开云体育

Thank you, Bryan. I knew there had to be a option somewhere to delete or reset.

Bob, KN4HH

H version not have FPU and hardware DSP, and can lost samples in processing (very critical for phase) also have less flash size

This software - proof of concept for new device from Eric, and this concept work.

On 12/22/22 8:02 AM, Donald S Brant Jr wrote:

"Better" is in regards to the user's needs/mission. The Comet is a single-port instrument which does scalar (no phase information) reflection-only measurements. If all that the user is interested in are VSWR measurements ("I just want a number!") the Comet is quick and simple. The various nanoVNAs do two-port transmission and reflection measurements and are more versatile, but require more effort from the user in the form of setup and calibration to make a measurement. Either are a quantum leap beyond the old VSWR bridge in terms of convenience and accuracy.

And, in fact, to be comparable to the Comet (or MFJ or whatever), you don't have to recalibrate every time. Just calibrate once, store it in location zero, and you're done.
The electronics in the NanoVNA are no more or less likely to change than those in a SWR meter.

The Comet unit is not a VNA, Vector Network Analyzer, so any comparison is
inappropriate. However, if all you want to do is scalar match antennas and
the like, the Comet unit does not require a reasonable working knowledge of
complex impedances. Further, the VNA delivers multiple applications to
which the Comet can not address. Personally, I would not consider the
Comet for the price and limited capabilities as compared to the NANOVNAs.
But, as Donald wrote, it depends on your use model.

Dave - W?LEV

--
Dave - W?LEV

"Better" is in regards to the user's needs/mission. The Comet is a single-port instrument which does scalar (no phase information) reflection-only measurements. If all that the user is interested in are VSWR measurements ("I just want a number!") the Comet is quick and simple. The various nanoVNAs do two-port transmission and reflection measurements and are more versatile, but require more effort from the user in the form of setup and calibration to make a measurement. Either are a quantum leap beyond the old VSWR bridge in terms of convenience and accuracy.
73, Don N2VGU

On 12/21/22 10:27 PM, Erik Kaashoek wrote:

For those that want to do very accurate phase and frequency measurements, but are not willing or capable to buy a PhaseStation or Timepod, a new FW has been made available for the nanoVNA-H4 HW that converts it into a mix between a DMTD and PhaseStation.
Accuracy of phase measurements is better then 1e-12 / (Tau in seconds) and the device support sending the phase measurements over USB to programs like TimeLab or writing to an internal SD card for later analysis.
During testing and comparing to other frequency and phase measurement devices, the tinyPFA outperformed conventional frequency counters and delivered phase measurements identical to a PhaseStation when used above the noise floor.
A wiki containing all the information for creating and using your own tinyPFA can be found here:
A support forum is available in case you have questions regarding the operation of the tinyPFA or want to share results
As the FW is fairly new you can expect some bugs.
The nanoVNA-H4 HW does not have to be modified so after use as a tinyPFA, it can always be converted back into a VNA.

This is all very cool.

Do you have more info on the software you're loading into the NanoVNA? (I have a couple of the smaller screen versions).

On Thu, Dec 22, 2022 at 03:44 AM, David J Taylor wrote:

That rules out all the devices I have, then, unless the plain F might work!

No.

On my H4 I can reset saved profiles back to empty. Theres an advanced menu, then more, then reset option. I might be misquoting the menu names but its in there. This puts the vna back to factory config. I wipe mine all the time because I can never remember all the details of each memory and end up recalibrating anyway.

Cheers.
Bc

I have both. I consider the NanoVNA H4 to be the more sophisticated and versatile but delicate test instrument and the Comet CAA-500 Mark II to be the more rugged, comparatively.

If I am analyzing an antenna for more than just SWR, particularly a new base antenna, then the H4 is my choice. If I'm just checking SWR, particularly on a mobile antenna where I'm concerned about physically damaging the Nano and its connections, then the Comet is my first choice. I can manually sweep with the Comet for a quick and dirty eyeball check on bandwidth. I can do a sweep with the Nano and save the data for a more detailed and leisurely analysis later.

Both have their place in my suite of test instruments.

On 22/12/2022 11:19, Erik Kaashoek wrote:

Hi David,

This looks very interesting. Are there any plans to support other nanoVNA
class devices? Of course, the H4 is one I/don't/ have!

The design of the V2, Lite and Libre devices makes it impossible to use their HW in this way.
And the MCU of the original nanoVNA-H is not fast enough so I gave up on that one.

A pity that you can't use groups.io as I/hate/ "forums". I want e-mail in and
e-mail out, sigh! Yes, groups.io is [now] quite expensive. How about
time-nuts, or would Tom consider it inappropriate?

