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#66 HAM Radio Tutorial: The SSB Balanced Modulator
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- Опубліковано 24 жов 2015
- In this episode we build a BM and do some experiments with it to understand how it works. A BM is always in the TX SSB signal path.
Absolutely fantastic demonstration and explanation of one of the mysteries of radio design. Keep up the great work Peter. Karl
+Karl Fell Thanks Karl, yeah I have often asked how a BM works, so it is a kind of mysteries...best 73
Thank you for this brilliant presentation. Very well explained and I loved the working model. I’m not very technically minded with regard to electronics, but you’re detailed explanation helped me grasp the idea🤔 Thank you for your time and effort in making this video 👍
I watched a few other videos. While informative, your video really solidified my understanding and what I wanted to know about SSB. I can't thank you enough for this thorough video. Liked and subscribed!
Dear Sir, I came across this video while brushing up my telecom basics as I will soon be pursuing my masters in Electromagnetic Compatibility and I just couldn't resist myself from watching it till last. Great explanation! Awesome job!!
Hi Sameer, thanks for feed-back, glad that you like it. All the best for your new academic master title! All the best Cheers
Great video Peter. Thanks for taking the time explaining these basic principles!
Hi, thanks for watching and comment.
Very helpful, I'm working on a vintage transmitter and this was the first time I undertand what is meant by "balancing out" thank you!!!
Ah okay glad that my video was on any help! Thanks for feed-back 73
Sehr gut Pete! This video has helped me understand and balanced my DSB kit radio. Your wiring diagram is the same on my kit drawings. Although I don't have a spectrum analyzer, I used a dummy load and multi meter to measure the transmitted voltage down to zero to suppress the carrier. It was very interesting to find that null point. If I turned either way, the voltage started to increase. Signal reports from other Ham's were very good. Big Mahalo, Martin, WH6XY
Great Job Peter! It wasn't too long, I would call it "thorough." Thumbs up bud!
+Mr Carlson's Lab Thank you Paul, yes it is thorough although there is much more behind it as you know... never exactly know what to show and what to skip :-(..Take care. 73
@@TRXLab agreed,,
Such a great video ... Thanks for taking the time to make this and to post it ☘️
Thank you, a great explanation with a working demo circuit too!
Play it back at 1.25 or 1.5x! Excellent info for my ham course. Thank u
Wow Pete what a cracking 1hour video...thanks for taking the time out to do this for us all high class as usual
+charlieoscar09 Thanks for the nice feed back! 73
Excellent video. Thank you. You should mention that a simple Beat Frequency Oscillator (BFO) adds the carrier back again at the receiver end. Years ago I heard shortwave DSB broadcast stations using both sidebands with different programming on each sideband.
Next we need to suppress the carrier on FM transmissions (and make the power amplifiers linear). Then do the same for CW - OK, that has been done already using Modulated CW (MCW) into an SSB transmitter. I need more sleep (or less dreaming).
Hi Peter, once again another brilliant video. Your videos are never too long, the longer the better. thanks Peter.................................. Berni UK
+berni ken LOL yes Berni will remember what you said :^) Thanks for nice feed-back 73
If you do not understand SSB after this video, you can't be helped. Everything is presented in this video. it has been presented in depth enough to pass any ham radio test. This is an excellent video on the subject. I think that an understanding of the different modes of transmission is a must for the advanced radio operator. A great effort by our tutor.
+Satellite_Guy Thanks for the kind words my friend!! Take care
Great timing Peter, I am working on a BM in an old Swan 6 meter. Thanks, Carl
Glad that I was able to help
GREAT explanation of how the Balanced Modulator works.
+Grant Fullen Hi Grant thank you!! 73
Very nice explanation Peter, this practical approch is very informative, and defenitly not to long, and as Paul stated a year ago...thorough :-) I really enjoy your videos, it´s always interesting to se a collegue at work - and again - very nice work Peter
73´s
/ Anders
Thanks for feed-back Andres! 73
Another great video Peter!, don't take so long on coming on the air.
Be great to see you and Mr Carlson work together on a project for us viewers that love both of your work.
Thanks again with a massive thumbs up!!!!
+Justin Shears Hi Justin, thanks for comment. Yes good idea just let Paul from Mr. Carlson lab know about you idea.. By the way is you R&S working??
Evening Peter!
Thank you for asking about my R&S, yes I found all the lights to be blown, replaced them and they all work fine.
Maybe you could do a video on how to use it properly for me!.
I am getting used to it, but would be great to see how the masrer uses his!!!!
73's Justin ( M6FKG )
+Justin Shears very good news!! When can we expect repair videos?? :^) You can see me working with the R&S in my CB product test videos. Have a look there you find already a lot about using it... 73
Fantastic video Peter. Thank you for this. Would love to see more videos like this on transceiver building blocks.
