If it weren't for the noise of people and radio, I would watch this video many times over. As usual great video Alan.

I am grateful that someone took the time to document the class and post it given the resources they had at the time to do it with. Granted, the audio could have been better but I, for one, am grateful. Hands down this one video clarified the lack of understanding that I had with Ocilliscopes and audio signals. PS, If you could redo the whole video from the beginning and have multiple, switched cameras, a properly EQ'd boom mic, picture in picture with clean transistions and ask everyone to remain silent till the end of the presentation. That would be great. 😉 Thank you Allan.

37 years trying to understand the superheterodyne receiver I finally have a decent picture in my mind! Tank you so much for taking the time to film this video!!

@w2aew

Жыл бұрын

Thank you. I might also show you this video (kzread.info/dash/bejne/iJpkmKqMgpeylLw.html) which illustrates and demonstrates how a superheterodyne receiver works.

@louco2

Жыл бұрын

@@w2aew You can be sure I will watch that one also, simply cant stop they are all GOLD!!

This is one hell of a course in Oscilloscope. I've been looking and watching "how to, use oscilloscope" videos for several years now this is by far the best one I have seen. Thank you very very much I'm going to save this and watch it again with the scope by my side, definitely more than once.

I picked up a Tektronix 468 for $50. a couple of years ago. Wish I had seen this video when I was trying to figure out how it works... Think I still need to watch this video a few hundred times.... Thanks for sharing!

What a beautiful and professional presentation. Made my day.. Thank you for that, Alan!

I've now seen an excellent electronic training course taught at Princeton for FREE! Likely with more knowledge than most professors! THANK YOU! I only wish I had even half this info in radio club meetings I've been to in the past. Most clubs you're lucky to get past "beginner" electronics training!

@W1RMD

3 жыл бұрын

I love the AA5 training aid also!

The subtract function will be useful on high ripple sets. Never thought of that. Thanks foe uploading and recording the lecture in the first place.

I had no issue with the background noise. I've been to enough club meetings to expect these sorts of things. More importantly, this video has taught me more about truly using my scope than any other source up to this point. Thank you for that! Nice work. 73

@kurchak

2 жыл бұрын

I found the weird background music annoying and very distracting.

@unlokia

2 жыл бұрын

@@kurchak As would any sane person.

@thomasmorrongiello999

2 жыл бұрын

@@unlokia Microphone NOT close enough to Alan's mouth Result: we hear the sound from wall bounce... and direct from source... and reverb delay... makes for a cloudy image... difficult to decipher. Multipath distortion. Better would be a closer mic This is important\t material We need to hear it clearly Love W2AEW

Great video! I am very new to electronics and have learned the very basics of my scopes by myself. You put things across very well and in a very easy to understand way. I learned loads from your video! I may watch it again I liked it so much! Thanks for taking the time to share your knowledge, it's much appreciated!

There's alot of information here that I would like to hear, but Ethyle Merman yacking in the background kills it for me.

Just watched your video and have to say it was the finest well spoken video I have seen in a long time. Great job I have a NOS Sencore SC61 and after seeing your video I feel confident on using it now!! I also subscribed so looking forward to seeing more!

Thanks for doing this lecture and sharing it here, absolutely awesome content, definitely learned a lot more about my scopes.

Great video Alan, would appreciate more like this I was glued i have been using scopes for years and found new thing i didnt know Very good

Excellent and awesome instructional video, Thank you ! best one Ive found so far

Greetings, Alan! To my knowledge, I've viewed all of your videos, and I must say, you are perhaps the finest educator I have ever seen, either on-line or in person! Your ability to clarify the most intricate electronics concepts has had a tremendous impact on my understanding of the topic, and I'm certain I'm just one of countless many you have enlightened! Thank you so much for all of your efforts in sharing your vast knowledge of electronics with others! Well done, Sir!!

@w2aew

8 жыл бұрын

well, thank you!! I am glad you enjoy my videos! Be sure to let me know if there is a topic that you would like to see in the future.

@flurng

8 жыл бұрын

Now that you mention it, I was hoping you could shed some light on the topic of parametric equalization. While I understand the basic concept, the specifics of how and why they are designed still eludes me somewhat; for instance, are there parametric eq's which incorporate shelving? Also, is it only frequency that can be adjusted in voltage-controlled filters, or is it possible to modify bandwidth or emphasis as well?

