Loewe-Opta Rheinperle 5717W restoration - Part 7. Cleaning and IF alignment for the AM bands.
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- Опубліковано 8 лют 2025
- #tuberadios #antiqueradio #radiorestoration
Some much-needed cleaning is done. I don't really enjoy this part, but it is really crucial.
The IF alignment is also important, and here I complete the AM alignment for 460kHz, as per the manual's instructions.
The result was quite impressive. Judge for yourself.
Enjoy.
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Oh, l like the split chopstick idea, nice. Regarding the protective tape on the faceplate, can I suggest black gaffer tape or black spike tape, which is cotton based and available in a variety of widths; 12mm is probably perfect for this application.
Good suggestion. Thanks.
Great video Manuel. Absolutely spot on and like you showed a really selective receiver. That would be great in the peak dx cycle and the bands are crowded.
As always, a well presented and informative video. I sadly don't seem to have the patience you have. My videos are rough and ready.. something I need to improve on. You always inspire.
Thanks Manuel.
You should see the first lot of videos I did. They were also very much rough and ready :)
I didnt knew about that filter in the antena input. One more lesson for me :) thanks for sharing
Daniel Saturnino : you’re welcome
It's often as much to stop the IF (both AM & FM) from getting out & interfering with other sets as it is for stopping stray IF-frequency signals getting in, particularly on cheaper 50's European sets which were often used in apartments with shared building antenna systems. You'll sometimes see that reason spelled out in the user or service docs, or occasionally hinted at by a note on the schematic.
Thank you Jim.
What an excellent video. Great explanation of all the important factors. I
was warned away from aligning the IF’s on my last project, but did carry out the rather complicated RF alignment to great effect. It also gave me a chance to use my new (rather old) Signal generator (no frequency counter just a dial).
If you ever get the chance could you explain the phenomenon of image frequencies from signal generators and radios whilst carrying out adjustments? I did try to read it up but just got confused.
Cheers
Lynton
Suggest you obtain a frequency counter to monitor your sig gen. The dial is unlikely to be accurate especially for aligning purposes.
I like the tip regarding the kebab sticks, I get the impression that the British set makers of the time where heavily influenced by the German designed radios. My latest problem is where to source 6.5V 0.3 amp pilot lamps from or whether to go down the LED route, anyway a really interesting enjoyable and well made video from you,.
Harry Stevens : I’ve had similar difficulties finding the 6.3v lamps. However, try 9v ones (dc or ac) and, depending on the power rating, you’ll probably get a good result.
Kebab stick: always useful :)
I get mine at www.atr-shop.de
I find leds give the wrong light and don't look right. ebay has lots of 6.3volt bulbs. Add a low resistance to reduce the stress on the fillaments and they should last forever.
@@jonka1 Ended up fitting some 12v as the 6v always seemed over bright even though the voltage was correct so now I get a dull orange glow a much better look all around, also stocked up on 6,9 and 12v bulbs for other sets in the pipeline, agree about the LED look.
Excellent video, as always. I particularly appreciate the detailed alignment procedure as I will soon be attempting the same on my 1955 Grundig 2030 W/3D. I have it's original alignment instructions, but like yours, it's all in German and there's only so much you can do with Google Translate. Also, re: polishing the knobs, would it be wise to spray lacquer the polished brass to keep it from corroding all over again? Nice tip on the low cost Dremel polishing wheel, BTW.
Lacquer is actually a good idea. It would certainly preserve it for years.
I always thought, the IF trap filter is for preventing the radio becoming a transmitter at that frequency.
That too. It works both ways: stops IF getting out, and stops IF getting in from other radios in the vicinity.
Thanks again, I absolutely love your videos, so informative. I have found my way to this one after viewing most of your more recent ones. I am setting myself up to do my first am alignment and noticed you sometimes use the scope and in later videos a millivoltmeter. I have the same Rigol generator as you and a stepped attenuator, but only a basic analogue multimeter that at best does 0 to 10 volts AC. I am in a quandary as to wether I invest in an oscilloscope or a better multimeter. I seem to be having trouble finding an analogue multimeter that measures in millivolts.
Can I ask in your experience which you prefer? Oscilloscope or multimeter.
Thanks again for the great videos.
i’d say the scope, definitely. it is very useful in so many applications.
Electronics Old and New by M Caldeira Thanks, just checked out the scope you have with my local supplier, very reasonably priced, and 3 year warranty.
Lockdown is a good excuse to treat yourself to some new toys :) Well, that’s what I tell my wife...
Good idea. Blame it on lockdown blues 😊
When the instruction says, you should dampen the other circuit, it doesn't mean the FM coil when doing the AM alignment and vice versa. You have to dampen the other side of the same IF tarnsformer, because the coupling is over critical.
Absolutely right. I got that wrong in my explanation. Thanks.
One more excuisite video! And your german gets even better :-))
Danke