Re: NANO VNA Part II by k3eui
A little shorter link ;-)
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Re: NanoVNA-H v3.4 High S21 noise above threshold frequency after updating to 1.2.14 FW by hugen79
Hi Garret, since the default output power and ADC gain parameters of the new version of the nanoVNA-H's firmware are optimized for V3.4 and above, there may be more noise on earlier versions of the nanoVNA, you can try DiSlord's firmware.
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NanoVNA-H v3.4 High S21 noise above threshold frequency after updating to 1.2.14 FW by hugen79
Hi Everyone. Just recently updated my NanoVNA-H 3.4 to the newest 1.2.14 SI FW by hugen79. Never had any issues with the unit since purchased in 2019ish until I updated FW so I'm assuming I have a configuration setting or something wrong. Attached is a photo of it's S21 behavior, it has a low noise floor up to it's set threshold frequency (it defaulted to 290mhz but the high noise will shift down if I reduce this value) This photo is taken after a full calibration and doesn't change if I terminate both ports into 50ohms either. Anyone have any ideas on why it's doing this?
Thank you,
Garret
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NANO VNA Part II by k3eui
What can you learn about an Antenna from a Nano VNA graph?
Reflection Coefficient?
Return Loss (dB)?
SWR - obviously
PHASE?
Smith Chart summary?
This is a Part II Nano VNA talk I gave to a British ham radio club (about one hour).
This Part II is the ¡°under the hood stuff¡± ( more math ) leading into Smith Charts and a definition of RESONANCE and the example of GRAMPY pushing GRANDKID on a swing - sort of like an end-fed dipole. How does grampy know ¡°when to push¡±? Grampy is the feed line.
I don¡¯t know why the link is so long.
The good stuff is at the end - and yes, there is a QUIZ.
de k3eui
,vid:UlXgZpgE6qk,st:0
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Re: updated and calibrated nanovna h4 yields incorrect swr readings
AliExpress quality may be compromised and I won't go that far. While working at Phillips Lab on KAFB in Albuquerque, we were even forbidden to use Pasternack connectors and adaptors. At times, it's worth sourcing only the expensive connectors and adaptors - there, at taxpayer's expense. But when it is tight, you know it! It's tight and doesn't "wiggle". Not so with cheap connectors and adaptors. One must "wiggle" and re-tighten the backshells using the cheapies multiple times to assure they are tight. Dave - W?LEV On Sun, Sep 10, 2023 at 5:08?PM Lester Veenstra via groups.io <m0ycm= [email protected]> wrote: I buy adapters in quantity on AliExpress with good results
For one or two I need quick, I go to Joel: therfc.com
Lester B Veenstra K1YCM M?YCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed
USNSG CTM1)
lester@...
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of KENT BRITAIN
Sent: Sunday, September 10, 2023 12:07 AM
To: [email protected]
Subject: Re: [nanovna-users] updated and calibrated nanovna h4 yields
incorrect swr readings
A coffee can??? I have a shoe box full on the bench and a bag that
once held a computer full for the antenna range.
Dave ..... time to get serious! Kent WA5VJB
PS Don't forget Type C, Type HN and of course DIN adapters as well! hihi
Woops SMB and SMC's to!
On Saturday, September 9, 2023 at 06:20:07 PM CDT, W0LEV <
davearea51a@...> wrote:
Problem with this kit is that there is only one of each! Most times, I
need several of several kinds.
ADVICE: An old sage at VHF/UHF gave me some excellent advice 50 years
ago. Get yourself a 4 or 5-lb. ground coffee can. When empty, don't pitch
it. Clean and dry well. When it is full of every connector under the sun,
MULTIPLE COPIES OF EACH, you've got enough adaptors. Even now, I run
short of N-male to BNC-female adaptors and my 4-lb. coffee can is
overflowing. Of course, above 600 MHz, it's only N-Type or SMA.
Dave - W?LEV
On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote:
I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's the
kit I assembled (links in case anyone wants to buy the same):
--
*Dave - W?LEV*
--
Dave - W?LEV
-- *Dave - W?LEV* -- Dave - W?LEV
|
Re: updated and calibrated nanovna h4 yields incorrect swr readings
I buy adapters in quantity on AliExpress with good results
For one or two I need quick, I go to Joel: therfc.com
Lester B Veenstra K1YCM M?YCM W8YCM 6Y6Y W8YCM/6Y 6Y8LV (Reformed USNSG CTM1)
lester@...