+Troy Reynolds (VK6HDX) Hi Troy, thanks for the feed-back! Yeah when ever there is some time I will do more like this videos.. 73
WOW! This is a terrific video. I'm subscribing. Very, very helpful. Thank you.
Very good:) It opened up the understanding quite a bit. Thank you:)
Thanks for very nice video :) ..Sitting this saturday-evening and enjoying&learning. Well spent time on many of your video's here it seems.
Very grateful for all of you wizards out here in UA-cam-Land.
(..a very fine electronic supplement 'this-way',..perhaps many others feel the same too)
+RolfT S Hi Rolf, thank you very much for the kind words an the nice feed- back. All the best!
I love this man ! ;) Great video and explanation! Thanks!
Another interesting lesson! Thx a lot for your great explanation.
Thanks for sharing another fantastic tutorial.Peter.
+rupert handford Thanks Rupert!
Great video Peter. Very helpful for me as a new ham.
+jerry blood Thanks you Jerry. I'm glad that the video has the right content for a new HAM.
Really great video Peter.
thankyou for the great work,, cheers from VK3
Thank you so much for this video. Extremely helpful..
Very good tutorial thank you Peter for time doing this
+DENNIS N Thanjs you Dennis
Excellent video!! Thank you for posting this. Now it's time for me to go to the bench and build one to experiment with myself. ;) 73 de KN4AYP
good luck with your project!
An excellent tutorial Peter! Thanks :)
+Alan Cordwell Thank you Alan.
Nice lesson, Peter. Thanks.
+Robert Calk Jr. Thank you Robert!
Very interesting and helpful. Please do more.
+technos123 Hi, I'm glad that you like the video, thanks for comment!
An outstanding presentation. By far the best on you tube (and anywhere else). I guess the main difference between a BM and a mixer (e.g. as used in a superhet radio) is that with the BM, the carrier frequency is still present at the output but much reduced in amplitude compared to the sidebands. With a superhet mixer I think the carrier amplitude is still present at the output at full amplitude together with both sidebands but now at the IF?
Thanks for feed-back glad that you liked it . all the best
Great presentation. Not too long! Thanks for sharing.
Man, this is great! Thanks. One more subscriber.
Hallo Peter, vielen Dank für diesen sehr informativen Videobeitrag und die sehr gute Erläuterung der einzelnen Prozesse und natürlich die messtechnische Darstellung. Ich finde Deine Beiträge sehr gut und informativ. ich habe schon Einiges für mich Nüzliches dadurch erfahren was mir weitergehölfen hat. Vielen Dank dafür und weiterhin viel Erfolg. Best 73 es 55 de Ralph DB9FQ C31km
Hallo Ralph, freut mich das dir meine Videos gefallen und wenn Du dann noch was für deine Projekte verwenden konntest ist das super. Vielen Dank fürs vorbeischauen und für dein feed-back 73
Very nice and explanatory video Peter. Keep up the good work. 73 de 4S6TMP
+Tharanga Premathilake Thank you! 73
Great teaching, thank you.
+Ron Wilson Thanks you Ron!
Very informative video thanks for posting
+John Gulliver HI John, Thanks for feed back!
Thanks for share, very interesting !!!
Nicely done!
+raccoonnyc Thank you
Great example thank you so much for sharing.
Thanks for watching 73
Great tutorial. Danke.
Excellent!
Another great video Peter. Interesting historical note on SSB or should I say the transition to SSB was DSB. Early tube type side band CB radios were really DSB. They transmitted DSB and received SSB. Not that great a system but it worked as a stepping stone as technology advanced.
Mike
+MikesRadioRepair .CBRadio Hi Mike, well in today's analogue radios the BM is basicly the same idea but it is all in one IC. Additional to that the circuits are active today and not passive like in the past. And off course the phase shift is done with modern semiconductors in the IC and not with a broadband transformer. After that the DSB Signal goes into the DSP for filtering... Thanks for comment I was not aware on the fact that DSB was really sent out in the past. According to my knowledge DSB transmission never happened in Europa on CB. Again thanks for your valuable information! 73
Great Tutorial! Thank you!
+econsphor econsph Vielen Dank für die Rückmeldung! Schöne Grüße nach OE! 73
Excellent.
Thank you for the great explanation 73 from VK4
Thanks for feed back 73
Many thanks 🙏👍👍
good job!!!
Wow, I LOVE that hamshack, or do you work in commercial radio. Looks like the inside of a broadcast shed!
Thanks a lot for share, its very good explained,and I enjoyed a lot, best 73´s From XE1YZY
+Pedro Arnaud (XE1YZY) Hi Pedro, thank you very much for feed-back! 73
Nice video
Thank you 73
awesome lesson ! Now i want to try it myself 27mhz carrier and 20khz modulating signal, what diodes should i use ? value for potentiometer? any daya for last coil ?
please help Sir...
