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On 8/5/20 2:59 PM, WB2UAQ wrote:

Use a fiber optic link into the cubesat. I used one a few years ago to isolate a radio for field testing. Sorry that I can't remember much about it but it was not a big deal. We had some kind of fiber optic to USB device...one a the radio and one at the lap top. See no reason why this wouldn't work for the cubesat. 73, Pete

We use those at JPL for testing too.. Mostly to provide galvanic isolation.

Look for "Fiber USB Extender" and you'll get plenty of choices.

They're in the $100-200 range.

You'll also see "USB Active Optical Cables"

On 8/5/20 2:23 PM, CARL HUETHER wrote:

A preamp is often needed on low noise receiving only antennas for 160 and 80 since they are negative gain antennas with excellent SNR and directional performance.
The Waller Flag, for instance needs about 40-45 dB gain.
Carl

On 07/12/2020 5:27 PM OneOfEleven <cmoss296@...> wrote:

Trouble is, these pre-amps have a LOT of gain once you get as low as 50MHz, mine has an attenuator on it because of that, and it's only stage of amplification in the entire receiver system, which is RF from the antenna, through the pre-amp and filtering then straight into a 16-bit ADC running at 125MHz (FPGA SDR).

I would not use a pre-amp on HF with todays radios.

The OPA656 is a nice low noise operational amplifier to make a low noise preamplifier for lower frequencies. It will be hard to beat, except with a discrete JFET design such as that from Jefferts


The nice thing about the op amp is that it can have fairly decent high level signal handling.

Both of these can make a MF-HF LNA with a noise that's less than the galactic background for a short antenna (which is quite bright at 5MHz, if it weren't blocked by the ionosphere)

Use a fiber optic link into the cubesat. I used one a few years ago to isolate a radio for field testing. Sorry that I can't remember much about it but it was not a big deal. We had some kind of fiber optic to USB device...one a the radio and one at the lap top. See no reason why this wouldn't work for the cubesat. 73, Pete

A preamp is often needed on low noise receiving only antennas for 160 and 80 since they are negative gain antennas with excellent SNR and directional performance.
The Waller Flag, for instance needs about 40-45 dB gain.

Carl

Bom trabalho! :)

/

Nice job! :)

OneOfEleven
Allow me to change your software icon?
Thank you !!

I followed your plan to install nanovna-saver on an imac running high sierra 10.13.6. Installation ran with no errors but when I tried to run from terminal. got the following error (see attachment),
Will this version only run on catalina?

@ OneOffEleven? Please where can I find your PC program for NanoVVNA-H4 ?

Thanks

Jos

Op 5-8-2020 om 19:03 schreef OneOfEleven:

On Wed, Aug 5, 2020 at 01:44 PM, Igor Jobim wrote:

Is it possible to copy the information from the SD card to the computer using
nanovna.exe?
A new feature, I mean.

It could do yes as my firmware has the sd_list and sd_readfile commands enabled.

I'll look at adding it into the windows exe at some point.

Thank you RandMental!

I am a “normal user” and have failed to make saver function on three different machines and four operating systems. I have had lots of help but I’m too ignorant to put it to good use. For instance I have finally got saver to operate on one of my 32 bit windows 7 machine. However, I can’t get it to connect to my nanoVNA. Previous to the installation of saver I was able to get it to show up in device manager. Afterward, it ceased to do so. I saw an earlier post that dealt with this issue and I will pursue that later.

SUGGESTION! Could you guys start a user group for us “normal users”? It could include nanovna-users, NanoVNA-2, and tinysa. I went two days without checking my email and found over 250 emails in my inbox. You could post links to stable saver versions and methods to deal with common problems. Please develop a version for windows 7 on a 32 bit machine. I have at least four of them. Can I ship one to someone who knows how to do it?

Also I would be willing to test some of these versions. I am obviously a “normal user” and would be a good test. I have a 64 bit MacBook Pro with VMware fusion with Windows 7 Pro. I also have a 32 bit windows 7 pro and a desktop window 7 pro that I use regularly.

Thanks to all of you,

Joe

Joe Joncas WA7MHB
Lincoln County Radio Amateur Club
541-272-3207
joe1@...

