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Dear Eric, and all Tinysa users,

There have been a number of utube videos now, which show poor performance attributes of the device, without the creators fully understanding it. Some video authors have later corrected their earlier observations.

Most problems seem to originate from the agc (automatic gain control) and the lna, as most “problems” are avoided if these are both disabled. Am I right in assuming the agc and lna switching in/out are done during a sweep? If the gain (and scale)?were adjusted only between sweeps (maybe after two sweeps), surely these problems would not occur. I was quite used to twiddling the attenuation knob of boatanchor spectrum analysers to prevent a collapse of the display due to input overload.

Rather than having to disable these two features, could we have an option for these features to only change the operation of the device between sweeps?

Steve L

?

As all has been explained I suggest we close this topic.

On Sat, Oct 10, 2020 at 04:14 AM, Alain wrote:

You can see that the current specification was (wrongly) labelled as "5V USB (500mA Max)".
...

?In my opinion, it should be mentioned on the TinySA website if not.

The tinysa is *correctly* labeled. Look at any electrical device, the label specifies the current that the device will pull from the circuit.?

Look at *any* appliance in your home, it will tell you either how many watts or how many amps the device will pull, not what kind of limit has to be put on the supply.

You could put the tinysa on a 5 volt 100 amp supply and it would be perfectly happy, that's just simple electrical knowledge.

You plug things into your wall outlets that are capable of supplying many amps of power continuously, and hundreds of amps for a split second before the circuit protection trips. But you can plug in your computer, or lamp, or toaster without a thought, because electricity does not work the way you seem to think it does.?

I would suggest you go back to the basics and try and understand what people are trying to tell you.?

There is *nothing* wrong with how the tinysa is labeled, nothing needs to be changed.

On Fri, Oct 9, 2020 at 04:05 PM, Alain wrote:

I've heard people having such troubles with their NanoVNA by using a USB power charger rated at 2 amps instead of the 1 A max as specified.
Just saying...

One can hear many *incorrect* things on the Internet, this is one of them.

Thanks Erik!

Got a nice capture of a low power FM broadcaster near me during a period of no audio modulation. You can clearly see the 19 KHz pilot signal modulation.

I see trace smoothing disappeared again.

73

-Jim
NU0C

On Sat, 10 Oct 2020 06:26:49 -0700
"Erik Kaashoek" <erik@...> wrote:

New tinySA-App release
Version v1.1.4.6

OneOfEleven has made many improvements in the nanoVNA-App and in this release I synchronized the tinySA-App with those improvements.
As there are so many changed/new functions I have not been able to test everything and due to some serious git struggles some tinySA specific functionality may have disappeared.
Do not delete your old tinySA-App but store it in a safe place before updating......

Thanks Alain
?Downloaded the latest version and it works as expected.
--
? 73
??? Bob? KD8CGH

Hi Erik,

The new version is a definite improvement.

Could I suggest that the graph frequency scale is shown along the bottom axis and the marker frequencies are shown along the top (swapped over).

Most of the time markers tend to be used to indicate amplitude peaks or perhaps -3dB down from peaks, so it's easier to read if the specific marker frequencies are shown at the top and the graticule calibration is shown at the bottom, as is the usual case with graphs.

Would it also be possible to add a peak hold to the graph function at some point please ? It saves having to watch the screen to capture occasional events.

Thanks again for all your hard work, it's very much appreciated.

Regards,

Martin

New tinySA-App release
Version v1.1.4.6

OneOfEleven has made many improvements in the nanoVNA-App and in this release I synchronized the tinySA-App with those improvements.
As there are so many changed/new functions I have not been able to test everything and due to some serious git struggles some tinySA specific functionality may have disappeared.
Do not delete your old tinySA-App but store it in a safe place before updating......

Hi Bob,
The app for windows is on this link page (exe file only).

It works well with my unit and it was easy to use?the markers facility via this app.
I don't know yet how to use the markers via the TinySA screen menu.
All the best
Al

On Sat, Oct 10, 2020 at 05:52 AM, OneOfEleven wrote:

Their should not be any "Add Marker-1" option in the mouse-right-click menu, I don't know where that has come from ?