Great... Great.... Just great....
very nice video , thank you for it . 73!
+hossein persian Thanks for feed back Hussein.
Nice job!
Now to be complete, you need to make a second video on the receiving side also. ;)
Thanks. 73
+worroSfOretsevraH Yes, but that is already available in my build series ssb lab monitor. Watching this video here first to understnad the theory and then the ssb lab monitor video will let you understand both :^) 73
Nice overview Peter. I think folks may like to see your PCB "pad cutter" in action as well. I've used both a cutter and PCB pads (or better yet "MeSQURARES" from W1REX for quick prototyping). 73 - Dino KL0S
+Dino Papas Hi Dino, thank you. Yeah will show my DREMEL in one of the next videos. 73
+TRXBench That's "MeSQUARES", sorry about the typo. Folks can look at qrpme dot com to see them.
+Dino Papas Ah very good hint Dino! Thanks you
Peter, are you able to explain in simple language that, by modulating a HF carrier signal with an AF signal (by amplitude modulation), why the resultant mixed signal will consist of frequencies of HF, HF+AF and HF-AF, i.e. double side band? Thanks.
Great deeply technical video! My question to you is there a good way to use an oscilloscope to evaluate the quality of an SSB modulator vs using an oscilloscope vs a spectrum analyzer as I am experimenting with some modulation techniques that are slightly less standard and wondering if I'm getting anywhere especially quick.
Yes use the 2 tone ssb scope pattern. Here you find a description www.nostalgickitscentral.com/heath/73-index/articles/Monitor%20Scope-7-63.pdf and a nice one by Motorola www.ab4oj.com/test/docs/ssb_im.pdf Hope that helps 73
Spectacular reference, downloaded for future use.
Auch von mir Daumen hoch! Ich habs verstanden 😉 weil es gut erklärt ist.
+Jean Heinze Vielen DAnk für die Rückmeldung Jean! Freut mich das es dir gefallen hat. Was macht dein neues Funkgerät?? 73
+TRXBench Hallo Peter. Habe mich dank deines Benchmarks für die CRT Mike entschieden. Sie passt mit einer LAN Verlängerung super in den Kofferraum. Nächste Woche lass ich sie noch beim Händlern meines Vertrauens abstimmen auf genau die Schwachpunkte die du aufgedeckt hast. Hast du eigentlich auch ein Video im Umlauf mit dem Thema Impedanzanpassung im Fusspunkt einer Antenne? Da ich ja immer auf der selben Wellenlänge unterwegs bin aber mit wechselden Antennen würde mich nach der Anpassung am Sender (durch den Fachmann) auch eine einfache Anpassung an der Antenne interessieren.
73!
+Jean Heinze Hallo Jean, nein habe ich nicht im Umlauf. Die Anpssung wird ja normalerweise auch an der Antenne eingestellt. So kannst Du z.B. eine DV 27 sehr genau manuell anpassen. Falls der Händler deines Vertrauens sich in HH befindet grüße ihn von mir :^)
+TRXBench Tut er, mach ich 😉
Presumably the ring demodulator simply works in reverse of the modulator?
Great tutorial on balance modulators Peter. What kind of spectrum analyzer you have there?Thanks my friend for another great video.Buddy
+The Radio Shop Hi Buddy thanks for stopping by! Now waiting for your new video to come. 73
+The Radio Shop Ah sorry Buddy, it is a Advantest R3361
+TRXBench Great, I like it. I have one built into my IFR1200. But it does not have onscreen cursors. Been very busy here with repairs. Will get back on the videos soon :) 73
Thanks so much for your tutorial , very useful and interesting, I would try to build it did not see the value of the potentiometer , indutance, and the cap on the rf output.
+Silvano Calza` Hi Silvano, for the pot you can take 470Ohm and for the inductance it is something between 500 and 1000uH. The coupling cap at the output is 47nF. Hope that will help. 73
+TRXBench Hi Peter, Tested successfully, thank you.
My result, first photo with fixed frequency, second picture with Sweep 1 to 15 Khz
Here are the links.
goo.gl/photos/wxr2ZcPbJz4s2nrp9
goo.gl/photos/x3N5hwjihu7fvBKTA
+Silvano Calza` Nice success! 73
4 x Great^2 .... :) Thanks again Peter....
+Giorgio Firpo Gald that you like my videos Giorgio. All the best and 73
-50dB!!!
Well done.
I wasn't expecting that.
Beginners luck...
:-)
+Peter Walker LOL yes Peter all beginners luck :^)... Well 50db is not bad for a simple test build. Thanks for comment 73
Very interesting. However, would the SSB filter you mentioned at the end not also take out the carrier? Do you actually need to build a BM if the filter is capable of removing everything except the 2.7kHz bandwidth surrounding the desired output?
