I feel like enlightened! As soon as I get an oscilloscope, i will make everything you used here!
@MIKROWAVE12 ай бұрын
A godlike presentation Alan! You mean you don't have to count pulses. I already purchased a stethoscope!
@jpopwell15 жыл бұрын
I always enjoy your stuff. Teaches me new things and new techniques . Please don't get tired of teaching us.......
@w2aew5 жыл бұрын
Thank you - I won't grow tired of it, just hard to find the time to put together good videos sometimes.
@jpopwell15 жыл бұрын
@@w2aew Quality takes time.......but is VERY worth every second....
@BillyBonin5 жыл бұрын
I agree, I've learned so much watching these videos more than rereading my textbooks sometimes and it helps me in my electronics hobby as well.
@stevekoehn16754 жыл бұрын
I agree
@lor0the0fallen0angel2 жыл бұрын
This channel is pure gold.
@filiprosu85355 жыл бұрын
By far my favorite engineering youtube channel. I also enjoy the Boom guy, Australian Guy and the Bell Labs Microwave Guy. They all have really educational videos and very practical approaches, but I find this channel the best, none explain things so clearly. Probably the calm voice also helps. When I watch the Australian guy all I hear is screeching.
@PhillipRhodesАй бұрын
OK, I'm pretty sure I know who you mean by "the Boom guy" and "Australian Guy"... but can you tell me who "Bell Labs Microwave Guy" is? That sounds interesting, but I'm not sure I'm aware of that channel...
@yo3kxl4 жыл бұрын
Very elaborate and clear presentation, thanks a lot ! I am interested to study and finally make some pulse-counting detectors, so I watched your clip very carefully. Congratulations! While studying the history of this type of demodulation, I discovered that there were many companies that produced FM tuners with pulse-counting. The undisputed champion is Kenwood, but I also noticed Accuphase, Heathkit and Fisher. Here are some FM tuner models equipped with pulse-counting demodulators: Kenwood 600T (1976), KT-615/815/917 and L-07TII (1979), L-01T and KT-80 (1980), KT-9XG, KT-900/1000/1100 (1981). Kenwood produced pulse-counting discriminators using discrete components, discrete+some known ICs (TA7060P, SN74LS03 or SN74LS38N, HA1457, NJM4558D) and dedicated/proprietary ICs (TR4010A and TR4011). Another FM tuners with pulse-counting: Fisher TFM-1000, Heathkit AJ-1510AS . I hope that these informations will help. Also, a good source of info is the "Tuner Information Center" at www.fmtunerinfo.com/kenwood.html . Good luck and be sure you have one more student watching your clips! :) Best 73s de Cezar YO3FHM
@w2aew4 жыл бұрын
Good information, thank you for sharing.
@JonHeckendorf5 жыл бұрын
To the best of my knowledge including the many years I worked in RF, I never came across this type of Discriminator. Very interesting to me. Thanks again for giving me something to look into.
@bcarlyle77414 жыл бұрын
Kenwood/Trio used it in their last line of all analog tuners (around '79, KT-615, 815, 917). They were so proud of it they printed PULSE COUNT DETECTOR no fewer than three times on the front of the case.
@kanagarajpalanivel82713 жыл бұрын
I am a MD physician fro India.amazing video about pulse counting demodulation.vivid as usual
@JonHeckendorf3 жыл бұрын
@@bcarlyle7741 Sorry for such a LATE response. KZbin didn't notify me. Thanks for the information. I'll look into Kenwood tuners. I'm still surprised that I never heard of this technique knowing my background.
@andrewferg87375 жыл бұрын
Best educational videos on KZbin! Thank you again.
@menacesaidimbanned97545 жыл бұрын
Glad to have you back.
@dl7majstefan7535 жыл бұрын
Very good explanation. I have an old Modulationmeter for AM and FM. The FM-Modulation is measured with this principle, because such a FM-Demodulator is very linear when built properly.