Oops, typo. Should indeed be "Add marker"
and indeed, it works without aligning

Hi John,
Great feedback for the community - Thank you.
I did my first test this morning on my very advanced work bench (washing machine) and my waveform generator (a Siglent SDG 830). This low cost Siglent is capable to generate a modulated signal with a wave carrier - See picture.
I am using a 'capacitive' loop antenna (measured at ~160 pF with the 75ohms cable at 1 Mhz - old TV Yagi kit). It broadcasts the generator signal to the Tiny aerial supplied with the kit. The capacitive aerial is hanged above the?TinySA aerial on the washing machine. I know it sounds like a crazy test!
Note: I've tested the coax and the waveforme generator with the TinySA's aerial. As long you don't touch the coax with the aerial, the shield is doing the job.
The lowest transmit signal that I was able to broadcast with the Siglent is 30 mVpp (~21.2 mVrms). The TinySA is capable to pick up that modulated signal above the noise floor at ~-102dBm between my 10 and 20 Mhz test trial. I am sure I can zoom in but I got lost with the menu.
The frequency difference given between the Siglent and the TinySA is around +/- 1kHz and the yellow marker followed each incremental frequency increase from 10 MHz to 20 MHz within that tolerance. In my opinion, the TinySA works well.
At 14Mhz, the aerial impedance is ~ 71 ohms therefore the broadcast signal must be very low. I calculated it at ~ 6.33 microWatt but I might be wrong because you have the aerial lost and so on.? I am not a radio amateur yet.
All the best
Alain
PS: Don't forget your magnifier when you are working with the TinySA.

On Sat, Oct 10, 2020 at 01:42 PM, Erik Kaashoek wrote:

Move your mouse close to the peak you want the marker on till you see both the vertical and horizontal white lines appear.
Then right click "add marker"

You shouldn't need to do anything about aligning anything Erik, to add a marker anywhere on the graph all you need do is either double click inside the graph area (away from other markers) or right-mouse-click and select "Add Marker".

Their should not be any "Add Marker-1" option in the mouse-right-click menu, I don't know where that has come from ?

Can we look forward to a delta marker functionality soon? ;-)
--
John AE5X

Move your mouse close to the peak you want the marker on till you see both the vertical and horizontal white lines appear.
Then right click "add marker"

How do you add a marker in the app? If I right click I get a pop up menu where I can select "Add marker 1", but I can't seem to add a marker. I've tried left click, double click, shift click, ctrl click, alt click and no marker is set. All I do is mess up my range. I'm using version 1.0.7528.21513.
I haven't found any doc and the videos cover the TinySA well, but not the app.

I made some measurements of one of my QRP rigs over the past couple of days with an HP-8563A that we have at work, then made the same measurements at home with the tinySA. Very much impressed with the tinySA:



73,
--
John AE5X

On 2020-10-10, at 11:14, Alain <aggaslondon@...> wrote:

This is the reason of my post/enquiry as I was concerned to have an increase of current supply from ~2.5 W (USB2.0/5V/500mA) to ~4.5 W (USB3.0/5V/900mA).

I have a table that is 74 cm high and can carry 300 kg load.

If I put something on this table, it will be at 74 cm height above the floor, regardless of its weight (if it is not more than 300 kg).

If I put something on the table that is less than 300 kg (say, a pencil), that will not be magically crushed by a 300 kg weight just because the table can bear that. The table will just happily bear the lighter load.

74 cm = 5 V — that is the voltage you get from the power supply; the supply will do what it can to keep up this voltage, up to a current of 900 mA.
300 kg = 900 mA — that is the maximum current it can supply, but the supply doesn’t force that current, that’s just its rated load capacity.

Of course, this all applies to constant voltage (CV) power supplies.
All USB power supplies are constant voltage (5 V), as are most “regulated” supplies.
(I also have constant current (CC) power supplies; these are not useful as USB power supplies. Just as constant voltage power supplies have a maximum current they can supply, constant current power supplies have a maximum voltage, often called the “compliance voltage”. But you don’t have one of those; they are quite special animals. Lab power supplies are often CV up to a rated/set current, which they then keep like a CC power supply — irrelevant unless you exceed the set current.)

And then there are power supplies that are not properly regulated (like a table that sags when I put something on top), so the voltage/current curve is more complicated. Use regulated CV supplies only.
(Note that there are also bad power supplies that may not be on spec;
simply only ever use power supplies from reputable sources, if only for electrical safety.)

Grü?e, Carsten

The current drawn by the tinySA is 500mA max, or less if less is needed

Dear Gents,
I have attached a picture of the label of my TinySA. You can see that the current specification was (wrongly) labelled as "5V USB (500mA Max)".
This is the reason of my post/enquiry as I was concerned to have an increase of current supply from ~2.5 W (USB2.0/5V/500mA)?to ~4.5 W (USB3.0/5V/900mA).
Thank you Erik for this prompt clarification. In my opinion, it should be mentioned on the TinySA website if not.
All the best for now.
Alain