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)
People probably overestimate the importance of these specs. The antenna is also going to act like a filter, too. By the way, in have a shortwave radio and i can pick up a couple local AM broadcast stations on their second harmonic. Wirh a sensitive receiver, you will never avoid harmonic issues. The goal is more that your signal will be weak anough that any legit signal on that harmonic would overpower it
Yep. He overlooked the fact that on the LOW input the SA doesn't read above 350 MHz. But here it is 2 years later and for another $35 my TinySA Ultra conveniently uses a single input to read all frequency ranges and has a software feature that automatically reads and displays the levels of pretty much all significant harmonics. Time marches on.
@@johnwest7993 I noticed that in one of his other videos (can't remember which one, I've watched so many). I think it's the one where he's using the NanoVNA as a signal generator. He was puzzled by the fact he couldn't read above 299 MHz yet he never used the high connection port nor did he switch from low to high input. Hey everybody makes mistakes. tried it with mine, yup that was it. Since it's my first day with ANY SA I thought it was pretty cool I noticed it. I know, I know...don't break your arm patting yourself on the back. 😁
@@billellis3137, it's always easy for us to analyze after the fact. I use a Harbor Freight $5 multimeter so I don't blow up any of my Flukes doing something stupid. :)
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.
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.
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.
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!
@@IMSAIGuy Did you tried connecting it to a base antenna? Thank you. The only thing I dont like of them is the digital squelch instead of a knob, besides of that they are great and cheap.
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.
no. sensitivity requires the injection of a signal at very low levels -80dBm to -120dBm and the monitor of the audio output of the radio for distortion.
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.
@@marcelomigueldasilva7444 the nanovna is used to test to resonance frequency of the antenna by measuring the VSWR, a TinySA can be used to measure the amount of radiated power from an antenna but not accurately. When I design an antenna I use the nanovna
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)
People probably overestimate the importance of these specs. The antenna is also going to act like a filter, too. By the way, in have a shortwave radio and i can pick up a couple local AM broadcast stations on their second harmonic. Wirh a sensitive receiver, you will never avoid harmonic issues. The goal is more that your signal will be weak anough that any legit signal on that harmonic would overpower it
Yep. He overlooked the fact that on the LOW input the SA doesn't read above 350 MHz. But here it is 2 years later and for another $35 my TinySA Ultra conveniently uses a single input to read all frequency ranges and has a software feature that automatically reads and displays the levels of pretty much all significant harmonics. Time marches on.
@@johnwest7993 I noticed that in one of his other videos (can't remember which one, I've watched so many). I think it's the one where he's using the NanoVNA as a signal generator. He was puzzled by the fact he couldn't read above 299 MHz yet he never used the high connection port nor did he switch from low to high input. Hey everybody makes mistakes. tried it with mine, yup that was it. Since it's my first day with ANY SA I thought it was pretty cool I noticed it. I know, I know...don't break your arm patting yourself on the back. 😁
@@billellis3137, it's always easy for us to analyze after the fact. I use a Harbor Freight $5 multimeter so I don't blow up any of my Flukes doing something stupid. :)
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.
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.
Just a wild guess about the load at 100MHz, could it possibly be picking up local FM broadcast? TNX 4 the upload !
73 N8AUM
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!
I was little confused about the frequency read out on the top of the display; am I missing something here..!?
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.
th-cam.com/video/Sdb_cs13njk/w-d-xo.html
by the way, it was a dummy load with an RF tap. not an attenuator: th-cam.com/video/4sxPSJKPOs4/w-d-xo.html
I mean if it just didn't correlate with the signal injected into the load.
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!
Mine is great. I really like it. I've owned many yeasu and icom HTs and the Baofeng is the best I've had. $25
@@IMSAIGuy Did you tried connecting it to a base antenna? Thank you. The only thing I dont like of them is the digital squelch instead of a knob, besides of that they are great and cheap.
@@DavidLopez-bz4rj yes 2m j-pole
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.
4.5W does not look great
@@IMSAIGuy sorry I updated my comment like 4 times during your post.
I'll blame it on my 27yr old test gear and the TIny was never calibrated so can't trust it.
can you check sensitivity of the radio with tiny sa?
no. sensitivity requires the injection of a signal at very low levels -80dBm to -120dBm and the monitor of the audio output of the radio for distortion.
@@IMSAIGuy ok thanks
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.
Qual é o melhor dos dois?
depends on your needs,
@@IMSAIGuycalibrar antena
@@marcelomigueldasilva7444 the nanovna is for testing antennas
@@IMSAIGuyok, obrigado. Más o tinysa não é pra calibrar antena?
@@marcelomigueldasilva7444 the nanovna is used to test to resonance frequency of the antenna by measuring the VSWR, a TinySA can be used to measure the amount of radiated power from an antenna but not accurately. When I design an antenna I use the nanovna