@w2aew

8 жыл бұрын

There are a couple of good topic ideas here. Suffice it to say that it is possible to design voltage control filters that include full parametric control (BW, Q, F). It is also possible to design voltage control shelving filters. I don't know what is commonly used in the pro-audio field - although I suspect that it is nearly all done in DSP these days...

Great job, always informative, always easy to listen to...thanks Alan.

Very friendly presentation that even I understood :) Many thanks for the clear presentation of the basics of measurement oscilloscope I greet and as always look forward to the next interesting video.

Thank you Alan for sharing this with us. Excellent video.

Just starting to bring back a few AA5 radios and this video was more help that a lot of the reading I have been doing. Thanks for doing it and putting it on youtube.

This was great. I grew up in Hunterdon Cty and was originally licensed there in '57. I have been watching your VNA articles but recently picked up an HP 1740 scope (You should watch Dave's EEVBLOG on fixing one of these!). Of course I also have a fondness for tube gear and still have my Halli S38e, which is of course an All American Five. It seems to work all right but now I can fearlessly apply my HP probes to it (IF isolated). BTW I just ordered an Owon HDS272s to eliminate those ground issues. 73, Barry VE7VIE and WV2J ex WV2ECZ

To all the complaints about background noise, talking, poor microphone placement, etc.. This was a presentation given by a guest speaker at a monthly meeting of the NJ Antique Radio Club. Not a professional lecture in a studio. Lecture halls are not the best environment for recording. Few clubs are lucky enough to hear a lecture by such a learned individual.

I hear Harry James' Sleepy Lagoon" in the background along when the AA5 starts. Fitting for AA5 segment!

Thank you very much for a great lecture, exactly what Ive been looking for for ages! (OK the radio noise is a little annoying, but I could "tune it out" ok). Thank you!

Excellent presentation Alan!

Very informative, but hard to stay with Alan because of 1) background noise / music and 2) fellow in the audience who needs to be heard every 30 seconds or so . . . "yeah" "oh" "hmmm" etc. Feels like they kept forgetting it was being recorded.

@w2aew

8 жыл бұрын

The background audio was from the "training radio" next to the scope. Unfortunately, even with its volume turned completely down, it still has some audio output. I didn't turn it off because it takes a few minutes to warm up, and that would have made it difficult to quickly make measurements. I'll have to invest in a wireless mic if I ever record a session like this again. Still, I hope you enjoyed the session in spite of the background audio.

@radiojeff6424

6 жыл бұрын

Maybe next time just tune it off station so that it doesn't disturb the listeners.

@coffeecuppepsi

4 жыл бұрын

Yeah audio not perfect... But it's free freaking amazing content!

@WillBreaksStuff

3 жыл бұрын

It was the extreme close ups that were the most distracting for me. Great content though. I’d enjoy seeing more of this kind of stuff.

@engineereuler1762

3 жыл бұрын

@@w2aew was a radio station? I thought it was a little transmitter of very old music from before the great war being played from a cellphone to a transmitter because there were no commercials, and no station like that i'm aware of out there. Anyway, it added a great ghost movie theme background and the guy right next to the camera was probably the main ghost :) I heard that they invented a "nagging" filter just to eliminate the funny sounds he made and give him his calories back

Valuable information. Especially syncing a sig gen to scope's ext trigger in order to look at filter response.

Another excellent video, Alan, I love your channel!

0:36 "Scopes For Dopes" 😆!!! I need to check that one out myself! I greatly value your videos. All of them are tremendously informative and illustrated with the formulas pertinent to understanding the concepts. Thank-you! God Bless

@johnnytacokleinschmidt515

3 жыл бұрын

I see other comments about their equipment. I have many oscilloscopes. I have a Tektronics 453 I bought on E-Bay. It works... Perfectly as far as I can tell! It just smiles at me everytime I see it. And I smile right back. Great instrument!