Has been discussed with Tom and I agree with him.
Giving support to a specific device does not fit with the time-nuts email list .
I considered a simple email list but the absence of spam prevention tools requires moderation of every posted message and that is not something I want to do.
Erik

Thanks, Erik.

That rules out all the devices I have, then, unless the plain F might work!

Noted on the support mechanism. I was thinking groups.io where you can easily moderate the first post, but the cost for a new group is prohibitive.

Cheers,
David
--
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Hi David,

This looks very interesting. Are there any plans to support other nanoVNA
class devices? Of course, the H4 is one I /don't/ have!

The design of the V2, Lite and Libre devices makes it impossible to use their HW in this way.
And the MCU of the original nanoVNA-H is not fast enough so I gave up on that one.

A pity that you can't use groups.io as I /hate/ "forums". I want e-mail in and
e-mail out, sigh! Yes, groups.io is [now] quite expensive. How about
time-nuts, or would Tom consider it inappropriate?

Has been discussed with Tom and I agree with him.
Giving support to a specific device does not fit with the time-nuts email list .
I considered a simple email list but the absence of spam prevention tools requires moderation of every posted message and that is not something I want to do.
Erik

On 22/12/2022 06:27, Erik Kaashoek wrote:

For those that want to do very accurate phase and frequency measurements, but are not willing or capable to buy a PhaseStation or Timepod, a new FW has been made available for the nanoVNA-H4 HW that converts it into a mix between a DMTD and PhaseStation.
Accuracy of phase measurements is better then 1e-12 / (Tau in seconds) and the device support sending the phase measurements over USB to programs like TimeLab or writing to an internal SD card for later analysis.
During testing and comparing to other frequency and phase measurement devices, the tinyPFA outperformed conventional frequency counters and delivered phase measurements identical to a PhaseStation when used above the noise floor.
A wiki containing all the information for creating and using your own tinyPFA can be found here:
A support forum is available in case you have questions regarding the operation of the tinyPFA or want to share results
As the FW is fairly new you can expect some bugs.
The nanoVNA-H4 HW does not have to be modified so after use as a tinyPFA, it can always be converted back into a VNA.

Erik,

This looks very interesting. Are there any plans to support other nanoVNA class devices? Of course, the H4 is one I /don't/ have!

A pity that you can't use groups.io as I /hate/ "forums". I want e-mail in and e-mail out, sigh! Yes, groups.io is [now] quite expensive. How about time-nuts, or would Tom consider it inappropriate?

Thanks for making this available.

Cheers,
David
--
SatSignal Software - Quality software for you
Web:
Email: david-taylor@...
Twitter: @gm8arv

Does the expensive Comet CAA-500... do anything more or better than a
nanoVNA?
I don't believe the Comet has software apps or PC connectivity

I couldn't find any comparison on the web or info by Comet that made the
Comet unit look better.


Chuck
K4TZO


--
Chuck Cole ?K4TZO

For those that want to do very accurate phase and frequency measurements, but are not willing or capable to buy a PhaseStation or Timepod, a new FW has been made available for the nanoVNA-H4 HW that converts it into a mix between a DMTD and PhaseStation.
Accuracy of phase measurements is better then 1e-12 / (Tau in seconds) and the device support sending the phase measurements over USB to programs like TimeLab or writing to an internal SD card for later analysis.

During testing and comparing to other frequency and phase measurement devices, the tinyPFA outperformed conventional frequency counters and delivered phase measurements identical to a PhaseStation when used above the noise floor.

A wiki containing all the information for creating and using your own tinyPFA can be found here:
A support forum is available in case you have questions regarding the operation of the tinyPFA or want to share results
As the FW is fairly new you can expect some bugs.

The nanoVNA-H4 HW does not have to be modified so after use as a tinyPFA, it can always be converted back into a VNA.

*Nano VNA graphs of a? 150 ft long wire antenna fed against ground with a
wide-range tuner in shack*













*Anyone up for a 160 meter digi mode QSO around 1850 kHz?*



*
*



I could try an FLDIGI mode (THOR, Olivia, MFSK)? or? VAR AC? with VARA HF
modem




Prop likely best on 1.85 MHz in the evening after sunset (7 -8 pm) or
early morning hours (7-9 am)














In an effort to get on the 160 meter band, I threw *150 ft* of wire into
trees all around my yard, about 20 ft above ground.



Fed with 50 ft RG213 coax thru a? RF choke with the shield grounded to an
8 ft ground rod.



Might try some counterpoise lengths later.




If it works, I'll try to get it up higher.









Wondered where it might work with and without a tuner in the shack.