@buffplums5 жыл бұрын
What a brilliant demo! This is the type of project that makes me want to get back into RF engineering.
@Luzt.4 жыл бұрын
These videos rekindle my love affair with electronics. Thank you w2aew!
@bertholtappels10815 жыл бұрын
Thank you, for another selfless gift to the world. You are absolutely the world's best teacher on RF design topics.
@octavmandru92195 жыл бұрын
Another mystery unveiled for me! Thank you Alan, always a great pleasure to watch your videos. I even downloaded every video you posted for me to watch in case YT goes down. I said it before and I have to say again: you are a treasure for us. Thank you, prof. Alan Wolke
@thomasw61695 жыл бұрын
Thank you for teaching great stuff. One of the best channels.
@andrewferg87374 жыл бұрын
Correction: THE BEST CHANNEL !!
@buffplums5 жыл бұрын
Nice to hear someone who knows their stuff and speaks with confidence on a very interesting subject.
@troutrou05 жыл бұрын
Thanks Alan for yet anotber delightful video. The format is just perfect, finely polished. Nothing needs to be added or taken away. :-) Every bit of it is enjoyable and the sum makes for a really efficient learning tool. Knew nothing about RF before I started watching your videos and those of Shahriar/TSP, but I am glad to say that your work paid off. I am now no longer afraid of mysterious looking shielded cans....for the first time last week I had the opportunity to be confronted with the stuff ...albeit to a modest extent....FM radio reception in my 20 year old car was horrible. Car has a preamp sticked to the base of the roof antenna. Yeah, a shielded can ... I thought yeah let's open it see what's inside this thing, maybe I can fix it ! And yeah I was lucky I could fix it... Just yet again a bad electrolytic cap ! LOL But whatever, point is I was not afraid of opening the can, and took pleasure at studying the board to see how it's put together, armed with all the knowledge you and Shahriar dispense ! Anyway, all this long winded post just to thank you for taking the time to produce such marvelous videos. They are very efficient and enjoyable, extremely appreciated, and as I tried to illustrate above....they actually produce positive results :-) It takes work to produce such well crafted videos so I don't know how long it will be before you get tired of it, but even if you were to give up tomorrow, I would still be very grateful for all the videos you have done so far ! :-) I see that you are now past the 100K subscribers, quite a milestone for a niche channel like this one. This means people really see value in your work, so I am hoping this will keep you motivated and that we will be able to enjoy your little gems for a little while :-) Greetings from Frog land, Vincent Trouilliez
@w2aew5 жыл бұрын
Thank you - I agree, Shahriar's content is outstanding.
@koffibanan30995 жыл бұрын
waw..., I am always amazed at the clarity with which you can explain every subject you touch upon. Thank you very very much for these videos! All the best from Belgium!
@brothertyler5 жыл бұрын
Thanks a lot Alan. Please don't stop! You make a lot of sailors better aviation electronics technicians!
@stanilastefan16875 жыл бұрын
I am amazed by your explanation skills. Thank you.
@sbservice6444 жыл бұрын
Wow!!! Perfect explained. All your videos are amazing Alan, thanks a lot.
@AntonioBdeJesus5 жыл бұрын
What a great job! Crystal clear explanation from beginner to expert. Thank you very much also for the link from VK2ZAY.
@andrewferg87374 жыл бұрын
Best videos on KZbin! Watched this video 3 months ago with the intention of improving my radio building skills. Was my first introduction to pulse generation. As I learned more about PWM circuits, I got side tracked and made a modulated carrier IR circuit and motor control circuit. Eventually, I'll be ready to make a Pulse Counting FM Demodulator. Thanks for sharing and educating us!
@xDR1TeK5 жыл бұрын
Alan did it once again. I said it once boys and I'll say it again. Pack your stuff because there is one engineer here and it's Alan.
@jeffryblackmon48465 жыл бұрын
Thank you for producing such great information-loaded videos. ARL 73!