Alan ... Thank you for sharing all of your knowledge and understanding. Super Stuff! 73, Neil, K7WK

I do wish the guy that is trying to act like he knows all the answers with his non-stop "right", "Yeah" and "Exactly comments would have keep quite. Even when Alan would have a slip of the tongue the fellow would change his answer like Alan did, Alan would say "no that would cause the signal to go up. the guy would say "you're right it would go up". Alan would catch himself and say "My mistake it should have been gone down." The guy then says "You're right it would have gone down." Please be still at the next session so we can hear the speaker.

@ThePretendgineer

7 жыл бұрын

Mmhmm, yep. Yeah. Mmhmm. Right. Yes it would.

@p39483

6 жыл бұрын

You're right. He should be quiet next time.

@Brian-GoldwingRider

6 жыл бұрын

Glad I wasn't the only one who noticed this. Was really annoying.

@rsattahip

6 жыл бұрын

There's one in every crowd.

@earleclemans4836

5 жыл бұрын

Glad im not the only one that was annoyed by the student that couldn't be quiet

that is awesome. distractions do not mean much in the video, felt more like participating in lecture. only better than I had in my uni:)

It must be the ham in me, but I just added a band pass filter in my brain. Didn't notice the radio or other noises at all, what did annoy me was the grunts and comments from the audience. Nice job as usual Alan, imparting your vast amount of knowledge to the less fortunate 😄 Cheers. Alan, GI0OTC

@roladun

5 жыл бұрын

Just watching this excellent presentation even though I only have few idea of what he is talking about but just love listening to this intelligent presentation, thus the background noise and the distracting hhmm really meant nothing if anyone really wanted to listen to the concept and idea he is passing across. Good job.

@MladenMijatov

5 жыл бұрын

I just muted the left channel and all the noise was considerably lower. :)

I heard all that stuff, but I didn't listen to it......lock onto the instruction.......no complaints.....good video.....good enough to be worthwhile.....thanks, fm

Great video, mega thanks to all involved......

nice intro to scopes. i learned alot about mine here. I have a Gould 1604. Probably more than needed for a beginner but hey, it was FREE. another ham got it from a school and wanted to know if I wanted it. of course, I said yes. Glad to see that I can know how to use it now. Thanks for the video and I am going to look in all your others to see what else I can learn as I am still just beginning in the service and homebrew area here. Thanks again and 73, ad0am

Thanks Alan. That's a very informative lesson.

Very nice presentation, thanks for sharing.

this is a great video lecture, i appreciate it very much!!

The short explanation of probe comp was elegantly presented.

The most vital piece of equipment in any lab. The eyes of circuitry.

I learned so much from this video!!

I soldier through the background noise, can't complain! great video

Very interesting service video looking at signals along the IF strip.

Thanks for sharing Alan!

That was good Alan, thank you!

The best explanations. Thank you.

A very nice presentation, I learned a lot, thank you. You could make a video about your first scope one day. I looked up some Allen B DuMont oscillographs through image search and they seem to be interesting devices. Perhaps a video explaining how to control one of these old scopes and comparing it to a more modern one.

Great video once again, thanks!

Outstanding lesson on a subject that is at the core of my main interest! As a 100% do-it-yourself'er...Due to all your videos, and AA5's, progress in this field has been at a slow/steady pleasing and enjoyable rate! Thanks for this video!

Always great to review the fundamentals (as I seem to forget them so easily now a days!). 73 - Dino KL0S

Could you do a video about safe guarding your oscilloscope and spectrum analyzer when measuring voltages and signals with older tube type equipment. I think that the scope is easy enough but the spectrum analyzer has a low impedance of 50 Ohms. Thanks.

This is excellent - thank you

thanks Alan....excellent lesson

Awesome lesson!

Outstanding video on Scopes. Best I ever saw/heard. Thanks a ton for the effort and the information. Too bad your audio-visual guy had a radio program going next to the microphone thruout the entire presentation causing a somewhat distracting influence - which seemed to get louder as the presentation progressed.

@StreuB1

8 жыл бұрын

I kept pausing the video and turning down the speakers until I finally realized it was something in the video causing the background noise. Unfortunately I could only make it though the 8min mark. It was distracting to the point I kept stopping and rewinding because I was losing track of what Alan was saying. It was almost disorienting. Sounded like singing then talking then like an old TV show. Unfortunate because I guarantee that presentation was excellent. Everyone who was able to partake in it was lucky.

