Radio FM tuner hardware fix - MTCD Hardware Development

Hi all, I have a problem with the radio FM, with the AF (alternative frequencies) that doesn't work properly, indeed it always jumps to the next available station, not the same broadcast station, it should jump to the same broadcast station with better signal, and it gives some kind of audio lag every 2-3 seconds; so I have to disable the AF to listen the radio, but when the signal is poor, of course, it jumps to other different stations anyway. I tried everything, I updated the MCU to the latest, many firmware versions, but nothing worked. I have a Witson PX5 4GB MTCE with latest MX2 2.88b MCU and Android 6 stock ROM actually. I bought a new core board (the same px5 4gb ram board) from Witson, but the problem is still there, so the problem must be with the internal fm tuner module and I want to ask you if there is the chance to solve this problem with an hardware fix/mod, I'm very frustrated and exhausted...

---

exact same situation like you

---

This isn't a "hardware" problem. This is a software problem, and the software in question is implemented in the MCU, which makes it incredibly challenging to fix.
But not impossible.
If your radio is a TEF6686.
If you open up the radio module and clip the i2c pins off of it, and reconnect it to an i2c bus on the SoM (instead of the MCU), then I can provide you with source code for software that can directly control the radio. I have not implemented AF in it though, since AF is not used on this side of the world and I therefore have neither motivation nor testing data needed to implement it. So you would have to do that yourself.

---

96carboard said:
This isn't a "hardware" problem. This is a software problem, and the software in question is implemented in the MCU, which makes it incredibly challenging to fix.
But not impossible.
If your radio is a TEF6686.
If you open up the radio module and clip the i2c pins off of it, and reconnect it to an i2c bus on the SoM (instead of the MCU), then I can provide you with source code for software that can directly control the radio. I have not implemented AF in it though, since AF is not used on this side of the world and I therefore have neither motivation nor testing data needed to implement it. So you would have to do that yourself.
Click to expand...
Click to collapse
Thank you for the reply, but tell me one thing, how is it possible that other users with the same device in my same country (Italy), can properly use the AF? This is why someone in this forum told me that this is an hardware issue and I think the same. Anyway i'm not able to develop software, if you think that it can be solved software side, i hope that you or someone else can develop the AF software and let me test it
Inviato dal mio Z2 Pro utilizzando Tapatalk

---

So no one cares?
Inviato dal mio Z2 Pro utilizzando Tapatalk

---

96carboard said:
This isn't a "hardware" problem. This is a software problem, and the software in question is implemented in the MCU, which makes it incredibly challenging to fix.
But not impossible.
If your radio is a TEF6686.
If you open up the radio module and clip the i2c pins off of it, and reconnect it to an i2c bus on the SoM (instead of the MCU), then I can provide you with source code for software that can directly control the radio. I have not implemented AF in it though, since AF is not used on this side of the world and I therefore have neither motivation nor testing data needed to implement it. So you would have to do that yourself.
Click to expand...
Click to collapse
Hello, could you provide the source code please to be able to control TEF66686 by a i2c bus ? thank you

---

mike2587 said:
Thank you for the reply, but tell me one thing, how is it possible that other users with the same device in my same country (Italy), can properly use the AF? This is why someone in this forum told me that this is an hardware issue and I think the same. Anyway i'm not able to develop software, if you think that it can be solved software side, i hope that you or someone else can develop the AF software and let me test it
Click to expand...
Click to collapse
I can propose a number of possible explanations;
1) They don't really know that its not working correctly.
2) Their radios have a different manufacturer and thus different code running on the MCU.
3) They are running different software versions on the MCU.
I'll tell you exactly how you can prove that its not a hardware issue;
When you tune to a channel, the display shows you the title of the song being played? That means that RDS is working. If RDS is working, then the hardware is providing the AF data, and it is up to the software to use that data.
The radio hardware itself does not deal with AF. It just feeds data up the i2c bus. The software running on the other end of that bus will keep track of the AF data being provided for that frequency, and it will monitor the signal strength. If the signal strength drops too low, it it supposed to trigger a tune to a stronger source.