@scose4 жыл бұрын
Fascinating. It seems like digital-style circuits with switching are "unreasonably effective". they are still so useful for such an analog, frequency domain problem as FM demodulation.
@SatyajitRoy20485 жыл бұрын
Really you are the best to explain things. It goes straight into mind. Pulse counting technique is really interesting. Thanks for all your efforts in making this video.
@vincei42525 жыл бұрын
Very cool, Alan. Appreciate the top notch content for my ride home from work!😊
@w2aew5 жыл бұрын
Hopefully you're not driving!! ;-)
@vincei42525 жыл бұрын
@@w2aew lol, no. Metro North from grand central!
@TheRadioShop5 жыл бұрын
Great explanation and demonstration Alan. Enjoyed it very much. Thumbs up
@billmoran38125 жыл бұрын
Alan, always great stuff. I’ve never attempted to build an FM receiver from scratch, but this method looks so simple.
@w2aew5 жыл бұрын
Works amazingly well for how simple it is.
@Seiskid5 жыл бұрын
What a great little tutorial. This explanation makes it very clear. Really makes sense now.
@NodeEntry5 жыл бұрын
It'll never be said enough, but thanks for putting up such quality content, man. You've helped me through my undergrad to grad to real world work experience - even if what you've posted is not directly applicable to what I'm working on. The explanation of your content is superb. It's something to emulate.
@robertcalkjr.83255 жыл бұрын
Thanks Alan! Nice video! I can't believe that some jerk disliked this video!
@bfx81855 жыл бұрын
It's pity you don't produce videos so often ... I love your explanations! As always superb video! Thank you so much.
@w2aew5 жыл бұрын
I wish I could do more too - just don't have the time. Several hours of work are behind each of the videos, as you might imagine.
@bfx81855 жыл бұрын
@@w2aew I understand hopefully will be more. Please and could you prepare video about noise sources and how to properly measure performance of homemade noise source?
@wolfmonk9d5 жыл бұрын
Well, this is quite an elegant solution. Sure I have to build a railroad communications receiver this way. Russian railways use 2.130 and 2.150 kHz FM channels so I could simply build a fine receiver using ferrite antenna with differential RF amplifier IC and circuits shown here. Great job, thank you. 73 de R2ATO!
@p23q5 жыл бұрын
I am always looking forward to your videos -- you are the only one where I asked youtube to notify me :-).
@elanman6082 жыл бұрын
Ah the nostalgia. I first came across the pulse counter in point to point microwave links for video and audio distribution. One thing I can't drag out of my memory is that we were told the pulse counter was inherently 3dB less noise than a Foster Seeley, but I am damned if I can remember why.
@fullwaverecked5 жыл бұрын
Remarkable video. Thanks Alan!
@peterb83875 жыл бұрын
Absolutely exquisite video ! So pumped to go to my own little lab and spend the weekend there ! Really enjoyed this video.
@bennguyen13135 жыл бұрын
I always thought the carrier frequency was fixed, and it was another signal that frequency modulated.. now I know better! Thanks!
@StefanGeets5 жыл бұрын
You keep me learning new stuff thanks to your excellent videos. Thank you !
@Smoke20105 жыл бұрын
Outstanding as always. Clear, concise explanations and interesting content.
@bonearmy15185 жыл бұрын
Very informative video. Helped me visualize demodulation and how exactly it is done.
@PhillipRhodesАй бұрын
Oh man, that is good stuff. FM demodulation has always sort of mystified me and that goes a long way towards making the picture clearer. I'm definitely going to take a stab at building one of these and testing this out!
@w2aewАй бұрын
This is a bit of an obscure technique for FM demod, but it works. Most probably use a pll.
@PhillipRhodesАй бұрын
@@w2aew - yep, I just ordered a bunch of 4046 chips a week or so ago for doing some FM demodulation experiments. But I think my mistake before was in thinking that there was exactly one (and only) way to do FM demodulation (using a PLL). Now that I can see that there are different ways, the whole idea just makes more sense. It's kinda hard to explain, but in any case, thanks for the video. It's a big help (as is all of your content!).