@w2aew

8 жыл бұрын

The background audio was from the "training radio" next to the scope. Unfortunately, even with its volume turned completely down, it still has some audio output. I didn't turn it off because it takes a few minutes to warm up, and that would have made it difficult to quickly make measurements. I'll have to invest in a wireless mic if I ever record a session like this again. Still, I hope you enjoyed the session in spite of the background audio.

@StreuB1

8 жыл бұрын

***** We always enjoy and appreciate your videos, Alan. A little background audio won't change that. :-)

@donaldfilbert4832

8 жыл бұрын

I more than enjoyed the video Alan !! I learned a lot !! Your communication approach is excellent - perfectly pace; with highly focused content; and effectively sequenced for optimal assimilation. I really wish I had this video rather than my Electrical Engineering O'scope classes in college !! Thanks for all your postings !!

@hepcat67

8 жыл бұрын

This type of video is worthy of a "studio" version. Hint Hint ;^)

Thank you for your very interesting lessons Alan, they are great and i personally learned a lot. Just one little suggestion if i may... it would be very helpful for non-native English speakers like myself if you could use a microphone near your mouth to record the audio because the echo from the room, the noises from the radio, the random noises in the room, etc make it harder for us to understand your words (English subtitles would be even better but i guess it takes a lot of work). [This is not usually a problem in your "normal" videos] Again, thank you!

Excellent !! Perfect

Hello there, thank you for the video, i learned a lot

I've been trying to learn on my own how to use scopes. I restore vintage tube receivers (Fisher especially) and a major realization I came away with watching this video is that I don't know WHERE in circuitry to probe so I can get usable images on the scope. This video helped. I sure would like to know where else can I go to learn more about where to probe.

Excellent video Alan. I have modern digital scopes but I still find myself using my old Tektronix or B&K analog scopes. Just can't beat the look of a warm glowing CRT. Keep up the good work. I recommend your videos often to newbies just getting into electronics. One minor suggestion. If you ever do another classroom type session with a radio keep the radios volume down until its needed. With the camera being closer to the radio its audio level was almost higher than you at some points. Just trying to help. :) Mike

Alan, another wonderful and informitive video! I find myself revisiting your videos from time to time after I encounter something familiar and then, boom, your video (on whatever the topic) comes through with clean, clear and concise info to help me better understand whatever it is I'm thinking about. As a little request, could you maybe do a video that hits on the do's and don'ts (especially with regard to analog or CRT scopes) with regard to how power cycling, run time and etc may have a detrimental impact on those appiances? IOW, I may be wrong, but short cycling (using your scope to look at something for maybe 5 minutes) from what I understand is bad? Somethig about quick heating and cooling cycles? Is it better to just keep it on and keep the trace dim when not in use? Maybe just old wives-tales? Also, I have a couple of Tek 24XX series scopes. I believe they have volatile memory that uses a battery? Those have an infinite life? What are the caveats and possible reprecussions of a memory battery going dead? Any insight? Enough stuff for an informative video? Just spit-balling, but something like that from you would be awesome! At any rate, keep those vids coming! Great stuff!

I forgot to mention - nice camera work

great video good explanation thanks

Between the noise of the radio in the background and some one talking next to the camera the distractions ruin the video. Brilliant idea. Thank you for trying.

Curious about where he put the ground clip. ... was kind of hard to see in the video

Fabuluous course ! I grew up building tube superhets with multimeters, rf/af signal tracers, rf/af signal generators, and yes even a wobbulator, but I never had a scope to see these waveforms visually ! Now that I have a good scope, you have inspired me to build a tube superhet again ! Thank you for giving me the joy of doing that ! One question though, in the output stage why dont we hear the ripple in addition to the AF signal ? You said it is rejected as a common mode signal, but I dont see how the single ended tube output stage does that. Can anyone clarify ?

@w2aew

Жыл бұрын

The ripple appears on both sides of the primary of the output transformer. The only thing that couples across the transformer is the AC *between* the primary inputs. The ripple doesn't cause the voltage across the primary winding to change, so it doesn't couple to the secondary.

Excellent!

I enjoyed your video on oscilloscopes. I did not quite understand about the common mode and differential mode voltages on the output transformer. Could you explain that a little further. Thank you.

