Poor sound on CDX-GT111 radio

Dear friends,

I'm new here and because it's the only place I found info about the SONY TUX-032.
If someone can help me with a radio CDX-GT111 I recently found, on the radio I hear a lot of noise and the sound is incomprehensible. Can I do something on the tuner to improve it? I connected the handsfree with the 3 and 4 pins (R and L CH) on the tuner and I hear the terrible sound, which then goes to ICs and then you hear it on the loudspeakers. I have recorded the sound, but how can I upload here to hear, because it is AAC and cannot be uploaded?

I've split your post into it's own topic. Please do not hijack topics.

Hi @emarduin.

You can put the file in a ZIP archive and then upload that archive.

I don't know how difficult it would be for you, but it might actually be better to publish it as a YouTube video (I know it isn't a video, but YouTube is a convenient platform for listening to audio content as well as video). With a simple file like an image, we always prefer that they be posted directly to the forum instead of relying on an external host. But in the case of an audio file that would need to be downloaded and then listened to using an appropriate application, maybe the benefits of easy access of a YouTube video outweigh the drawbacks of the inevitable bit rot that will be caused to the post when you delete the video or your account.

Looking at the Google links, it seems that you do not have all of the radio there. I assume you have the user manual for the radio, but do not have any of the control units. Since that radio has three possible bands, long wave, medium wave and the FM band, how do you know which band the unit is receiving?

Thank you for the help, I'll try and upload or on youtube

I have everything except manual (I found it on the net and the service manual, too, but in the second there are no information about the inside of the tuner. You only see the pinout) and I don't have a remote if there is. My problem is to find out the way to tune it up or the waveforms on some testpoints.

I found this on the first try: SONY CDX-GT111 GT161 GT161S VER-1.2 SM Service Manual download, schematics, eeprom, repair info for electronics experts I did not get to far into it but there is a schematic. They also offer other manuals. Good Luck!

That should tell us that either Sony did not make the tuner or Sony took a complete unit from another product. But if noise is what you are getting, with no antenna connected, I would find another project.

This is what I found, too.

The tuner must be sony, the IC is sony the top of the case writes sony, who knows?

Sony is a big company. They will sell their ICs to anyone.

Here is the zip file, not long just a few seconds to hear.
17 Φεβ, 10.53_ radio cdx-gt111.zip (263.5 KB)

Good / Bad news, Sony makes ICs as well, some have been sold on the merchant market.

Sounds like it is listening on a medium frequency, on AM, and a single side band transmission.

added later:
Use your signal generator to find the frequency the tuner is listening to.

1 Like

I don't have signal generator, unless you mean a generator on the oscilloscope.

I mean a signal generator that produces a modulated RF signal that can be tuned to the frequencies of your receiver. If you are serious about repairing and working with receiving equipment, the should be your next purchase. It would quickly help you answer your questions about your radio device. Right now we are guessing and so are you.

No, I don't have, this one just happened. It must be cheaper to buy a new tuner, than all these generators. I found another 2 forums with the same problem. These tuners have some defect and I thought someone here maybe could help me. I'll try something to do, if it is ok then I'll post about. it

Your sound sample sounds perfectly normal! Why do you think the device is not working? You need to get the rest of the radio so you can change the frequency it is listening to.

There is a bass and a feeling that cannot tune fine to a specific number, no matter AM or FM or LW. There is a possibility the TOKO filter to create all of the mess. Now the problem is to find where to buy?

Keep in mind the FM in other countries is not the same frequencies as your country. The Japanese FM band is not the same as the US FM band.