@hamradio3235 жыл бұрын
I realy love your way explaining things. Thank you for spending time on it. Dick Netherlands.
@M0NTVHomebrewing Жыл бұрын
Fantastic video Alan - as always. I found this at just the right time as I'm playing with fm modulation and demodulation for the first time. I built your circuit and was amazed at how well it worked. I'm looking at building it into a larger receiver like VK2ZAY. Thank you so much for explaining so well. 73 Nick M0NTV
@asalgolmanesh78175 жыл бұрын
I used to demodulate FM with quadrature fm demod or pll circuit ,by reading the output dc voltages ,THANK YOU aLOT
@jimyohe1005 жыл бұрын
As always educational and entertaining. Thanks.
@thomasw61695 жыл бұрын
A real experts pointer. Tek.
@ats891175 жыл бұрын
Great video. Thumbs up. This actually could be a pulse counting FM demodulator if the pulses were fed into digital circuitry which calculated the time between successive pulses (i.e. the instantaneous period of the output) and the reciprocal of this would then be the instantaneous frequency which represents a voltage at that point in time.
@andrewferg87375 жыл бұрын
Finally got my TA2111 chip project operating in FM mode. It's been my practice stage to gain experience combining the Osc and RF coils with a ganged capacitor as Alan has suggested. It's been much harder than an AM receiver! I think I'm almost ready to try the pulse counting FM receiver...
@timothystockman75335 жыл бұрын
I have a Kenwood KT-815 receiver, which uses a pulse count detector. Both the specs and the sound are excellent. Belar uses the pulse oount detector in their FM modulation monitors, --de N3TPS
@w2aew5 жыл бұрын
*VERY* interesting - I didn't know of any commercially made receivers that use this type of FM detector - thank you!
@timothystockman75335 жыл бұрын
@@w2aew The kT-815 is dual conversion, it has a normal 10.7 MHz IF strip for selectivity, after which the signal is heterodyned to around 200 KHz for the detector. They get 0.04% THD and 80 dB S/N (full quieting) is stereo mode!
@yo3kxl4 жыл бұрын
@@w2aew Very elaborate and clear presentation, thanks a lot ! I am interested to study and finally make some pulse-counting detectors, so I watched your clip very carefully. Congratulations! While studying the history of this type of demodulation, I discovered that there were many companies that produced FM tuners with pulse-counting. The undisputed champion is Kenwood, but I also noticed Accuphase, Heathkit and Fisher. Here are some FM tuner models equipped with pulse-counting demodulators: Kenwood 600T (1976), KT-615/815/917 and L-07TII (1979), L-01T and KT-80 (1980), KT-9XG, KT-900/1000/1100 (1981). Kenwood produced pulse-counting discriminators using discrete components, discrete+some known ICs (TA7060P, SN74LS03 or SN74LS38N, HA1457, NJM4558D) and dedicated/proprietary ICs (TR4010A and TR4011). Another FM tuners with pulse-counting: Fisher TFM-1000, Heathkit AJ-1510AS . I hope that these informations will help. Also, a good source of info is the "Tuner Information Center" at www.fmtunerinfo.com/kenwood.html . Good luck and be sure you have one more student watching your clips! :) Best 73s de Cezar YO3FHM
@kai-lunwang66855 жыл бұрын
Nice MDO and nice demo!
@Radiowild5 жыл бұрын
That was very interesting. Never knew there were multiple ways to discriminate FM. Cool stuff!
@aduedc Жыл бұрын
Great video. There is also another reason why we need to down convert to use this demodulation method, and that is it is very difficult to generate sharp pulses with low duty cycle at high frequency. For example for 100MHz signal, you need to generate pluses with 1ns or better ( Lower pulse width) and then integrate them. Of course, you can use say 20KHz bandwidth integrator (bandwidth of sound or info) that is not hard, but generating 1ns pulses or better is hard, but not impossible. Maybe, this is another way of direct conversion receiver.