---

mike2587 said:
Thank you for the reply, but tell me one thing, how is it possible that other users with the same device in my same country (Italy), can properly use the AF? This is why someone in this forum told me that this is an hardware issue and I think the same. Anyway i'm not able to develop software, if you think that it can be solved software side, i hope that you or someone else can develop the AF software and let me test it
Inviato dal mio Z2 Pro utilizzando Tapatalk
Click to expand...
Click to collapse
On my Xtrons PX5 with Oreo and GS MCU 2.94 AF is working correctly.
Check in the factory settings which is the Signal level you have set... it should be -30dB. This is the value of the radio signal that make the MCU to switch to the alternative frequency.

---

royalhawk2002 said:
On my Xtrons PX5 with Oreo and GS MCU 2.94 AF is working correctly.
Check in the factory settings which is the Signal level you have set... it should be -30dB. This is the value of the radio signal that make the MCU to switch to the alternative frequency.
Click to expand...
Click to collapse
-30dB?
where is this setting?

---

If I remember right should be under the factory settings on the tab "other"
emre33 said:
-30dB?
where is this setting?
Click to expand...
Click to collapse
Inviato dal mio SM-N960F utilizzando Tapatalk

---

96carboard said:
I can propose a number of possible explanations;
1) They don't really know that its not working correctly.
2) Their radios have a different manufacturer and thus different code running on the MCU.
3) They are running different software versions on the MCU.
I'll tell you exactly how you can prove that its not a hardware issue;
When you tune to a channel, the display shows you the title of the song being played? That means that RDS is working. If RDS is working, then the hardware is providing the AF data, and it is up to the software to use that data.
The radio hardware itself does not deal with AF. It just feeds data up the i2c bus. The software running on the other end of that bus will keep track of the AF data being provided for that frequency, and it will monitor the signal strength. If the signal strength drops too low, it it supposed to trigger a tune to a stronger source.
Click to expand...
Click to collapse
I meant they have the same headunit, same manufactor, same MCU, and the AF works on their units. On my unit I don't see the song name, just the station name. Anyway i'm done, i give up
Inviato dal mio Z2 Pro utilizzando Tapatalk

---

royalhawk2002 said:
On my Xtrons PX5 with Oreo and GS MCU 2.94 AF is working correctly.
Check in the factory settings which is the Signal level you have set... it should be -30dB. This is the value of the radio signal that make the MCU to switch to the alternative frequency.
Click to expand...
Click to collapse
Tried with no luck. Also tried with different regions like Russia, China, etc.
Inviato dal mio Z2 Pro utilizzando Tapatalk

---

royalhawk2002 said:
If I remember right should be under the factory settings on the tab "other"
Inviato dal mio SM-N960F utilizzando Tapatalk
Click to expand...
Click to collapse
PLS Photo. Thx

---

royalhawk2002 said:
On my Xtrons PX5 with Oreo and GS MCU 2.94 AF is working correctly.
Check in the factory settings which is the Signal level you have set... it should be -30dB. This is the value of the radio signal that make the MCU to switch to the alternative frequency.
Click to expand...
Click to collapse
PLS send an image of the setting. THX

---

@mike2587 any news about solution?

---

xinpin said:
@mike2587 any news about solution?
Click to expand...
Click to collapse
Nope, no one is interested. Witson can't provide a solution, their support is very bad. I won't buy a Chinese car stereo anymore in my life, this is the only thing i can tell you. Good luck.
Inviato dal mio ZUK Z2121 utilizzando Tapatalk

---

I have problem with Radio FM, I have noises and interference, sometimes play good, sometimes bad, I don't know, I have connected radio antenna amplifier, any solutions?

---

royalhawk2002 said:
On my Xtrons PX5 with Oreo and GS MCU 2.94 AF is working correctly.
Check in the factory settings which is the Signal level you have set... it should be -30dB. This is the value of the radio signal that make the MCU to switch to the alternative frequency.
Click to expand...
Click to collapse
mine is 20db

---

captsakis said:
mine is 20db
Click to expand...
Click to collapse
yes now is changed to 20 dB with last MCU 2.94

---

I have the same problem with an A-Sure Android 8.0 4/32gb. When the car is cold, Fm radio work fine.
But when it's play around an hour and in the car it's about 23° degrees, I have a lot of noises in background.
First time I think, a side window was open.
Mcu :MTCE_LM_V2. 88_1
BUILD: 8.0.0 OPR5 170623.007 eng. HTC.20180607.171229
Any solution or send it back?