 PM, Gabriel Tenma White wrote:
I can confirm that currently the only way to exit USB mode is to toggle the power switch. I'll look into adding a register to allow changing modes.
The USB interface always outputs raw, uncalibrated values, as is in the user manual. The reason is the assumption that the PC software always has superior calibration routines (e.g. supporting arbitrary cal kit parameters) and it is far less error prone if you can't be confused whether you are readin calibrated or uncalibrate values.
=============================================================
Gabriel,
Thanks for your response. I understand blanking the display while NanoVNA-QT or similar programs are running to increase the speed of data transfers. Plenty of commercial applications do the same thing. For small scripts, where you just want to work with the trace data currently on the display, it would really help if you could add a firmware command to un-blank the display, and also a firmware command to transfer corrected CH0 and CH1 data.
Do you know it the client, HCXQS group, plans on a support forum for the S-A-A-2?
Regards,
- Herb
|
The problem with P O Box is the battery in the VNA.
PO rules prohibit a lot of things that burn and record how the parcel was
shook in transit.
Amazon follows the rules, but some of the flighty others don't. Or you get
a VNA with out a battery.
Could suggest a friend to drop ship to
Good luck
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On Sun, Mar 29, 2020, 11:33 AM <nanovnagroup@...> wrote: OK I am trying to order it but turns out they don't send to US PO Box
addresses which in this case is my only practical option. Why in the world
would you put such a stupid restriction on this small sized purchase???
Unless this is being drop-shipped which I would not be surprised at all
give amazon's sales system where you never know from where you are really
getting your item from. This is why I hate amazon, and will wait for it to
turn up on ebay at a similar price and zero complications.
SORRY AURSINC: NO SALE TODAY.
|
OK I am trying to order it but turns out they don't send to US PO Box addresses which in this case is my only practical option. Why in the world would you put such a stupid restriction on this small sized purchase??? Unless this is being drop-shipped which I would not be surprised at all give amazon's sales system where you never know from where you are really getting your item from. This is why I hate amazon, and will wait for it to turn up on ebay at a similar price and zero complications.
SORRY AURSINC: NO SALE TODAY.
|
Gabriel, What program did the team use to simulate the PCB with the various components? I want to simulate (initially) some lumped component (SMD L and C) filters till 1GHz on a double sided FR4 PCB and looking for a free tool with an acceptable learning curve. I found Ansoft Designer SV but that requires some study time. Can you recommend something? -- NanoVNA Wiki: /g/nanovna-users/wiki/homeNanoVNA Files: /g/nanovna-users/filesErik, PD0EK
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That sure makes for some mystery, Gabriel! Why do you use a pseudonym?
Randy
NC8U
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On Mar 28, 2020, at 9:53 PM, Gabriel Tenma White <OwOwOwOwO123@...> wrote:
btw the V2 team is not just me ;) I'm just the only one publicly talking about it and even then I don't use my real name ;)
I can confirm that currently the only way to exit USB mode is to toggle the power switch. I'll look into adding a register to allow changing modes.
The USB interface always outputs raw, uncalibrated values, as is in the user manual. The reason is the assumption that the PC software always has superior calibration routines (e.g. supporting arbitrary cal kit parameters) and it is far less error prone if you can't be confused whether you are reading calibrated or uncalibrate values.
The VNA logic in the firmware was written from scratch, and we haven't yet implemented calibration interpolation (it wasn't removed, just never implemented). Personally I've not had good experience with using interpolation on other VNAs that support it; I've found it to give wrong results every time unless you have an insanely high number of sweep points (1000). However if there is popular demand we can go and implement interpolation.
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Re: Analysing Input Impedance Matching Circuit for the NE602
I have now made up my NE602 mixer circuit on prototype board and have tested it again using 1 to 8 turn transformers and (as suggested by Roger above) 1 to 7 transformers.
The nanovna-saver images show that when attached to the NE602 the 1:7 turns ratio is very slightly better at 7.15MHz:
1:8 VSWR 1.885
1:7 VSWR 1.818
1:8 return loss -10.26dB
1:7 return loss -10.75dB
Looking at the spectrum analyser plots though it looks like the 1 to 8 transformers are slightly better for output gain and reducing the level of the closest intermodulation peaks to my IF frequency of 10MHz:
1:8 output with -30dB input is -15.18dB
1:7 output with -30dB input is -15.63dB
I think for now I am going to keep the 1 to 8 turns ratio as it gives a slightly higher output and the two closest intermodulation peaks to 10MHz are a little lower with this turns ratio but the difference for 8 vs 7 turns appears to be very small with a 7.15MHz RF input and 10MHz IF output.
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On Sat, Mar 28, 2020 at 10:49 PM, Joe Burkleo wrote:
One thing I have not seen in the spec's so far is what the output level is.
Have you measured that or do you know what it is?
If I remember correctly the original version was in the -10 dbm range.
==========================================================
Joe,
I haven't gotten around to measuring the output levels. I'm not sure how accurate my power meter is pass 1 GHz. If it helps these are the levels that Gabriel has annotated on her schematic.
IN to OUT transmission: ?10dB
IN to REFL (OUT shorted): ?30dB
IN to REFL (OUT open): ?30dB
Coupling factor: ?20dB
I not sure if the -10dB IN to OUT transmission is really dBm or actual loss through the directional coupler. Most directional couplers I've used have less than a dB through loss.
