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When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
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This is the LM380 picking up the wifi. It is a low rumble like bubbles escaping and then it is gone. I think adding a snubber should fix it. Lemme try that later today.
On Tue, Aug 2, 2022, 1:27 AM Niels Jalling < niels@...> wrote: When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver. ?Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20
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On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
If this is caused by an audio device receiving from the wifi, is there a way to turn off the wifi to stop this? ?I tried to turn off the wifi in the menu that has our router listed but it doesn¡¯t kill the sounds. ?That might be operator error¡. There might be a way to shutdown the wifi at a low enough level that there is no interference with the audio system. ?It could be turned on when desired, such as updates or refreshing the time¡.prefer wifi to ethernet but the wifi noise is pretty bad Bob, KO9V?
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On Aug 2, 2022, at 3:16 PM, Bob Losee KO9V via groups.io <Loseeunc@...> wrote:
? I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver. ?Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
You can disable wifi completely by doing it in the /boot/config.tx file.
just edit and add "dtoverlay=pi3-disable-wifi" to the end and reboot.
You can do the command ifconfig before and after to see the wifi interface disappear.
Max
On Tuesday, August 2, 2022, 06:53:37 PM CDT, Bob Losee KO9V <loseeunc@...> wrote:
If this is caused by an audio device receiving from the wifi, is there a way to turn off the wifi to stop this? ?I tried to turn off the wifi in the menu that has our router listed but it doesn¡¯t kill the sounds. ?That might be operator error¡. There might be a way to shutdown the wifi at a low enough level that there is no interference with the audio system. ?It could be turned on when desired, such as updates or refreshing the time¡.prefer wifi to ethernet but the wifi noise is pretty bad Bob, KO9V?
On Aug 2, 2022, at 3:16 PM, Bob Losee KO9V via groups.io <Loseeunc@...> wrote:
? I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver. ?Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f
On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon
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On Aug 2, 2022, at 21:15, Ashhar Farhan <farhanbox@...> wrote:
? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
I have to report failure with the current attempt at eliminating the burp from the LM380. I tried putting a 2.2ohms in series with 0.1uf across the speaker as a snubber. I added a bypass on pin 1. I put a 0.1uf across the input I loaded down the input to 220 ohms. None produced any difference. It is incredible that 2.4 GHz signal of about 1 mw is getting inside an audio IC. Maybe the microwave homebrewers should use LM380 instead of expensive GaAs FETs. I will still chipping away at this interesting problem. - f
We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
Interesting. ? Perhaps it is being demodulates before that? ? Where in the line does it first manifest?
Gordon
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On Aug 4, 2022, at 01:08, Ashhar Farhan <farhanbox@...> wrote:
? I have to report failure with the current attempt at eliminating the burp from the LM380. I tried putting a 2.2ohms in series with 0.1uf across the speaker as a snubber. I added a bypass on pin 1. I put a 0.1uf across the input I loaded down the input to 220 ohms. None produced any difference. It is incredible that 2.4 GHz signal of about 1 mw is getting inside an audio IC. Maybe the microwave homebrewers should use LM380 instead of expensive GaAs FETs. I will still chipping away at this interesting problem. - f We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
The LM380 takes the earphone out from the codec. If you plug in earphones, the LM380 is cut off. There is no buzz in the earphones, but the buzz in the LM380 continues eve though it is not connected to the ear out of the codec. The LM380 is possibly picking it up from the wifi radio that is directly under it, on the raspberry pi. - f
Interesting. ? Perhaps it is being demodulates before that? ? Where in the line does it first manifest?
Gordon ? I have to report failure with the current attempt at eliminating the burp from the LM380. I tried putting a 2.2ohms in series with 0.1uf across the speaker as a snubber. I added a bypass on pin 1. I put a 0.1uf across the input I loaded down the input to 220 ohms. None produced any difference. It is incredible that 2.4 GHz signal of about 1 mw is getting inside an audio IC. Maybe the microwave homebrewers should use LM380 instead of expensive GaAs FETs. I will still chipping away at this interesting problem. - f We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
|
Farhan, try adding a square inch of copper PCB tight against the top of the LM380, earthed. The RF could be getting direct into the silicon die.
Ian McCrum, MI5AFL
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Hi
I may have solved the WiFi noise.
After having seen several schematics for LM380 I discovered that all of them have a 100nF cap in series with a 2.7ohm? from pin 8 to ground. This was not on the sBitx schematics.
Dismantling the sBitx again and study the pcb. No cap and resistor.
I didn't have 2.7ohm but 4.7ohm parallel with 10ohm gives 3.2ohm. I gave it a try.
And result was no strange noise with WiFi connected and no noise when disconnected from my net.
73 de oz9ny, niels
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I tried that as well, it didn't fix it.
On Thu, Aug 4, 2022, 3:12 PM Niels Jalling < niels@...> wrote: Hi
I may have solved the WiFi noise.
After having seen several schematics for LM380 I discovered that all of them have a 100nF cap in series with a 2.7ohm? from pin 8 to ground. This was not on the sBitx schematics.
Dismantling the sBitx again and study the pcb. No cap and resistor.
I didn't have 2.7ohm but 4.7ohm parallel with 10ohm gives 3.2ohm. I gave it a try.
And result was no strange noise with WiFi connected and no noise when disconnected from my net.
73 de oz9ny, niels
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OK. I was a little too fast. I did the test without the top cover. When the top cover is in place the sound is there but the frequency is lower than before.
When the WiFi signal is low the the WiFi -transmitter raises the signal power.
Tomorrow I will build another LM380 amplifier and try placing it away from the WiFi section.
/niels
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Have we made any progress on this noise?? I received my sBitx yesterday, and with the wifi enabled, its unusable due to the transient noises.? As mentioned earlier, adjusting the volume doesn't affect it, nor does having connected or disconnected to the antenna, or whether it's connected to a battery or a power supply.
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I am beginning to think that the wifi signal is injected into another place than the lm380.
I have built an external board with a lm380 and the noise was there.
I have tried placing a grounded screen between the pi and the digital board. Noise.
I have moved the pi to "official mounting" on the backside of the display. Noise.
73 de oz9ny, niels
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Hey All,
The intermittent wifi noise does stop when the wifi is turned off on my sbitx. ?However, when sbitx is simply running (sbitx software not running), there is a constant, low to medium volume, low frequency oscillation that is not affected by audio controls. ?Once the sbitx software is executed, the oscillation is less noticeable.
Is this what you guys are talking about? ?
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If you use the earphones it is not there. This is an LM380 issue.
Hey All,
The intermittent wifi noise does stop when the wifi is turned off on my sbitx.? However, when sbitx is simply running (sbitx software not running), there is a constant, low to medium volume, low frequency oscillation that is not affected by audio controls.? Once the sbitx software is executed, the oscillation is less noticeable.
Is this what you guys are talking about? ?
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