@w2aew

5 жыл бұрын

Differential mode refers to the voltage measured between two nodes, such as the voltage appearing between the terminals on a transformer winding. Common mode refers to the voltage appearing between these aforementioned points and ground. For example you might read 100mV between the output terminals on a transformer (differential mode), and also read that each of these terminals is ~60V above ground (common mode voltage).

Alan is there a way to learn how to build a spectrum analyzer or converting an old analog oscilloscope by building modules?

@w2aew

7 жыл бұрын

Probably the best documented homebrew spectrum analyzer can be found here: www.science-workshop.com/

Thank you very much for the nice presentation. As you mentioned there is a shift in the frequency even when we use x10 probe to measure the oscillator circuit, then what would be the solution to eliminate such a shift for calibration of radio in a restoration job.

@w2aew

8 жыл бұрын

You'd only connect a scope to check to see if there are signals there, and their amplitude, etc. You don't align the stages that you're probing - you always probe downstream by a stage or two so that you don't load down the stage you are adjusting.

@johnnytacokleinschmidt515

3 жыл бұрын

I've used the "sniffer" inductive loop. I suppose it could still effect the oscillator circuit.

excellent thanks, more please

Very informative lecture Alan, did you get a chance to use the AWG4162 in Beaverton ? Do you think the nice folks at Tek would let you do a full review and teardown ? Cheers

@w2aew

8 жыл бұрын

Haven been to Beaverton recently, but scheduled to go in a few weeks.

very nice

It was a very good video, I just turned the sound off and watched it that way, I hope you do make another video like this one..... Thank you.

What are the best (or your favorite) tektronix publications that you recommend for beginners, middle of the road, and advanced users? I still discover things in my 475 after all those years even though i have one of the most recent scopes. I will never understand why the first scope makers in history ( very probably tek) used the word "trigger" for what they used it for. The meaning of that word probably changed through the decades or it still confuses me

*So Distracting* There is a radio in the background of the audio, so hard to hear Alan.

@robertcalkjr.8325

8 жыл бұрын

Yeah, it was pretty annoying.

@vonzigle

8 жыл бұрын

Alan, if you do any of these in the future suggest a wireless lapel mike--there is a lot of background noise and echo with the camera mike alone, and it's distracting...

@MrMac5150

8 жыл бұрын

Robert Calk Jr. True.

@kevinobrien8803

8 жыл бұрын

But even given that, it was one of the best presentations I have ever seen on CRTs with or without the background noise. This is bookmarked in my notebook and I will also download a copy as its that outstanding.

@kevinobrien8803

8 жыл бұрын

MrMac5150 No I have not. Only just getting into it. Obviously not an electronics expert like yourself.

where can one get this demo radio/tv?

Great video Alan! I’ve learned more electronics from you, Joe Smith and Paul Carlson and a few other you tubers and some good books than I did from any courses I ever had. I pretty much work on old guitar amps, audio gear and most recently tube radios. Lately I have been repairing my old test gear too. I have an old Tek 485 coming in today. That will be a challenge, but I think I’ve found the go to Tek expert on KZread. 😎

@VoidHalo

4 жыл бұрын

Not familiar with Joe Smith. But Mr Carlson's Lab is a great channel. I loved his video on the tube op amp. I'm not big into RF or radio, but Alan's piqued my curiosity in them more than once. I can see being a lot more interested in them once I've learned more. EEVBlog and Big Clive were the two big ones for me when I first got into electronics a couple of years ago.

Good explaning

Thank you for all great info packed into one video! I will admit, when I started listening I thought my cell phone needed an alignment. (jk)

@johnnytacokleinschmidt515

3 жыл бұрын

A little adjacent station interference? Or was it an image? IF stages a little too broad or staggered? 😆

Your presentation was extremely well done. I would greatly appreciate your help with one question: how do you know where to connect the ground lead of the probe to be safe? Do you analyze the circuit and identify ground, do you just use a good known ground in your home/office,...? From the end of the video where the radio is visible it looks like you put the ground clamps on a horizontal wire -- how did you identify this as the correct spot? Thank you.

@w2aew

2 жыл бұрын

The scope's ground is connected to the mains ground in the scope, and thus should only be connected to mains ground in the equipment you are testing.

