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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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26th Nov 2022, 11:10 pm | #1 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Some help with Grundig Satellit 2400
Hi all!
I was venturing in aligning my Grundig Satellit 2400. Everything is going well but I came across something weird on the aerial circuit for the 20m band (13,7Mhz to 18.200Mhz). It seems the adjustable inductor and variable capacitor have no effect. I looked the other way and there is a bypass in the circuit with a capacitor. Can anyone help me figuring out why this component is there? Thank you Andre Antunes |
26th Nov 2022, 11:24 pm | #2 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
Also, the original solder track to where that capacitor leads is cut off. Someone must have done this many years ago or in the factory.
The 20meter band (K4 in this case) is actually the band where I have the worst reception. I desoldered that capacitor and resumed the broken solder path with a shunt and still nothing happens if I touch the inductor or capacitor. |
26th Nov 2022, 11:25 pm | #3 |
Heptode
Join Date: Jul 2018
Location: Worthing, West Sussex, UK.
Posts: 983
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Re: Some help with Grundig Satellit 2400
Can you put a photo of the relevant part of the circuit diagram up please?
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26th Nov 2022, 11:35 pm | #4 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
You can download it from here. I translated it from german to english.
https://meocloud.pt/link/b4f2e958-88...0EN_Final.pdf/ |
26th Nov 2022, 11:38 pm | #5 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
This is the relevant part. Not sure if resolution is OK.
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27th Nov 2022, 10:46 am | #6 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
Here is the full schematic in high resolution.
Thank you for your help |
27th Nov 2022, 10:50 am | #7 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
Also, another page with the components and solder side of that specific part
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27th Nov 2022, 12:00 pm | #8 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Some help with Grundig Satellit 2400
On the schematic it would help if you mark with an X where the track was cut and also show where in circuit the capacitor is connected.
Are all the relevant switch contacts for the K4 band making ok? Lawrence. |
27th Nov 2022, 1:11 pm | #9 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
I believe all the contacts for K4 band switch are OK. I already tried to give a good clean on the switch but it's sealed. Here you go with marks where the circuit is interrupted and the new capacitor was installed.
File is zippd for better resolution. |
27th Nov 2022, 2:19 pm | #10 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Some help with Grundig Satellit 2400
So far as I can make out, the capacitor in question is connected in series with the telescopic/external antenna circuit on shortwave bands K2 through to K6.
Lawrence. Last edited by ms660; 27th Nov 2022 at 2:41 pm. Reason: extra info |
27th Nov 2022, 2:40 pm | #11 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
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27th Nov 2022, 2:47 pm | #12 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Some help with Grundig Satellit 2400
Quote:
To see it on the schematic, remove the horizontal connection that goes between switch contacts E14 and E23 and replace it with a capacitor symbol. Lawrence. Last edited by ms660; 27th Nov 2022 at 3:06 pm. Reason: extra info |
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27th Nov 2022, 2:50 pm | #13 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
This seems to affect only K4. If I rotate the adjustable inductors and capacitors for the other bands hat has an effect. Only in K4 it doesn't do anything if I play the adjustable inductrs and capacitors L203 and C209
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27th Nov 2022, 3:19 pm | #14 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Some help with Grundig Satellit 2400
It's in circuit on the K4 band, the telescopic/external antenna is in circuit for bands K2 through to K6 when selected for AM.
Lawrence. |
14th Dec 2022, 10:19 pm | #15 |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
Hi friends, the above problem is now gone. I managed to rebuild the circuit by replacing all the components (caps, trimmer and adjustable inductor) from an old Satellit 2400 that I keep for spares. So, basically I have been solving all the radio's problems one by one.
And now I'm getting to one of the most annoying of all as I can't figure out what it is. On the LW,MW and K1 bands I get crazy noises particularly on the K1 band. But the noise is not what bothers me more. What really bothers me is that I can get no reception on any of these 3 bands. If I use a generator with 1Khz tone acting as a local station I can hear it. I have already replaced the internal ferrite antenna by the one on the other radio. Noise has lowered on MW and LW but no reception. I am posting a video below so you guys can see and listen. https://youtu.be/BdJciJ_4c-Q I have tried with batteries to make sure it's not a power supply interference. Problem persists. I have replaced 1st transistor T401 in the circuit and also tried replacing the IC401. Problem persists. I have also cleaned really well all the switched and such. A full service manual with schematics, translated to english by me (an attempt...) can be found here. https://meocloud.pt/link/63c9bc15-ee...nual%20EN.pdf/ Any help would be highly appreciated! Thanks again Andre |
14th Dec 2022, 11:09 pm | #16 |
Heptode
Join Date: Jul 2018
Location: Worthing, West Sussex, UK.
Posts: 983
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Re: Some help with Grundig Satellit 2400
I have already replaced the internal ferrite antenna by the one on the other radio. Noise has lowered on MW and LW but no reception. I am posting a video below so you guys can see and listen.
Can you reverse your work and swap it back to see if that is the cause of the problem?
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15th Dec 2022, 10:03 am | #17 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Some help with Grundig Satellit 2400
Also if you have replaced the ferrite antenna, then double check and triple check all the connections. If one was accidentally reversed then you would get no reception but would it would pick up your signal generator, as the set would work but with very low gain.
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15th Dec 2022, 1:16 pm | #18 | |
Triode
Join Date: Oct 2021
Location: Lisboa (Lisbon) Portugal.
Posts: 29
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Re: Some help with Grundig Satellit 2400
Quote:
Thanks |
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15th Dec 2022, 5:13 pm | #19 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Some help with Grundig Satellit 2400
Yes, but these do require the ferrite antenna as part of the aerial circuit, regardless of the telescopic.
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15th Dec 2022, 5:15 pm | #20 |
Octode
Join Date: Sep 2020
Location: Thetford, Norfolk, UK.
Posts: 1,731
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Re: Some help with Grundig Satellit 2400
The fact that K2 - K6 (and FM) are working, proves the AM band circuitry is working, so this does point the problem at the various tuning coils along with any associated caps.
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