How to extend tuning range with an FM RF alignment - Tube Radio Restoration Back to Basics part 13

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How to extend tuning range with an FM RF alignment - Tube Radio Restoration Back to Basics part 13

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Electronics Old and New by M Caldeira

Күн бұрын

Like the AM RF alignment, the FM is quite similar to do. However, I wanted to extend the tuning range beyond the 100MHz that the radios was designed for, as there is a station at 101.6MHz that I normally listen to. In some radios this can be done, and in this video we'll see if and how to achieve this.
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...
■ Back to Basics 11 - How tough can the FM IF alignment be?: • How tough can the FM I...
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Пікірлер: 42

@BobAndersson Ай бұрын

A big thank you for all your hard work putting this series together Manuel. I no longer consider myself a neophyte but you're never too old to learn (until the grim reaper does his thing) and following along has certainly made me think more deeply on a few aspects of circuit design. Looking forward to your next project, as always.

@electronicsoldandnew Ай бұрын

It’s been a pleasure doing this series. By preparing the videos I too relearn some aspects of the process that I took for granted. As you say, never too old to learn 😊

@manjunathpai1896 Ай бұрын

V. Good knowledge. Pleasure to watch this rare kind of video.

@electronicsoldandnew Ай бұрын

Thanks

@benoySimon Ай бұрын

Greetings Manuel. Thanks very much indeed for sharing your highly appreciated and informative videos. I have just recapped a Hornyphon 676, the UKW reception is fantastic, the dial looks exactly like yours. Unfortunately the band stretches only until 100 MHz. Fortunately my favourite station is below that so it’s fine. I studied and followed your filament to LED bulb replacement video where you added a 4148 diode. In my instance the 4 filament lamps had 6.5v/300mA so with some experimentation ordered some 6v LED Ac/DC bulbs and just a 150 Ohm resistor for each did the job. Current was reduced to 22 mA and voltage to 3.5 and just 2 bulbs were so bright that more were not necessary. Anyway thanks to you, I was able to get the courage to do this as a hobbyist. Grateful for your encouragement and again very kind of you to share your knowledge. Best greetings from Vienna. Simon

@electronicsoldandnew Ай бұрын

It’s always good to know that I’ve inspired someone to save these radios. Thanks for that.

@matambale Ай бұрын

A bit radical to align a radio to what you want to hear, rather than to the display, but then that's something I like about you, Manuel. Wild man! :^) enjoyed the video, as always.

@electronicsoldandnew Ай бұрын

😊 👍

@xsc1000 Ай бұрын

In this case it is just slight shift. But there are plenty of old radios in eastern block you need to change range from old OIRT FM band (64-74MHz) to CCIR. Or use convertor.

@electronicsoldandnew Ай бұрын

👍

@haraldlonn898 Ай бұрын

Great work. Love all of it and how you talk about your own experience in working with this old radios. Thanks.

@electronicsoldandnew Ай бұрын

Pleasure

@Timothycan Ай бұрын

We have a very similar thing here in the UK, with Classic FM being around 101 MHz (actual frequency varies with regions). So, like you, I like to extend the upper end on these old radios.

@electronicsoldandnew Ай бұрын

👍

@wdtazi Ай бұрын

I loved this series, I learned a lot from it, thank you. But, could there be a short part about it, where it is assembled and we can hear its voice? That set of speakers is not everyday, let's see if the "experience" comes through. Hi. from Hungary

@electronicsoldandnew Ай бұрын

Yes, that will be demonstrated at the end of

@tonec3663 21 күн бұрын

Manuel, I've wanted one of those ELV signal generators ever since you first introduced them to us on your channel. The company does not export them to North America. I don't know if this is some sort of legal thing or just a business decision but I think that it is missing out on a large market.

@electronicsoldandnew 21 күн бұрын

I believe it has to do with export restrictions, but do not have the details. It’s a pity, since it’s a great little device.

@davidpocock9529 Ай бұрын

Hi Manuel, just checking I haven't missed something in the past videos on the back to basics series. Way back when you replaced the selenium rectifier with the modern Silicone diode board, it was my understanding that you were going to readdress the resistors values to reflect the actual current draw of the radio, and hence the appropriate voltage drop required to replace the old Selenium rectifier. As part 13 is the last in the series, has this been missed, or have I got it wrong and missed this being covered? Thanks in advance. Cheers and keep the great work coming. David

@electronicsoldandnew Ай бұрын

You’re right. I will still finish this radio, and will cover any outstanding issues, probably in another episode of “back to basics”. I’ve also thought of a few other things that may fit into a final video in the series.