@AC9BXEric5 жыл бұрын
Innovonics used this method in their broadcast industry tuners such as their 530 modulation monitor. They take the broadcast band down to the very common 10.7 MHz first IF. Then they drop that by 10MHz leaving a 700 kHz 2nd IF, ideal for the broadcast band. A fully loaded broadcast station with stereo and RDS at 100% modulation, +/- 75kHz in North America, is 253kHz occupied bandwidth. 700k is a pretty good number. Well implemented this method has extraordinary fidelity.
@AC9BXEric5 жыл бұрын
And they did this with familiar components of the day, CD4053, 4046, 74HC148, the venerable SA602 and basic transistors 3904, 3906. PLL tuner control was by the popular MC145170. They have the circuit description and schematic for the 530 and 531 on their website. As broadcast gear these were intended to be field serviceable.
@NikkyKnowsUNzs20015 жыл бұрын
Your notes are great!just don't forget to take a break sometimes, tech, computers, etc is more addicting to me than ANYTHING!!!!!!
@johng7rwf4195 жыл бұрын
Very clearly and well explained.
@vk2zay5 жыл бұрын
Great explanation and video as always Alan. Thanks for the shout-out to my old receiver project too!
@w2aew5 жыл бұрын
It's the least I could do for a fellow engineer, amateur radio operator, and most important - another Alan that spells Alan correctly!
@AlanGarfield5 жыл бұрын
@@w2aew us Alan's must stick together!
@damonhill68242 жыл бұрын
Very enlightening. I have a Heathkit AJ-1510a tuner which appears to use such a detector. Integrator/amplifier uses a 709 opamp; I want to see if a better opamp will improve audio quality.
@jaa939975 жыл бұрын
A very classy pointer !
@fmhomelab19695 жыл бұрын
Very interesting Alan! Always enjoy your videos. I am also working on FM receivers (see my channel), but did not know this method of FM demodulation yet. I’ll certainly give it a try. My preferred method at this moment is using a crystal filter and tune the IF to be on the slope of the filter.
@w2aew5 жыл бұрын
Yes, slope detection works and relatively easy to implement, but it can be non-linear which can add distortion to the detected baseband signal. I'm sure you've likely found this.
@topphemlig11915 жыл бұрын
Awesome video, thanks for sharing this technique - I always learn something from each video you make
@neilspires87385 жыл бұрын
The more I try to understand radio or electrical theory the more I'm convinced that it's literal magic
@neilsheldon83553 жыл бұрын
Loved he signal source material at the end! :)
@alexandernikolov79775 жыл бұрын
Thank you for this video sir, really very useful and interesting, thank you for your time and effort.
@DeeegerD5 жыл бұрын
Good to see a new vid - excellent as always.
@feicodeboer5 жыл бұрын
Clear explanation and demo as usual, great stuff, thanks.
@WaldemarHeimann5 жыл бұрын
You are a magician! Love your videos!
@wilfriedsprenger58402 жыл бұрын
Thank you for this excellent vídeo, very well explained. Greetings from PY5ZWS , Brasil.
@ingussilins63305 жыл бұрын
I made pulse count FM radio... sounds is good and circuit is simple ( good for beginners ). dont need special measurements and settings ( like a clasic discriminator circuit )
@amanuelnigatu4621 Жыл бұрын
i always enjoy your stuff!!!!!...thank you for ur help tnx sir keep it up!!!!
@FlameRat_YehLon5 жыл бұрын
This is actually the first time I see RM being used for practical (rather than sound design) signal processing... My background is basically not electronic so I still need to learn a lot. Giving that this is already the 303rd video I guess I have a lot to catch up then :)
@FixDaily5 жыл бұрын
Enjoyable video, thanks for sharing, it gave me a lot of information that i didn't know. Thanks
@DavePKW5 жыл бұрын
Great stuff! This is a new one for me. Great job as always. Thanks a lot.
