5% over 100% is allowed for stations running one or more subcarriers. That means if a station has a 67kHZ subcarrier, 105% is the limit. If the station is running both 67 and 92kHZ subcarriers, 105% is still technically the limit.
MPXTool is made by Leif Claesson. Not made in china. And what is wrong with China for you?
You mean acceptable by the FCC, right?
Wherever made, these SDR devices/applications are made for hobbyists, not as a calibrated measurement tool to determine whether a broadcast station is operating legally or not. The ones made in China, in particular, cover a very wide range of frequencies/bands. When you try to cover that much real estate, the resolution and accuracy can vary significantly.
This is not i got on my own personal tests against commercial modulation monitors from famous brands on my country. MPXTool gives me extremely precise readings. 99% of the dedicated modulation monitors i've tested gave me extremely low sensitivity and VERY BAD peak-precision. with some being worse than 2ms. showing varying and different levels of modulation with different levels of loudness.
The thing is when people say they are completely off or it displays incorrect data, that are right for a quick sec. When you calibrate the rtl sdr then you get the correct readings. It’s like using mirrors on a car without adjusting them first and expecting you’d able to see objects around your car “correctly “.
That's great and all, but it's still just a toy.
NO, It's not a toy. a SDR can pass extremely precise RF data if you know what you're doing. you probably think you know everything. SDR RTL's can give extremely precise modulation metering. MPXTool holds against the most expensive modulation metering hardware on world. with Nautel variant costing hundreds of dollars and running on extremely high quality SDR hardware. stop spreading your stupid opinion about something you don't know on internet please!
It's a toy. And it's more than my opinion. Professionals use professional equipment that can properly measure to ensure stations are kept within government standards. Using toys like consumer grade SDR's are fun and educational for amateurs and hobbyists, but someone using them as a measuring tool for deviation, spectral, or occupied bandwidth compliance without being able to confirm it with proper test equipment and methodology, are being foolish. The Nautel tools are expensive for a reason.
We are not talking about digital television here. We are talking about modulation deviation measuring using SDR. I've done extensive tests with different types of professional modulation monitors. Every model gave me different problems. From VERY BAD receivers with very bad signal reception to extremely inaccurate readings. SDR gave me the most precise metering even with bad signal reception and multipath. You keep saying the same thing all over and over. YOU SAYING THAT SDR's are bad doesn't means nothing to the actual thing. (Site Administrator Note: Offensive ad hominem comments removed.)
Remember there's not only you on this planet. Everyone is working with several types of equipment. Stop saying SDRs are bad just because you think you know something about SDRs and their linearity.
Wow, pretty childish and defensive aren't we? What, next are you going to start calling me a poo-poo head too?
Ah, now you're questioning what I do with my time? So far, other than calling me names, you haven't shown you know much about this business. The only thing shown for sure are your insecurities.