@xsc1000 Ай бұрын

When doing front end aligment, I would rather use voltmeter connected to capacitor in ratio detector than just trying maximum volume. FM is tricky and maximum is not always clearly recognizable.

@electronicsoldandnew Ай бұрын

👍

@mackfisher4487 Ай бұрын

Manuel How about a consortium with you and Dave Tipton on cabinet restoration?

@electronicsoldandnew Ай бұрын

We haven’t found a way to email cabinets to each other yet 😊 The shipping costs between Australia and Madeira would bankrupt both of us

@mackfisher4487 Ай бұрын

@@electronicsoldandnew Guess how have to wait and see what Dave does to that ugly radio that cabinet Buzz sent.

@electronicsoldandnew Ай бұрын

I’m sure he’ll perform a miracle, as usual

@renowden2010 Ай бұрын

Hi - there seemed to be a problem with the clutch mechanism. As you were tuning the FM, the AM pointer was moving as well.

@electronicsoldandnew Ай бұрын

True. The cleaning and mechanical part has not been done yet

@tubeDude48 Ай бұрын

"Make it so!" 👍 I'm always dismayed why foreign radios don't do the full FM range. Here in the US, it's 88 MHz to 108 MHz. And their increments are, (for example: 94.2 or 94.4), where as we are 94.3 or 94.5 I searched, but could not find the ELV some time ago !

@electronicsoldandnew Ай бұрын

In Europe part of the fm band was used by official services at some point.

@tubeDude48 Ай бұрын

@@electronicsoldandnew - Got it!

@bofor3948 Ай бұрын

@@electronicsoldandnew Yes I also detune here in the UK to get 101.3 (Classic). I have tried to use a 10Mhz frequency shift circuit between the antenna and the front end of the FM tuner to make 100 to 108 available, but breakthrough at the frequency 10Mhz down on the dial tends to make it unusable. Just happens that most of the frequencies clash. Still working on it. btw I haven't got myself a good generator for IFs and AM and FM yet. Have been rebuilding my equipment since retiring and rejuvinating this hobby. Still looking, but I have found a reasonably priced adequate device which provides signals which are accurate enough. It is not much bigger than a cigarette packet, acts as a spectrum analyzer and outputs AM and FM. It uses Usb to charge and can connect to PC. Don't think I can say the make here (not sure of rules). But it is well known. The FM goes well above that ELV device. I can PM with details if you wish. Dave

@electronicsoldandnew Ай бұрын

Please let me know which it is. 👍

@tubeDude48 Ай бұрын

@@electronicsoldandnew - Let me know what your referring to.

@lyntonprescott3412 Ай бұрын

Great stuff!! Lynton G4XCQ

@electronicsoldandnew Ай бұрын

Thank you

@JonRig Ай бұрын

Congratualtions on a superb series! Out of inteterest, have you ever tested the maximum limit of the extension? The reason why I ask is I have a Saba where someone, someitme in its history, has managed to stetech the band up to full range (88-108MHz). I have not digged around to see how they did it and whether more was invoved to do it than doing what you have done. You got yours up to 102Mhz so I guess maybe there is more 'headroom' for it to be stretched further although to get it up to 108Mhz seems quite a reach with a standard factory component setup.

@electronicsoldandnew Ай бұрын

I believe you can, but some tinkering inside may be necessary. If I remember correctly, the Saba’s use inductor tuning, but ultimately it’s a question of getting the correct capacitance and inductance at the extremes. The challenge is that you cannot go below zero (capacitance, for example), so when it’s at a minimum and you need to go lower, you need look at the fixed components in that part of the circuit to see if they can be changed.

@JonRig Ай бұрын

@@electronicsoldandnew I suspect you are right and the tinkering would involve changing things inside the FM can (a rather sensitve area!). It's why I haven't done any digging on the one I have as I know I would have to go in there and see what has been done. As it is working great at the moment, I have left it alone! (following the motto 'if it ain't broke don't try and fix it'!) 🙂

@electronicsoldandnew Ай бұрын

👍