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Erik - thank you for the update. It has improved the spurs as I no longer see the two spurs at 533.725 MHz and 533.775 MHz. There is a new spur at 533.6416 MHz (using precise sweep accuracy, 200 Hz

We don't use natural logarithms (base e) for RF Power dB, we use those for certain things in maths, like everyone else. The easiest way to use dBm without the maths is to remember 10dB = 10x power

Good advice here: https://tinysa.org/wiki/pmwiki.php?n=Main.Transmitters John NU3E

Same size, picture scaling went wrong -- Designer of the tinySA For more info go to https://tinysa.org/wiki

Lutz, The purpose of the calibration? indeed to remove the jump in the signal when it switches to harmonic mode. A jump in the noise is unavoidable as the signal path loss increases due to harmonic

Thanks. I also saw some results at? EEBlog, https://www.eevblog.com/forum/rf-microwave/the-new-tinysa-ultra/ Not bad

Erik, thanks again. I do have one more question, regarding the harmonic mixing part above 5.34GHz. I used the NanoVNA's generator's third harmonic (of 1.78GHz) at around -40dBm to run the calibration

Quote from WiKi: * *HAM BANDS* enables the gray shading showing the location of the USA ham bands *

Great idea. That’s what they did with that feature on the SARK110.

There’s a picture of the various tinySAs on the wiki that implies that the Ultra+ is physically larger than the Ultra. If it is, what are its dimensions? I can’t find them in the specs.

Add a menu option to select the different ITU regions? 73 Stan KM4HQE

The Wiki says ‘USA ham bands’.

Of course.

Yes, installation of a 40 dB attenuator and starting with 5-watts or +37 dBm (yes, your math is correct), will yield +37 dBm minus 40 dB = -3 dBm or 0.0005 watts. The "safe" input level Eric states

OK, really quick... Your math is correct. +37dBm - 40dB= -3dBm To get to -25dBm --> you need +37 dBm - 62dB = -25 dBm 73, Geoff --> AB6BT

This all makes sense. So what I do not understand is how with a 5w transmitter - which (if my math is right) is 37dbm, a 40db attenuator gets you to the minimum -25dbm safety threshold for the

OK, I'll try: Your confusion may come from not understanding the dB and logarithms related to actual power. 1) The advantage in reasoning/thinking in dB space is that the dB, like logarithms, add

I've been reading the responses to my own thread on here and watching several YouTube videos and still feel like I do not have a good handle on the attenuation required. In the videos, I have seen

They are correct for ITU Region 1, which is expected since Erik lives in that region. We are in Region 2. Larry - AC8YE Sent with [Proton Mail](https://proton.me/mail/home) secure email.

50 - 54 for 6m, not 50.1 [email protected]> wrote: