How tough can the FM IF alignment be? - Tube Radio Restoration Back to Basics part 11

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Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ ➠ ➠ ➠ FM is the most important band for me on these tube radios - the sound is absolutely awesome - so a good IF alignment is essential. There are many ways to do this, and in this video I will attempt to show you a few of the methods that I normally use.
Enjoy the video.
🎥 Other videos in this series:
■ Back to Basics 1 - Tube Radio Anatomy: • The Parts That Make Up...
■ Back to Basics 2 - Tube Radio Anatomy: • Checking the Power Sup...
■ Back to Basics 3 - Follow the B+: • How to Check the B+ Sa...
■ Back to Basics 4 - Testing the power output: • How To Check the Power...
■ Back to Basics 5 - How to safely test the output tube: • How to safely test the...
■ Back to Basics 6 - Preamp, Tone Shaping and of lots of detail: • Preamp, Tone Shaping a...
■ Back to Basics 7 - What do those tone presets really look like?: • What do those Tone Pre...
■ Back to Basics 8 - We've got LW and SW, but where is the MW?: • We've got LW and SW, b...
■ Back to Basics 9 - Do we have FM, and how does it work?: • Do we have FM, and how...
■ Back to Basics 10 - The all-important IF alignment of the AM.: • The all-important IF a...
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25 июн 2024

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Комментарии : 45

@DavidTipton101 Месяц назад

Good tutorial on FM alignment Manuel and some nice and simple methods demonstrated to do it. (You missed the bit when a slug is stuck and the top of it cracks and you pull the module apart and damage the insides and it all ends in tears) Great video 😊

@electronicsoldandnew Месяц назад

😊 True. Don’t want to scare everyone off the hobby just yet 😊

@larkop6504 27 дней назад

Thank you, I've actually learned something useful today. You made it seem very simple.

@electronicsoldandnew 27 дней назад

👍

@HyyskanPolttaja Месяц назад

Thank you Manuel. Your videos are always very informative and this one is among the very best. I'll bookmark this and watch it again next time I mess around with a FM receiver.

@electronicsoldandnew Месяц назад

Thanks.

@JonRig Месяц назад

Great vid as always!! I never get tired of these. It is such good referecne material.

@electronicsoldandnew Месяц назад

Thanks

@josephmagedanz4070 Месяц назад

Thanks for another informative tutorial. I always learn something from watching your channel, so thanks for that!

@electronicsoldandnew Месяц назад

Pleasure

@greengrayradio1394 Месяц назад

Very good instruction, Manuel. I struggled with an FM car radio some days ago with the AM suppression along other problems. Part of the problem was "melted" polystyrene caps in the IF, believe they were affected by switch cleaner. Two of them were shorted, strange fault

@electronicsoldandnew Месяц назад

That must have been a tough one to detect.

@sylweksliwka7986 Месяц назад

Super prefekt zresztą ja zawsze !

@electronicsoldandnew Месяц назад

👍

@mackfisher4487 Месяц назад

Prof. excellent, I grant you tenure if I were on the board of examiners.

@electronicsoldandnew Месяц назад

Thanks Mack. 😊 Got to get me some elbow batches for my tweed blazers 😊

@tubeDude48 Месяц назад

As you said, it's not complicated. But a guy name J.L. uses an SDR to align radio's, and he gets really lost and DOESN'T get it aligned correctly. Maybe he will watch this and "re-start" his brain! Excellent, Manuel! 👍

@electronicsoldandnew Месяц назад

😊 he seems to have fun, though 😊

@tubeDude48 Месяц назад

@@electronicsoldandnew He raises the hair on my neck. I want to reach out and tell him NO! Let me show you the correct way!

@electronicsoldandnew Месяц назад

😊

@bofor3948 Месяц назад

At least he always knows which day it is as you join him in his workshop😉

@HyyskanPolttaja Месяц назад

@@tubeDude48 If you want to give him advice then use email. He has announced many times that hi's not reading comments to his videos. He should, though.

@radio-ged4626 Месяц назад

I guess the negative voltage level and then AM rejection is probably the easiest way to do it and as you've demonstrated using a sweep generator and looking at the shape of the response curve can be a bit time consuming for not much if any advantage in many cases. It's nice to play around though and see the different methods.

@electronicsoldandnew Месяц назад

Yes, for me it’s about experimenting various options, and trying to decide which is most suitable for the particular situation

@johnburns6422 Месяц назад

Enjoying the video { Maybe my last one } Flying to Madeira on Monday next scary landing , Beautiful Island , Take care 🙏.

@electronicsoldandnew Месяц назад

Have a good flight and holiday.

@johnburns6422 Месяц назад

Thanks@@electronicsoldandnew

@Radiotechnika-Z.Ch. Месяц назад

I think that the primary and secondary circuits of the bandpass filters in the IF amplifier are too weakly coupled (coupling coefficient lower than the critical one) and therefore it is impossible to obtain a transfer curve with two 'humps'. Greetings from Poland Manuel :)

@electronicsoldandnew Месяц назад

👍

@kazimierzlopienski2142 Месяц назад

Pozdrowienia z polski

@electronicsoldandnew Месяц назад

👍

@BobAndersson Месяц назад

I got a little confused when you were peaking the IF coils by maximising the speaker output while frequency modulating the signal generator's 10.7 MHz output. I guess that could only work as shown if the IF coupling at the ECC85 is such that the induced signal is only just above the noise floor (c.f. your 2V) as with stronger signals I'd have expected a well aligned ratio detector to provide an audio output proportional only to the frequency deviation, not the signal strength. But maybe I'm missing something? It wouldn't be the first time. 🤣

@electronicsoldandnew Месяц назад

I always do the alignment at fairly low levels. If you go higher, the limiting characteristic should kick I. And make no difference to the audio output amplitude (unless, as you mentioned, you increase the deviation of the modulation).

@werner.x Месяц назад

I did understand it in the way, that FM modulation is at it's peak at 10.7Mhz, if you set the sweep oscillator the way he did. So, the output should peak at 10,7 as well. Or did i misunderstand something?

@electronicsoldandnew Месяц назад

No, it doesn’t peak at 10.7, but rather deviates from 10.7 with the modulation. The power of the signal should be the same whether it’s at 10.7MHz or at 10.65MHz as a result of signal deviated by 50kHz below the center. The peak in the response is a characteristic of the filter alignment only, which should theoretically be flat at the top between 10.625MHz and 10.775MHz to allow for the regulatory maximum of 75kHz deviation.

@pankajsharmamarblemoorti8108 28 дней назад

Zenith Radio royal 7000-1 Repair??

@pankajsharmamarblemoorti8108 28 дней назад

Zenith Radio royal 7000-1 I need to get it repaired

@pankajsharmamarblemoorti8108 28 дней назад

Please contact no.

@electronicsoldandnew 28 дней назад

Where are you based?

@marconiufuk Месяц назад

Can you add Turkish subtitles?

@electronicsoldandnew Месяц назад

That’s up to RU-vid, as the subtitles are auto-generated.

@Radiotechnika-Z.Ch. Месяц назад

@marconiufuk When watching a RU-vid video on your computer ( not on smartphone), you can set the translation of English subtitles to Turkish, for example. Best regards.

@electronicsoldandnew Месяц назад

👍

@marconiufuk 29 дней назад

@@Radiotechnika-Z.Ch. I tried, many languages appear, but Turkish does not appear.

@Radiotechnika-Z.Ch. 29 дней назад

@@marconiufuk On my Windows 11 PC, the automatic translation from English to Turkish works seamlessly.