- Herb
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On 3/28/20 10:49 PM, Joe Burkleo wrote: One thing I have not seen in the spec's so far is what the output level is. ???? At lower frequencies, the NanoVNA 2.0 uses the same chip as the version 1, an Si5351.? So, the output level will probably be similar.? At higher frequencies it uses an ADF4350, which has a rated output power in the -4 to + 5 dBm range.? By the time that get through the various switches, the bridge, and so on, I'd expect it will also be in the same range as the version 1s.? I measured my NanoVNA-H at - 9 dBm the other day.
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Herb,
One thing I have not seen in the spec's so far is what the output level is.
Have you measured that or do you know what it is?
If I remember correctly the original version was in the -10 dbm range.
Thanks,
Joe - WA7JAW
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Missed the first batch, any idea when will it be avaiable in Tindie again? or is there any other place to buy it?
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btw the V2 team is not just me ;) I'm just the only one publicly talking about it and even then I don't use my real name ;)
I can confirm that currently the only way to exit USB mode is to toggle the power switch. I'll look into adding a register to allow changing modes.
The USB interface always outputs raw, uncalibrated values, as is in the user manual. The reason is the assumption that the PC software always has superior calibration routines (e.g. supporting arbitrary cal kit parameters) and it is far less error prone if you can't be confused whether you are reading calibrated or uncalibrate values.
The VNA logic in the firmware was written from scratch, and we haven't yet implemented calibration interpolation (it wasn't removed, just never implemented). Personally I've not had good experience with using interpolation on other VNAs that support it; I've found it to give wrong results every time unless you have an insanely high number of sweep points (1000). However if there is popular demand we can go and implement interpolation.
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A correction to my review of the S-A-A-2. In addition to NanoVNA-QT, erik's last MOD of TAPR v4.6 located at /g/nanovna-users/files/NanoVNA%20PC%20Software/TAPR%20VNA/VNAR4.6.zip . also, supports the S-A-A-2. For some reason my Windows 10 computer was missing a couple of dll's that I had to track down, but once installed TAPR ran fine. An operating manual for TAPR 4.6 is also located at /g/nanovna-users/files/NanoVNA%20PC%20Software/ . TAPR is currently the only software application that works across all NanoVNA variations. The S-A-A-2 also goes into USB Mode (white screen with message) when connected to TAPR and after exiting the program, you still have to cycle power on the S-A-A-2 to regain manual control of it. - Herb
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erik,
I've been trying to transfer some of my NanoVNA scripts over to the S-A-A-2, and although its communicating, I'm operating blind. Any remote commands to the S-A-A-2 cause the screen to go white with the a "NanoVNA V2_2 USB MODE" message. There doesn't seem to be a command for exiting the USB Mode and the S-A-A-2 stays in that mode even after closing the serial port and exiting a script. The only way I have been able to exit the USB Mode and get back to a normal screen is by cycling power to the S-A-A-2.
Have you been able to find a reset or change mode command while modifying TAPR? Cycling power is not elegant. Actually, exiting the NanoVNA-QT program leaves the S-A-A-2 in the same state, which, is not the way to treat the user. This doesn't seem like Gabriel's usual attention to detail. In this area I would score one for the NanoVNA. I left an issue report at the GitHub page.
It also looks like the S-A-A-2 does not transfer corrected data over USB. Any external program or script will need to apply its own correction data. I don't envy Rune's effort to port NanoVNA-saver to this device. The communications protocol is totally different from the NanoVNA. Even enumerating the serial port required code changes, at least on my windows PC.
Additionally, it appears Gabriel decided to enforce re-calibration if the user changes frequency range. No more interpolation allowed. That's probably a good thing, but will puzzle some prior NanoVNA user's.
- herb
- Herb
- Herb
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They're back in stock. I ordered one an hour ago - it'll be here Monday.
--
John AE5X
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$79.95
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On 3/28/20 08:19, nanovnagroup@... wrote: On Fri, Mar 27, 2020 at 04:10 PM, Gary Hale wrote:
This one is a newer version, NanoVNA-H:
As of 3/28 AURSINC at your link above seems to be out of stock. There is only one ebay seller offering Rev3.4 that I could find, but currently priced at $106.75 !!
What was the selling price at Amazon?
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I guess his DELETE button didn't work...
On Sat, Mar 28, 2020 at 2:37 PM, vaclav_sal via Groups.Io<vaclav_sal@...> wrote: As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly? technical forums.
Some of them amateur radio related, some not.
I will freely admit that I am not the best communicator when explaining my requests.
However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...
What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?
As a result, I will no longer monitor or contribute to this thread.
10-4
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As a very seldom poster here I cannot help to make the following comments,
"gained" from experience with few allegedly technical forums.
Some of them amateur radio related, some not.
I will freely admit that I am not the best communicator when explaining my requests.
However, I am always trying to be a simpleton, generally on kindergarten level .
Thus I believe I posted very basic and simple question, I even asked for no sermons...
What " we have now.. is failure to communicate " , and this thread has been simply
hijacked to advertise / discuss virtues of Smith chart etc etc.
Nothing wrong with posting educational stuff about Smith chart,
but could you do it in ANOTHER , more appropriate thread ?
As a result, I will no longer monitor or contribute to this thread.
10-4
|
Nbridgema
CT2FZI
Jim Allyn - N7JA
OwO
Dallas N4DDM