#592 Using the NanoVNA and TinySA with 50 ohm load to measure radio

Episode 592
Using the NanoVNA and the TinySA with my new 50ohm load. Putting it all to good use. The Baofeng radio is 4.5watts and the load does just fine and the RF tap is useful with the spectrum analyzer. My TinySA had a bad internal attenuator that was found after I shot this video. I have not yet been shipped a new unit.
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[robertcullipher]

To check for spurious, make sure to go to the High port and check the multiples of 146. The 3rd and 4th order harmonics for my baofeng and btech HT are horrible, but the LOW port only shows the 2nd order(which is also out of spec)

[robertcullipher]

Unfortunately, it’s not in spec. 97.307(e) says for that frequency it must be 60db below the fundamental, or 25uW, based on power(so 100 watts needs 60db down, 5 watts needs no more than 25uW) If that is a Baofeng (5W) then you need no more than 25uW, or about -53db. That being said, it’s so close that I doubt anyone will hunt you down for such a close margin.

[fernandocano]

can you check sensitivity of the radio with tiny sa?

[vidasvv]

Just a wild guess about the load at 100MHz, could it possibly be picking up local FM broadcast? TNX 4 the upload !
73 N8AUM

[bulldogbrower]

Finally somebody who can make that box dance. The company should pay you to demonstrate their product. By the way for modulation just press one of the front panel keys on the Baofeng.

[JohnUsp]

You said "dummy load", but I guess you did an "Attenuator" and seems your attenuator is -30dbm, right? I want to test HTs from 0.5W to 10W. How much DB attenuation do you recommend? 30, 40, 50 db? Thanks.

[SpinStar]

OMG! Pretty telling when you have a VNA clamped in a Pana-Vise, while I'm holding this single-triode vacuum tube in my hand!

[subramanianr]

I was little confused about the frequency read out on the top of the display; am I missing something here..!?

[subramanianr]

I mean if it just didn't correlate with the signal injected into the load.

[DavidLopez-bzrj]

Some Baofeng series suffer from being deaf when connected to external or base antennas. Maybe because they don't reject signals out of band.
Have you observed anything like this on yours?
Could a passband filter help with this? Thank you!

[gorba]

Good morning INSAI Guy! Congratulations on the video of the dynamic test of the load built by you, using NanoVNA and TinySA which are, in my opinion, the latest equipment with excellent cost benefit. Enlightening and inspiring video for those who like to work with RF.

[subramanianr]

Good morning. Thanks for posting this video on your homebrew RF sniffer with arbitrary attenuation.
I would rather prefer the term "sniffer" though the cold is connected to that of the dummy load rather than to call it a "tap".
These thick film Chinese resistors are somewhat good for Amateur radio operators and though they are mentioned to be good upto GHz, I was very much doubting that.
Here the way you have made the dummy load in a screened box with heat sink is all that anyone can do maximum in taking care to have the shortest leads. All in all its a good demonstration.

[bruceblosser]

On every baofeng radio i have ever checked, it has a very high output on the 3rd harmonic of 2 meters!