452 Stable Ln
Keyser WV 26726 USA
GPS: 39.336826 N 78.982287 W (Google)
GPS: 39.33682 N 78.9823741 W (GPSDO)
Telephones:
Home: +1-304-289-6057
US cell +1-304-790-9192
Jamaica cell: +1-876-456-8898
toggle quoted message
Show quoted text
-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of KENT BRITAIN Sent: Sunday, September 10, 2023 12:07 AM To: [email protected]Subject: Re: [nanovna-users] updated and calibrated nanovna h4 yields incorrect swr readings A coffee can??? I have a shoe box full on the bench and a bag that once held a computer full for the antenna range. Dave ..... time to get serious! Kent WA5VJB PS Don't forget Type C, Type HN and of course DIN adapters as well! hihi Woops SMB and SMC's to! On Saturday, September 9, 2023 at 06:20:07 PM CDT, W0LEV <davearea51a@...> wrote: Problem with this kit is that there is only one of each! Most times, I need several of several kinds. ADVICE: An old sage at VHF/UHF gave me some excellent advice 50 years ago. Get yourself a 4 or 5-lb. ground coffee can. When empty, don't pitch it. Clean and dry well. When it is full of every connector under the sun, MULTIPLE COPIES OF EACH, you've got enough adaptors. Even now, I run short of N-male to BNC-female adaptors and my 4-lb. coffee can is overflowing. Of course, above 600 MHz, it's only N-Type or SMA. Dave - W?LEV On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote: I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's the
kit I assembled (links in case anyone wants to buy the same):
-- *Dave - W?LEV* -- Dave - W?LEV
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Re: Can a Crystal be Tested With NANO VNA?
Man, that is some heavy stuff!
Justin B.
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Re: updated and calibrated nanovna h4 yields incorrect swr readings
One shoebox is not enough hi hi
My 2 cents
Dg9bfc sigi
Am 10.09.2023 11:41 schrieb "David Wilcox K8WPE via groups.io" <Djwilcox01@...>:
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Show quoted text
Dave,
Only a 4# coffee can? You can do better than that.? If you are in the
Midwest there was an electronics retail seller on TV who offered 5# of
coffee if he couldn¡¯t beat your best deal.
Remember when coffee came in 1# cans or bags?? Now they cheat you with
only 12 oz for an even higher price.
Dave K8WPE
David J. Wilcox¡¯s iPad
On Sep 10, 2023, at 12:07 AM, KENT BRITAIN <WA5VJB@...> wrote:
? A coffee can?????? I have a shoe box full on the bench and a bag that once held a computer full for the antenna range.
Dave ..... time to get serious!??? Kent WA5VJB
PS Don't forget Type C, Type HN and of course DIN adapters as well! hihi Woops?? SMB and SMC's to!
??? On Saturday, September 9, 2023 at 06:20:07 PM CDT, W0LEV <davearea51a@...> wrote:
Problem with this kit is that there is only one of each!? Most times, I
need several of several kinds.
ADVICE:? An old sage at VHF/UHF gave me some excellent advice 50 years
ago.? Get yourself a 4 or 5-lb. ground coffee can.? When empty, don't
pitch
it.? Clean and dry well.? When it is full of every connector under the sun,
MULTIPLE COPIES OF EACH, you've got enough adaptors.? Even now, I run
short of N-male to BNC-female adaptors and my 4-lb. coffee can is
overflowing.? Of course, above 600 MHz, it's only N-Type or SMA.
Dave - W?LEV
On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote:
I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's
the
kit I assembled (links in case anyone wants to buy the same):
--
*Dave - W?LEV*
--
Dave - W?LEV
|
Re: updated and calibrated nanovna h4 yields incorrect swr readings
Dave,
Only a 4# coffee can? You can do better than that. If you are in the Midwest there was an electronics retail seller on TV who offered 5# of coffee if he couldn¡¯t beat your best deal.
Remember when coffee came in 1# cans or bags? Now they cheat you with only 12 oz for an even higher price.
Dave K8WPE
David J. Wilcox¡¯s iPad
toggle quoted message
Show quoted text
On Sep 10, 2023, at 12:07 AM, KENT BRITAIN <WA5VJB@...> wrote:
? A coffee can??? I have a shoe box full on the bench and a bag that once held a computer full for the antenna range.
Dave ..... time to get serious! Kent WA5VJB
PS Don't forget Type C, Type HN and of course DIN adapters as well! hihi
Woops SMB and SMC's to!
On Saturday, September 9, 2023 at 06:20:07 PM CDT, W0LEV <davearea51a@...> wrote:
Problem with this kit is that there is only one of each! Most times, I
need several of several kinds.
ADVICE: An old sage at VHF/UHF gave me some excellent advice 50 years
ago. Get yourself a 4 or 5-lb. ground coffee can. When empty, don't pitch
it. Clean and dry well. When it is full of every connector under the sun,
MULTIPLE COPIES OF EACH, you've got enough adaptors. Even now, I run
short of N-male to BNC-female adaptors and my 4-lb. coffee can is
overflowing. Of course, above 600 MHz, it's only N-Type or SMA.
Dave - W?LEV
On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote:
I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's the
kit I assembled (links in case anyone wants to buy the same):
--
*Dave - W?LEV*
--
Dave - W?LEV
|
Re: updated and calibrated nanovna h4 yields incorrect swr readings
A coffee can???? ? I have a shoe box full on the bench and a bag that once held a computer full for the antenna range.