@lampmanpaul7459

2 жыл бұрын

Great video. Thank you. So is the Radio under test and all the mains measurement equipment including the scope plugged into the isolation TX? Ground lead clipped to chassis of radio?

@edinfific2576

2 жыл бұрын

@@lampmanpaul7459 Usually in such cases the scope is on an isolating transformer, though the equipment itself could be on it instead, but if the equipment during testing connects to something else which is grounded, you might find out after you damage something. You can always connect a high impedance voltmeter and check for both AC and DC voltages between the scope's ground clip and the equipment's ground or zero point where you plan to attach scope's ground clip. You can also check if there is a current between (AC or DC) when connected via a sensitive ammeter and a resistor large enough (physically and resistively) to prevent a damaging current for such circuit (usually in miliamps). Sometimes there is some small current between grounds regardless, and you could play it safe by using either a mid-value resistor (100 to 10k ohms), or a capacitor between 10nF and 100nF, or a 1k ohm resistor with a 100nF capacitor in series which provides DC/galvanic isolation and surge protection (through the cap). Be careful and creative.

When you say beware of ground. Does this apply to a battery radio. For example the scope is mains powered so its ground is mains ground where as the radio is floating. So what precautions should one use to protect the scope when probing the radio? This is the one area that always confuses me wrt what is ground etc.

@w2aew

8 жыл бұрын

A battery powered radio is completely isolated - that's a good thing! You would generally connect the ground lead of the scope probe to the "reference" rail in the power supply system - usually the negative terminal of the battery system. Then, all voltages will be measured with respect to that rail.

@kevinobrien8803

8 жыл бұрын

I guessed that would be the case. Many thanks for confirmation.

Nice Video. Actually all of your videos are excellent. I have the a "Triode Demostrator" made by Welch Scientific, and is in a black wooden frame just like your "trainer radio" you used. Is your made by the same company. I would to get my hands on one of those!!

@w2aew

8 жыл бұрын

Yes, this demonstrator was also made my Welch Scientific. This one belongs to the NJ Antique Radio Club, and was restored by them several years ago.

can you elaborate more on what you have to do, or what NOT do, when you connect an O'scope to an AA5 radio so you don't damage either the radio or the O'scope. Thanks

@w2aew

8 жыл бұрын

I comes down to just a few things. Use an isolation transformer. Connect ground of the scope and probes to the negative side of the main electrolytic filter caps. Never connect probe grounds to different voltages in the same chassis.

@Joejoe-eo6yz

8 жыл бұрын

thanks keep up the good videos. Ienjoy watching them

Alan, Is there a reason why when searching for W2AEW in you tube I get the EEVblog videos instead of your videos? In other words your video is on the screen but the adjacent videos are not W2AEW

@624radicalham

2 жыл бұрын

It's been 4 years and I'm sure that you've figured it out. Algorithms that are sometimes based on money and politics, views and likes.

Do you have a version without the radio / TV sounds in the backround? It makes it quite hard to focus on what you are saying, which is a pitty given the great presentation.

You work for Tektronix?! I knew it!! Something about your videos. Tektronix always has and always will kick HP/Agilent/Keysight's ass. ...and I also just bought my second solid ink printer, another Tek win. ... and my 7623 is still in active service...

Hey Alan, I’m a ME junior and Ive enjoyed your videos and electronics as a hobby for years. If you could recommend a few electronics courses as relative electives, what would you recommend? The decision for ME vs EE was solely based off of my fear of abstract math(aka integral tests and other CAL 3 topics) I am just starting at the university level, do you think an EE is worth an extra semester to attain? I am on scholarships partially so that’s a consideration. Many thanks, Nick

Excellent presentation. For slide 18 can you explain a bit more about the use of an isolation transformer? I have a Tektronix Technical Brief 'Floating oscilloscope measurements and operators protection' (51W-10640-1) that calls this an 'unsafe and dangerous practice and should never be done!'. Have I got this mixed up? Y

@w2aew

2 жыл бұрын

It's better to use the isolation transformer on the radio, keep the scope grounded. Then, when you clip the scope ground lead to the chassis - it becomes ground potential and a lot safer to work on.

