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The noise measurement page is updated

The input power of the fundamental should be as low as possible to avoid the tinySA generating internal harmonics. But the fundamental should also be so strong the harmonics do not disappear into the noise.
In this example:?
you see that keeping the fundamental just below -25dBm (with 0dB attenuation, increase attenuation if you increase the level of the fundamental) gives the largest measurement range of observing harmonics.
The first example in this video:?
shows the measurement of a signal with harmonics where the fundamental is at -25dBm
A practical example of measuring the harmonics from an actual transmitter can be found here:?

hi purchased one of thease. spectrum annalyzers are new to me still learning. what would be the maximum input power for checking harmonics ?on the tinysa? if anyone could reply that be great thanks m6set 73...

On Tue, Sep 15, 2020 at 11:55 PM, Bonzo wrote:

For this method of NF measurement it is important that the noise contribution of the DUT is
dominant over the noise of the S.A. itself.

I will adapt the page to use two amplifiers, just like in the Keysight instructions.
With one amplifier I did not see the noise increase (unless I added the input resistive termination) so the calculation is wrong.

Hi Erik,

For this method of NF measurement it is important that the noise contribution of the DUT is
dominant over the noise of the S.A. itself.

One can easily check this in your example by powering off the amplifier. The measured noise level
should then significantly drop. Minimum 10 dB, better 20dB. Otherwise the S.A. adds too much noise
in this setup and the calculated result is wrong.

So this step should be added in the procedure.

On Tue, Sep 15, 2020 at 06:02 PM, Ham Radio wrote:

Erik:

On the TinySA flash page, when it boots, it says in bold letters “tinySA v0.3”

I assume this is the version of the boot loader?

Bernie,
? v0.3 is the production hardware revision.? The beta hardware revision was v0.2.

?- Herb

Erik:

On the TinySA flash page, when it boots, it says in bold letters “tinySA v0.3”

I assume this is the version of the boot loader?

--
73, Bernie, VE3FWF
(most typos in this message were generated by highly sophisticated auto-correction software)

Thanks. I'm confused about terminating the input with a resistor. This increases the noise considerably.
The rest seems ok

See this Keysight web page for procedure.

Gary
W9TD

Ah,

Unplug the tinySA, wait for the beep, plug in again, wait for the beep and try again.

tinySA.exe may hang in a hidden state waiting in deadlock

On Tue, Sep 15, 2020 at 08:56 AM, Martin wrote:

Data over Power line adaptor

Is terrible, my neighbours are using them. I had to put chockes over all the mains electricity cables where they enter my home, including the ground cable.

Remember you can do DISPLAY/STORAGE/STORE TRACE to save a trace short term and after that you can do a PRESET/STORE/STORE x to save the stored trace to flash so you can recall them any time you want.
You can extract them to a PC using the "frequencies" and "data 1" console commands

?

I have just found it works fine on my other Windows 10 PC. Same TinySA, same TinySA.exe. Odd.

Thanks for clarifying the build number. It happens to me too!

Hi All,

I thought you may be interested to see the Tiny SA in action when trying to trace some RF interference from a Data over Power line adaptor.

The Yellow trace shows the peak hold trace with notches in the data signal on Amateur bands clearly visible, the Red trace shows a real time scan, with the strong data bursts peaking >25dB above the ambient noise floor.




By connecting the Tiny SA to a small tuned loop antenna and walking around the local streets, I have been able to identify the property that is radiating this noise. The next step is to try and get the Data over Power line adaptor removed.

Regards,

Martin

Thank you Erik.

You have a truly remarkable product. ?TinySA is a game changer.

Every high school Science ?Department should purchase a TinySA. ?The product maturity is there now,

What a great teaching tool using TinySA.exe and a large monitor for teaching students electromagnetic waves, frequencies, FM & AM modulation and where various services reside on the RF spectrum.

--
73, Bernie, VE3FWF
(most typos in this message were generated by highly sophisticated auto-correction software)

Short answer: Yes,?
but it deserves a long answer.

I guess you started from power on. At least I can replicated if I start from power on.
Then activate the 10MHz cal output and send to low input.
Then you see the 10MHz with marker 1 and you click on MARKER OPS/CENTER
and you get picture one.
Now look carefully at the center frequency. you would hope it to be 10MHz but it is 9.688MHz instead.
The reason for this error (which is not an error but a limitation) is the number of measurement points used.
The 350MHz range split over 290 points equals 1.2MHz step per point. The accuracy for frequency measurement when in full low range is thus limited and that is why you get 9.688MHZ i.s.of 10MHz (which is 0.3MHz delta)

Erik,
? I noticed the following issue this morning:

? 1. 10MHz calibrator output connected to LOW input.
? 2.? Marker->Center places the 10MHz carrier in the center of the display.
? 3.? Frequency->Span 10MHz.? Expected 10MHz carrier to remain in the center of the display with 5 divisions on either side.? Instead observed the following:

? ? ? ? ? ? ?

? 4.? Another Marker->Center resulted in the expected display.

? ? ? ?? ? ??

? Is the above actually intentional behavior for the tinySA?

? - Herb