@electronic79795 жыл бұрын
Useful video. I like it
@peterhildenhagen52984 жыл бұрын
Very good explanation, very interessting, thank you for the video
@clems69895 жыл бұрын
Would love to see more radio circuits analyzed by yourself .. Thanks Again....
@GiNodrog Жыл бұрын
Brilliant, I'm alway looking for different ways to come do things .
@maciekkawalkqcwski86163 жыл бұрын
Awesome video. Very well explained
@msf60khz Жыл бұрын
Thank you for an interesting video. The IF filter cannot remove the image. There are always two tuning points. I have used this technique for 2m FM reception. Also there was a tiny pocket FM receiver made by Sinclair in the UK in about 1970.
@scienteer35625 жыл бұрын
That ”Remarkable” tablet looks amazing. Love that you can have graph paper as a background. Can it do smith charts too?
@w2aew5 жыл бұрын
Not natively, I'd have to see if I can upload a background image...
@mosiotv5 жыл бұрын
Thanks! was so much interesting. Please take care of yourself and upload more often 😁👍🏻
@bdugh5 жыл бұрын
I always enjoy your videos, but I have to ask. Are you secretly Forrest Mimms III? Whenever I see you draw everything out on the graph paper it brings me right back to the little paperbacks from radioshack.
@w2aew5 жыл бұрын
The Mimms Engineering Notebook series from the 70s-80s were a big influence on me as a kid.
@researchandbuild17513 жыл бұрын
Finally a fm demod i can actually build
@amirb7155 жыл бұрын
fantastic! thanks!
@watsok5 жыл бұрын
Thought about using a digital function like a Schmidt trigger for the limiter function? Really like all your postings.
@kieranj675 жыл бұрын
Thank you, excellent video
@tamaseduard51455 жыл бұрын
Good job dude 🙏🙏🙏
@joopterwijn5 жыл бұрын
The bloody thumb is to freaking small! Thanks Alan! ✊👍👍👍👍👍
@mironovtt5 жыл бұрын
Thanks for your great job!
@mcflapper75915 жыл бұрын
thank you!
@phillipyannone31955 жыл бұрын
Lots of good info. Thanks.
@baghdadiabdellatif15812 жыл бұрын
Great work. Thank you
@rogeronslow14984 жыл бұрын
Still the highest thumbs up to thumbs down ratio I've seen on YT.
@GiNodrog Жыл бұрын
I've been thinking of something similar, if I could use the FM modulated rf to change and alter the freqency of a square wave oscillator, then simply by integratigration of the edges (via a small capacitor and r ) [I'm a great fan of Shmit triggers , namely using a coil instead of a r in the feedback! ] obtain pulses praprtional to the modulation frequency. Using say the +'ve pulses and then average out to obtain the Af !
@w2aew Жыл бұрын
Yep, another way to skin the cat...
@gonebamboo41165 жыл бұрын
Excellent! Thank you
@xtevesousa5 жыл бұрын
Great content, as usual. What tablet/software are you using? it looks very nice and readable.
@w2aew5 жыл бұрын
It is from Remarkable (www.remarkable.com). Pricey, but works very well.
@byronwatkins25653 жыл бұрын
One should point out that using a saturated input to the pulse former means that the power supply rejection will be quite poor.
@EngineeringVignettes5 жыл бұрын
A very interesting FM demodulator. Do you think it would be an issue to have the LO tracking the RF frequency so closely? I guess one consideration would be to have the LO not sitting on the next upper or lower FM channel adjacent to the one being demodulated but somewhere between the stations... As always, another pure gold video. Stellar stuff! Cheers,
@widecast5 жыл бұрын
The figures were just to explain the principle and not meant to relate to any specific FM band plan or system.