Dave ..... time to get serious!? ? Kent WA5VJB
PS Don't forget Type C, Type HN and of course DIN adapters as well! hihi
Woops? ?SMB and SMC's to!
toggle quoted message
Show quoted text
On Saturday, September 9, 2023 at 06:20:07 PM CDT, W0LEV <davearea51a@...> wrote: Problem with this kit is that there is only one of each!? Most times, I need several of several kinds. ADVICE:? An old sage at VHF/UHF gave me some excellent advice 50 years ago.? Get yourself a 4 or 5-lb. ground coffee can.? When empty, don't pitch it.? Clean and dry well.? When it is full of every connector under the sun, MULTIPLE COPIES OF EACH, you've got enough adaptors.? Even now, I run short of N-male to BNC-female adaptors and my 4-lb. coffee can is overflowing.? Of course, above 600 MHz, it's only N-Type or SMA. Dave - W?LEV On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote: I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's the
kit I assembled (links in case anyone wants to buy the same):
-- *Dave - W?LEV* -- Dave - W?LEV
|
No, 12k is IF used in measure. So not possible measure on this frequency or it harmonics
PS in H4 possible change IF in config-expert settings menu
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Re: updated and calibrated nanovna h4 yields incorrect swr readings
Just buy more than 1 set of adapters - there's plenty of room in the divider bins. 8-)
I've gotten too old and grumpy to use the coffee-can approach - when I dump it out I have to root around to find what I need, and since most of the adapters are roughly barrel-shaped, they try to run away. The only place I do the bin-o-stuff is my "miscellaneous hardware" bin where assorted oddball nuts & bolts go.
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Re: updated and calibrated nanovna h4 yields incorrect swr readings
Problem with this kit is that there is only one of each! Most times, I
need several of several kinds.
ADVICE: An old sage at VHF/UHF gave me some excellent advice 50 years
ago. Get yourself a 4 or 5-lb. ground coffee can. When empty, don't pitch
it. Clean and dry well. When it is full of every connector under the sun,
MULTIPLE COPIES OF EACH, you've got enough adaptors. Even now, I run
short of N-male to BNC-female adaptors and my 4-lb. coffee can is
overflowing. Of course, above 600 MHz, it's only N-Type or SMA.
Dave - W?LEV
toggle quoted message
Show quoted text
On Sat, Sep 9, 2023 at 11:08?PM Terri Kennedy <terri-io@...> wrote: I use Pasternack at work, where it makes sense to pay $40 for an
N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of
adapters (and I did) for less than a single Pasternack adapter. Here's the
kit I assembled (links in case anyone wants to buy the same):
-- *Dave - W?LEV*
--
Dave - W?LEV
|
Re: updated and calibrated nanovna h4 yields incorrect swr readings
I use Pasternack at work, where it makes sense to pay $40 for an N-to-LMR600 crimp connector.
For my hobby use that's impractical. I can assemble a whole bin of adapters (and I did) for less than a single Pasternack adapter. Here's the kit I assembled (links in case anyone wants to buy the same):
|
The subject line is longer than the message. .. .. ... .... .....
Dave - W?LEV
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On Sat, Sep 9, 2023 at 10:28?PM ±õ²õ³Ù±¹¨¢²Ô <erretrete@...> wrote: Where come from the 12 kHz noise?
Possible to filter?
-- *Dave - W?LEV*
--
Dave - W?LEV
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Where come from the 12 kHz noise?
Possible to filter?
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Thanks, I did some more checks: power supplies on the pins of the various devices were ok, clocks were also present (except the 32 kHz, I guess it's used maybe only for the RTC during power down?) but I saw there was practically no activity on any pin at power on.
Then I noticed that that the SDA line was stuck at 1 V instead of being at 3.3 V: the pull-up resistor was measured to be ok, so something was pulling that line low. I then compiled the DiSlord FW after commenting out the calls to i2c_transfer() for the Si/MS5351 and the AIC3204 and flashed the NanoVNA: lo and behold, the display was alive and showing the usual Smith chart. The device was anyway unresponsive, maybe waiting for data from the AIC3204.
So it seems that one of those two devices on the I2C bus likely died, how that could have happened I have no idea.
In hindsight, it seems a bit strange to me that the FW just hangs, without showing any error message anywhere, if the I2C communications fail.
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If DFU works the STM32 microcontroller is working (VDD and clock).
Check also the internal supply voltages +5V (U3 / pin 1) and AVDD (U10 / pin 5) - expect 3.3 V.
Check the output of the 26 MHz TCXO Y1 / pin 3 (with a Scope). Expect about 1 Vpp.
If this is ok, check the output of the clock chip U5 / pin 6, this should provide 8 MHz and about 3.3 Vpp. If thats ok the ADC should be working too.
Check the clocks on U5 / pin 9 and pin 10. Frequency depends on the settings and can be as high as ~300 MHz. Voltage is mostly 1 ... 3.5 Vpp.
Cheers - Stefan
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Re: Can a Crystal be Tested With NANO VNA?
Wow I'm impressed, what a website everything you wanted to know about testing crystals. Thank you Lex.
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Re: Can a Crystal be Tested With NANO VNA?
I have tested and sorted quite a few crystals using a specialy designd adapter for the NanoVNA.
See:
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Lex PH2LB
Barry K3EUI
David Wilcox K8WPE
Dave