+Spoolz07 The requirement for a filter like this would be much higher and thus it would be much more expensive. Additional to that this would go into the wrong direction as we do not want to have a component in our signal which is consuming power while we want use the advantage of SSB mode on the other hand.
I really understand how the carrrier is supressed but why cannot the (unwanted) sideband also be suppresed by a similar circuit. (A similar question is why not just use filters to suppress carrier and unwanted sideband. Fantastic presentation thank you so much. No need to answer my question, I will try to work it out myself...
Okay Peter have fun with the studies. 73
That really made a lot of sense thank you vk7hkn
+Kevin Norris Hello Kevin, thank you for the nice fed back and for watching. All the best 73 and Cheers
i know alot of this stuff now but i wish u were my next door neighbor when i was 12 yo old ! i am still learning at 42
Thanks for feed-back. Yes we all still learn every single day :-) 73
First described in 1915, First transmission in 1918
....and still used :-)
Very nice job - thank you. Wish you could have gone into the sideband filter more but very informative just the same.
Thank you Digger. 73
Now I've been reading and learning about SSB for the past day (I'm rather obsessive about these things lol). Still can't find an explanation of the filtering used to remove the desired sided band. I know there is a phase shift method and I believe a crystal filter method and I've found plenty of math but no simplified explanations to get me started :( It's all your fault :) lol.
lol yeah of course :^) Basically it is quit easy you put a band path filter let me say of about 2,7kHz over the wanted area lets say the USB area but not including the reduced fundamental. Now you only have the wanted signal passing trough and the LSB and the rest fundamental will get attenuated.That's it
TRX Bench Conceptually yes - now I need to learn the methods. You've inspired me to hit the Arrl Handbook section on modulation, demodulation and mixers ;) Thanks again for all the lonnng but interesting and informative videos.
TRX Bench I think the ideal follow up to this video would be building a crystal ladder SSB filter :) I'm still learning but making progress on this knowledge. 73s
so on 28.450mhz setting a spectrum analyzer up the same way you have it would produce on screen the same results using an icom 729
on AM yes
An excellent piece on SSB. But what I really want to know is how you cut the little circles on the PCB? Eg. 51:04
+Godfrey Poon Thank you Godfrey. Well I'm simply using a DREMEL retracing coupler of about 5mm. I'm going to show how it works in a next video.. 73
+Godfrey Poon There is also a tool you can purchase called an Island cutter. It is about 30 bucks for it but I made my own. If you search w2aew vides #122 and #123 he has more detail on those.. Cant wait to see how Peter does it.
+TRXBench +The Radio Shop Thanks guys! I have been carving squares with a scalpel, which is both time consuming and ugly. Very pleased to learn an alternative method.
How it's possible that on your oscilloscope, having 2 input signals with the same phase and take a positive signals as output !? ...i have lost some step.. :(
Hi Alessandro, yes that is right. Just make a simple addition with the both signals at the same ´phase angle. Then you find the results and it becomes logical.. Hope that helps 73
Maybe i have lost a RF ground reference for this kind of signals, this could be a small reason to do a new video with this argument .. Thank you again, have nice day !! ^_^ '73
So is it possible to add this circuit with filter switch to a plain AM Transmitter to talk and receive on SSB?
Hi Wiliam, yes basically it is possible for a transmitter but under real conditions you would use a more advanced circuit as this is not fully developed to work broadband and even carrier reduction could be better. This was an example only but anyway it would work... 73
Thank you very much as most people already have at least one AM Radio and would save having to purchase a SSB Radio.
What do you think of these SSB Kits and the FREE Downloads for their earlier versions. They do not list a 10 or 11 Meter version on their site at www.ozqrp.com/index.html.
www.qrpkits.com/ Site in the United States.
Thank you, nice video - VU2IIA
+VU2IIA Mahesh Thank you very much! 73
Another fabulous video! That carrier is way down in the noise. Let's not call that Yeasu an "Old Radio" Compared to it we must be ancient, so let's just call it "somewhat dated". Now let's run through the Hilbert Transform mathematics, and quadrature amplitude modulation equations. We can probably stretch this video out to 4 or 5 hours, eh "old man"!
LOL yes you are right :^). Well if we want to put it on collage level I could talk about it for days LOL. Thanks for watching 73
Please make a video on ssb demodulation using bfo just like that way... Please sir make a video on that..
Where are you based, Peter?
Look, I get the math, I do, I see whats going on, but I dont understand in the laws of physics why the upper and lower side bands appear! The appearance of these side bands, are we moving in to the world of harmonics. I haven't got a clue......just yet.
Excellent video but overly wordy.
Очень интересно. Жалко, что на русском языке нет таких видео
Thanks for ffed-back but Engish is the best I can do for you sorry 73