On 8/4/20 3:25 AM, Piero Tognolatti wrote:

Hi,
is anyone able to implement a new feature in the nanoVNA menu?? I need to locate the nanoVNA inside a mokup of a cubesat to take S11 measurement for a while (10 minutes, for example). I cannot use have any cable running out from the satellite (to not disturb measurement), so I would like to set the nanoVNA in order to take and store measurements, for example a measurement every minute.

Have you got room for a RPi or Beaglebone? Use the USB interface and NanoVNA-Saver? Can you tolerate WiFi? you can use VNC to remotely operate it.

Dear @DiSLord, @OneOfEleven @Holger and others

May I suggest new topics with tag #stable and others with #development for your work? And the subject, aldough generic, should point the scope of the topic: "Nanovna-H and H4 Firmware , SD card, LSI and LSE" for example :)

This will help users like me who wants to take part in the testing to give feedback and prevent that too much good information (like how to use, new features, etc) is "lost" in so many user inputs and versions.


On Wed, Aug 5, 2020 at 10:05 AM, RandMental wrote:

Dear @DiSLord, @OneOfEleven @Holger and others

I thus want to urge that we pause chasing new features and higher performance,
and work together to release and test stable versions of the firmware and PC
programs. If we don't we risk losing the support of the many users that have
no interest in development and maximum performance, but just want a stable,
usable NanoVNA for their RF and antenna projects work.

Hello,

The images show nanoVNA-H4, and only Hugen produced the H4 variant, so I assume even if its a clone, its based on Hugen's production.

But at the description one can read Display: 2.8 inch TFT (320 x 240). And "Moligh doll" was never mentioned as "official" Hugen's seller/store.

Please check the seller details:

It seems its located in GUANG DONG , China.

Will you pay customs taxes?

On Wed, Aug 5, 2020 at 07:50 AM, igor-m wrote:

@Dislord: do you still consider the project open-source?

Not understand. All my code open on git you can use it.
Last stable code (96k mode and SD card support, and UI) also on github and open.

Or i must add on my github every my test option?

Or ... i should support code? But sorry for this need a lot of time, and this not my main work.

On Tue, 4 Aug 2020 12:25:34 +0200, you wrote:

Hi,

is anyone able to implement a new feature in the nanoVNA menu?? I need
to locate the nanoVNA inside a mokup of a cubesat to take S11
measurement for a while (10 minutes, for example). I cannot use have any
cable running out from the satellite (to not disturb measurement), so I
would like to set the nanoVNA in order to take and store measurements,
for example a measurement every minute.

Is it a dream? Is there anyone able to create this feature?

Best regards

Piero, I0KPT

The nanovna is there, just take one and hook it up.
where is the problem?

wabi

Hello dear hobby colleagues.

I would like to buy NanoVNA-H4 4" LCD Display 50KHz-1.5GHz and I found this
one on Amazon:



Please, I address you the following question: is this the original device,
or is it a clone?
Another ham-radio friend of mine advised me to buy from Alibaba.
What is your opinion?

Thank you!

--
.........................................................................
Cu respect / Mit freundlichem Gru? / Kind regards
Horia Morariu
Mobile phone: 0040761736413


73 de YO2MNE

Hi,

is anyone able to implement a new feature in the nanoVNA menu?? I need to locate the nanoVNA inside a mokup of a cubesat to take S11 measurement for a while (10 minutes, for example). I cannot use have any cable running out from the satellite (to not disturb measurement), so I would like to set the nanoVNA in order to take and store measurements, for example a measurement every minute.

Is it a dream? Is there anyone able to create this feature?

Best regards

Piero, I0KPT

@Dislord: do you still consider the project open-source?

I try see git history and write it.

When I started making fixes for the firmware, I didn't think about full code support. My fixes were added to Edy555's repository. After 0.8, he stopped following the project. For myself, I made corrections, but did not make releases. At the moment, I plan to bring it to 192k mode and make a stable release (I think that now I understand the reasons for the freezes, during the 768k tests I began to receive them more often, but with low BW no) and I think to reduce the frequency change rate.

Then maybe I will gradually finish the rest.

OneOfEleven
Is it possible to copy the information from the SD card to the computer using nanovna.exe?
A new feature, I mean.
Thank you.