@yamakawa511

2 жыл бұрын

@@w2aew Thanks Alan, perhaps the subject of a dedicated video? Also could you consider doing something on the use of a scope and signal generator for assessing balun performance (not the transmission line)? Y

@624radicalham

2 жыл бұрын

@@w2aew I agree. Grounding an oscilloscope and using an isolation transformer should be the subject of a dedicated video indeed. It's not as intuitive or as easy as one might think when first starting out in radio repair. We'd appreciate it Alan!

I'm trying to find an isolation transformer made for electronics work. Can you recommend a brand?

@w2aew

8 жыл бұрын

Something like this (where you mount it in your own suitable case: www.tubesandmore.com/products/P-T169VS Or, something like these are are plug-and-play: www.calright.com/Products/prod_id/2955/ www.amazon.com/Tripp-Lite-Isolation-Transformer-Outlet/dp/B00006HPFH/ref=sr_1_8?s=electronics&ie=UTF8&qid=1468158569&sr=1-8

@JackZimmermann

8 жыл бұрын

Thanks for the tip! Just need to find a 240V version (because, you know Europe :-) And by the way, thanks for putting up all your great videos. I leaned a lot from you.

Nice video, Just one question , both Radio and Oscilloscope are to be on Isolation transformer or Just the Radio? or Only Oscilloscope? Please advise Sir,

@w2aew

4 жыл бұрын

Only the radio.

@udaykalburgi

4 жыл бұрын

@@w2aew Thank You Sir !!

@udaykalburgi

4 жыл бұрын

@erikderuiter7 Yes, It's socket is separate with good ground. Thank you for info

To anyone wondering about the "background music": it is actually coming from the speaker on the demo board to our left. You can notice the scope signal changing with the music, which means it is hooked up to it and displaying what the radio speaker is playing. This was sort of a dumb setup to let the radio play during the lecture, but maybe it wasn't that loud to the audience because the camera was fairly close to it and turned towards it, plus the microphone is more sensitive and picks up more of the room sounds than the human ear. Chances are that the radio sounded at least twice quieter to the audience in the room than it does to us, but it was still a dumb choice to keep it playing throughout the lecture. I for one feel a little better and relieved to find out the source of it; it was more irritating while I thought it was done by some rude and careless student and that it was disruptive to the audience in the room. I also notice that the camera's live video was hooked up to another projector and displayed on the left side of the lecture board, which shows the additional mistake of not using giving another microphone or an audio recorder to the lecturer so that the recorded audio would sound a few times better. Clearly, the recording was arranged in agreement with the lecturer, so a better setup could and should have been made.

Great presentation, but the radio show play in the back ground was very distracting through my speakers. Why was that present anyway?

@w2aew

8 жыл бұрын

The background audio was from the "demonstrator radio" next to the scope. Unfortunately, even with its volume turned completely down, it still has some audio output. I didn't turn it off because it takes a few minutes to warm up, and that would have made it difficult to quickly make measurements. I'll have to invest in a wireless mic if I ever record a session like this again. Still, I hope you enjoyed the session in spite of the background audio.

@ZenithClarity

8 жыл бұрын

***** Yes, i enjoyed it very much. A little through half way when i had to stop. Will watch the rest later. Thanks for the reply.

i would like to buy a demonstration radio like that....

Great Video Alan, I have noticed there have been no new ones for a while, are you OK, or on vacation? 73 Larry

@w2aew

8 жыл бұрын

Just too busy with other life priorities, and my daytime job...

@larryrenaud7462

8 жыл бұрын

Supper was just concerned, look forward to more great videos in the future when time permits. Regards, Larry

Excellent stuff from Alan - too bad the backing music other noise make it difficult to take it in.

A younger colleague of mine used my Tek 2465 in single shot mode. He asked me if it was broken because "the screen only flickered once". I smiled and answered that it was because the memory wasn't "hooked up".

@w2aew

8 жыл бұрын

...or it was the loose nut in front of the scope!

@g412bb

8 жыл бұрын

Spoiled by the modern wonders of digital technology.I think it would be cool tough to see a video with a full setup with a scope & camera.

I agree with you Trent. Really nice presentation destroyed with background noise. Not sure what the purpose of it was, but I could deal better with the gentleman every 30 seconds or so, than the background cartoon audio.

This will be good. Comments afterwards.