How to extend tuning range with an FM RF alignment - Tube Radio Restoration Back to Basics part 13
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- Äas pĹidĂĄn 4. 09. 2024
- 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.
đĽ Other videos in this series:
â Back to Basics 1 - Tube Radio Anatomy: ⢠The Parts That Make Up...
â Back to Basics 2 - Tube Radio Anatomy: ⢠Checking the Power Sup...
â Back to Basics 3 - Follow the B+: ⢠How to Check the B+ Sa...
â Back to Basics 4 - Testing the power output: ⢠How To Check the Power...
â Back to Basics 5 - How to safely test the output tube: ⢠How to safely test the...
â Back to Basics 6 - Preamp, Tone Shaping and of lots of detail: ⢠Preamp, Tone Shaping a...
â Back to Basics 7 - What do those tone presets really look like?: ⢠What do those Tone Pre...
â Back to Basics 8 - We've got LW and SW, but where is the MW?: ⢠We've got LW and SW, b...
â Back to Basics 9 - Do we have FM, and how does it work?: ⢠Do we have FM, and how...
â Back to Basics 10 - The all-important IF alignment of the AM.: ⢠The all-important IF a...
â Back to Basics 11 - How tough can the FM IF alignment be?: ⢠How tough can the FM I...
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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 itâs 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
Itâs always good to know that Iâve inspired someone to save these radios. Thanks for that.
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.
Itâs 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 đ
V. Good knowledge. Pleasure to watch this rare kind of video.
Thanks
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.
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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.
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Great work. Love all of it and how you talk about your own experience in working with this old radios. Thanks.
Pleasure
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.
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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
Yes, that will be demonstrated at the end of
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.
I believe it has to do with export restrictions, but do not have the details. Itâs a pity, since itâs a great little device.
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
Youâre right. I will still finish this radio, and will cover any outstanding issues, probably in another episode of âback to basicsâ. Iâve also thought of a few other things that may fit into a final video in the series.
Manuel How about a consortium with you and Dave Tipton on cabinet restoration?
We havenât found a way to email cabinets to each other yet đ The shipping costs between Australia and Madeira would bankrupt both of us
@@electronicsoldandnew Guess how have to wait and see what Dave does to that ugly radio that cabinet Buzz sent.
Iâm sure heâll perform a miracle, as usual
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.
I believe you can, but some tinkering inside may be necessary. If I remember correctly, the Sabaâs use inductor tuning, but ultimately itâs 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 itâs 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.
@@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'!) đ
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Hi - there seemed to be a problem with the clutch mechanism. As you were tuning the FM, the AM pointer was moving as well.
True. The cleaning and mechanical part has not been done yet
"Make it so!" đ 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 !
In Europe part of the fm band was used by official services at some point.
@@electronicsoldandnew - Got it!
@@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
Please let me know which it is. đ
@@electronicsoldandnew - Let me know what your referring to.
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.
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Great stuff!!
Lynton G4XCQ
Thank you
YAWN, haven't these people got anything better to do with there lives?
Donât quite get the meaning of your comment. Care to clarify?