I am using Nano VNA SAVER software and a 3 yr old Nano VNA - H4




Here is the RETURN LOSS (dB) and SWR? from 1 to 11 MHz with NO tuner




Looks like main resonant frequency is around 1.3 MHz all by itself













Here is same 150 ft long wire antenna, post wide-range antenna tuner in
shack.



I am trying to get a good match on the 160 meter band around *1850 kHz*



I can match this wire almost anywhere in the 160m band with the wide-range
manual tuner in the shack



















Here is the SMITH CHART for the 160 m band post antenna tuner in shack




Center of chart (Bull's Eye) represents 50 ohm Resistance and 0 ohms
reactance for a 1:1 SWR



Remember these are the data received inside my shack , post tuner in my
shack, with antenna 50 ft down the coax

[error last data point at marker #6 is 1.90 MHz]

The PHASE graph also shows where the new resonance (in my shack) is
located around 1.85 MHz























Here it is post tuner trying to get a decent match on the 80m digi portion
of the band near 3580 kHz



This looks promising near my favorite part of the 80m digi portion of the
band: 3583 kHz














And finally, I wondered if I could get this to tune up on the 30m band,
around 10.1 MHz



I know I will have more loss in the coax on 10 MHz, but we'll see.


















So far the Nano VNA is doing well for me using Nano VNA SAVER 0.5.2
version









73



de k3eui Barry



West Chester PA

Hi Marco,

The cell is an 804050 (see below) which means it's 8mm thick, 40mm wide, and 50mm long @ 2000mah. I measured the thickness of the area and you should stay with exactly those sizes. The absolute thickness would have the first 2 numbers of 90 which is 90mm thick. Do NOT exceed that or you will be putting unnecessary pressure on the battery. Hope that helps.

Mike C. Sand Mtn GA

PS: Very easy to open and remove the entire ckt board, 4 each Phillips screws.

Glad that worked. Saver is calculating the center freq and 3dB rolloff
frequencies from the data, which will always be slightly different than the
design frequency.
After the analysis is complete (and no longer running), you can always
change the center marker to exactly 10.7 to show the measurements at that
frequency in your graphs, etc.

Sigi is correct - the only way you can save measurement data is if your
nano has an SD card slot and a version of firmware that supports it. Many
nanos are SD-ready; search for SD in the messages in this forum for details
- mine already had the SD card slot installed internally, just needed the
firmware and a craft knife to make a slot in the case. If your nano is set
up with the SD card for storage, you can:
a) save screenshots of your measurements, which you can then view on
your computer;
b) save the .s1p/.s2p sweep data files; which can be used with many
analysis apps to make customized graphs/displays of the data;
c) save your calibration data in files with names you select, so you can
easily retrieve them later for additional measurements.
Stan


On Wed, Dec 21, 2022 at 3:45 AM Siegfried Jackstien <
siegfried.jackstien@...> wrote:

He also wants to save the measurement... No that does not work.. Except
when you modded your unit with an sd card holder and use a fw that supports
it.
Dg9bfc sigi

Am 21.12.2022 05:30 schrieb "KK4ITX John via groups.io" <jleahy00=
[email protected]>:

Keith,

When you first setup the VNA you saved the Configuration probably in

Zero.

This calibration stays in the unit until it’s overwritten by another
calibration. If you save it while you’re outside, it should still be
available at the next powerup..

John
KK4ITX



Visit: www.zaarc.org. ?

On Dec 20, 2022, at 17:45, Keith Ostertag <n3kxz@...> wrote:

Using NanoVna V2 SAA-2N fw 1.1.00, and just starting to try to use

VNA-View 1.1 on Linux computer. Never used this software before.

Is there a way to save a calibration that I did with the nanovna not

attached to the computer? For example, I am outside and do a calibration
and measurement. I bring the nanovna inside later in order to save and
examine that calibration and measurement on the computer. I am not seeing
a way to do that. When I invoke VNA-View it (and instructions I've seen)
seems to want to calibrate using the computer interface, and I don't see

a

way to tell it to use what is already on the device.

The program does recognize the device. But does it recognize saved

calibrations and measurements that were made when the device was not
attached to the computer?

Thanks,
Keith
N3KXZ

That tidbit helped thank you. When I set marker 1 = 10.7, clear others, 1 changes to 10.9999 others to 9.2Mhz
I hit sweep, they change to: 1 = 10.729 2=10.628 3 = 10.830
Can i keep a marker at 10.7 exact or does it even matter since the measurements are coming out consistently now?

Kind Regards

I'm not sure (not at home with my nano to experiment), but try setting only
marker 1 at 10.7, clearing the other markers, and see if the auto analysis
runs with consistent results.
I'm wondering if the auto analysis is changing the markers as it searches
for the filter characteristics, and it's not expecting 3 markers to be set.
After the analysis completes, cancel it and set the two edge markers to
include them in your report.