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This group will be used to provide support to tinySA users

First and foremost I wish you and Hugen health and success!

Looking forward to hear more about the miniSA.

Let us know how can we help and test it.

73 de Luís, CT2FZI

I hope you remember us little people when you become rich and famous :)
Can you share when you think the commercial version will be available?

Hi Erik,

Can this device be used to measure the output frequency of UHF RFID reader, e.g. Impinj R700 reader?

The RFID frequencies according to wikipedia are:


The microwave RFID frequencies are outside the tinySA frequency range but the others are all within.
I do not know your RFID reader output power/antenna and I do not know which antenna/connection you will be using with the tinySA
I tried with a small telescopic antenna connected to the tinySA and a mobile phone with NFC reader and the 13.56MHz signal was very visible
But when using high power industrial UHF devices you may have to be careful not to destroy the tinySA
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I had great success looking at microwave signals with a contraprion made from a
surplus tektronix mixer(1-8ghz), a broadband input using a 3db attenuator before the mixer a low noise amplifier with resistive termination after the mixer? setting the gain of the whole signal path to 1. Using a PLL that has 4 programmable output frequencies (Made in Ukraine) I can look at signals all the way up to 8+Ghz with the most used frequencies at the flip of a switch. It tracks the signal as seen on my commercial analyzer to within about a db +-.I lose about 10db overall dynamic range by putting the amp after the mixer but it was a lot easier than to find a wideband high IP3 preamp that was flat from 1-8gig.

John

John, this sounds like an interesting contraption to extend the frequency range.
(A contraption like in???;)

Can you show us a bit more detail how it looks and what rsults your contraption gives on the tinySA screen?
Or maybe you did already and can give give us a link ?

BenS

Hi Erik,

One user on FaceBook is asking folowing: "New to this group and just got the TinySA Ultra last week. I've noticed that if I'm in the Ultra mode and save my settings for sweeping between 2.4 and 2.5 GHz in one of the presets, the fact that it was in Ultra mode doesn't get saved in the preset! I have to manually set it to Ultra mode BEFORE choosing the stored preset that goes from 2.4 to 2.5 GHz or it just goes to the 800 MHz sweep range.

I can not replicate this.
What I do:
Reset
enable ultra
reset
set stop 3GHz
PRESET/STORE/preset 1
PRESET/LOAD STARTUP
reset
PRESET/LOAD 0MHz-3GHz
span is now correctly set to 0-3GHz


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Erik, I normally use it in ULTRA mode.

For this short test I set Start frq. at 2,0GHz, Stop frq. to 2,5GHz and stored it to PRESET Nr.1.?
Then unchecked ULTRA mode, SA goes down to 800MHz.?

Now if I load data from PRESET Nr.1 the SA loads properly, 3rd harmonic is enabled and the spectrum displayed is indeed on 2,5GHz. Only the check box in menu ULTRA MODE remains unchecked.?I think that's what this FB user had in mind. ?

Why ever uncheck ultra?
Ultra enable? is not part of a preset but part of the config data

Yes I know.

Thanks, I will forward your reply to him.

Why ever uncheck ultra?

To get more calibration points. I use in measurements for low frequency the none ultra mode with a special correction curve. In this way I can use all 20 correction points in the low frequency mode and get better measurements at the very low frequencies.
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Klaus, DL5KV

There are separate correction curves for low, low with lna, ultra, ultra with LNA. Below 800 MHz the low curves are used, above 800 MHz the Ultra curves.
I do not understand how disabling ultra will change that?

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Yes Erik, you are right. I thought at the beginning that the normal curve is used only in normal mode. But it is used in ultra mode, too. The only condition is, all frequencies in the scan range have to be under 800MHz.
But if we are in the teme: What is the direct mode? When this curve is used? I could never see a reaction to it.
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Klaus, DL5KV

When you get close to the IF frequency there is a possibility to have some spurs. Enabling direct in the config will solve this
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On Sat, Dec 31, 2022 at 08:34 AM, Klaus W?rner wrote:

The only condition is, all frequencies in the scan range have to be under 800MHz

This is not true

The part of the scan range that can use the normal mode will use the normal correction curve

The switching between the two modes using their own curve is automatic

This I can't confirm. In my tests the low correction curve was only used as the maximum frequency was lower than 800MHz.
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Klaus, DL5KV

On Sat, Dec 31, 2022 at 10:37 AM, Klaus W?rner wrote:

In my tests the low correction curve was only used as the maximum frequency was lower than 800MHz.

I will look into this
?
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Whenever the scan extends beyond 800MHz the transition to the Ultra mode (and usage of the ultra correction curve) is shifted to 700MHz.
This is done to avoid a jump in the noise floor at 800MHz
Could this explain what you are seeing?
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