Super clear thanks! Is there an advantage to perform IQ demodulation in FMCW since dechirping only creates by construction positive beat frequencies? Many thanks and cheers from France
The receiver block diagram presented @4:55 shows an ADC between the IF stage and the DDC block. I thought the output of an ADC was a binary value (composed of 1's and 0'S) that represented the level of the analog signal at the sampling time. How can such a binary representation of the signal level be used by the DDC? Thank you!
I have an on-again off-again project for a SDR based on a superegenerative front end. Phase information is typically obliterated but I plan on recovering it using the fact that the tank circuit stays locked in phase with the carrier. So I want to make a circuit that can recover the phase AND amplitude of the signal in IQ form, just like a normal SDR. The idea is to eliminate the ADC and also have tremendous dynamic range. Most of the SDRs I have made suffer from artifacts when front end is overloaded. So far I can decode things like 8-PSK, but I hope to make it work for signals in general.
Superregen is very difficult to keep stable, why do you want to use it? It made sense way back when every single tube was very expensive, as it saved components. Now that good RF amplifiers are cheap and perform well, why not use them?
Nobody ever explains" why do we want to do this, to generate I and Q signals?" HOW do we use these to eliminate a Sideband?? What is the complete process?
I like the explanation of the negative frequency. Haven't seen that so clear that far 😊
Wow, this was exactly what I was looking for, for the homodyne receivers.The reason behind why we use 2 orthogonal signals explained beautifully!
Finally, I think I understand ‘negative frequency’. Previously - my Q was ‘How can you have less than 0 oscilations per second ?’
Negative frequency is just a signal below the lo frequency
Super clear thanks! Is there an advantage to perform IQ demodulation in FMCW since dechirping only creates by construction positive beat frequencies?
Many thanks and cheers from France
@@martindegourcuff8854 I would say yes, by having iq demod, the amp and phase of the chirps are preserved and sampled
@@TheGmr140 thank you for your answer
The receiver block diagram presented @4:55 shows an ADC between the IF stage and the DDC block. I thought the output of an ADC was a binary value (composed of 1's and 0'S) that represented the level of the analog signal at the sampling time. How can such a binary representation of the signal level be used by the DDC? Thank you!
Brilliant! Earned yourself a sub!
I have an on-again off-again project for a SDR based on a superegenerative front end. Phase information is typically obliterated but I plan on recovering it using the fact that the tank circuit stays locked in phase with the carrier. So I want to make a circuit that can recover the phase AND amplitude of the signal in IQ form, just like a normal SDR. The idea is to eliminate the ADC and also have tremendous dynamic range. Most of the SDRs I have made suffer from artifacts when front end is overloaded.
So far I can decode things like 8-PSK, but I hope to make it work for signals in general.
Superregen is very difficult to keep stable, why do you want to use it? It made sense way back when every single tube was very expensive, as it saved components. Now that good RF amplifiers are cheap and perform well, why not use them?
@@philkarn1761 i do still use conventional zero-IF and various IQ front ends. Doesn’t mean I can’t experiment and play around right?
@@weirdsciencetv4999 Sure! I still remember the superregen toy CB transceiver I got as a kid. Got me started...
Nice explanation
Nobody ever explains" why do we want to do this, to generate I and Q signals?" HOW do we use these to eliminate a Sideband?? What is the complete process?
@@robyounce4636 see my newest video: iq Modulation
Iq can make and decode any radio signals, iq measures amp and phase of a radio signal
yeah I've been arguing the whole morning with chatgpt about this until we both finally agree😂😂
thank you for shring
Really good movie
Thank u