Yes, it is a via to GND. Ramón

#noise #raduino32

Just to confirm, is the upper trace the cap is soldered to the one closest to Y1 that has the through hole?

#noise #raduino32

Hola, There is a defect in the Raduino32 version 6.11 PCB that, in most cases, produces noise that can make the receiver unusable. The problem is that there is no decoupling capacitor in the +3.3v sup

#noise #raduino32

I has a particularly bad problem with the in-line switching power adaptor for my cable modem. I wrapped both the AC power input and DC out cables several turns through large toroids. Then I found a di

#noise #bitx20help #filters #signal

You might try a line interference filter. Might also try shielding the offending interference generator, but might have to consider cooling airflow, so would not be to enclose it in a metal box - woul

#noise #bitx20help #filters #signal

Turn the offending devices off and back on one at a time to determine which one(s) are contributing to the problem. Depending on the nature of that device(s) it should be possible to apply any of seve

#noise #bitx20help #filters #signal

Help! I have a QRM problem if in the vicinity of the bitx there are connected electrical devices such as: swictching power supplies that power hard disk etc ... if I turn off all the QRM disappears Ha

#noise #bitx20help #filters #signal

I am not sure this is related to your problem, but I will share my experience with the BitX40. I found when operating in a car that the radio picked up a lot of alternator whine when the engine was ru

#bitx40 #noise #bitx40help

HI, If the external hard drive is USB powered winding the USB cable several turns through a toroid core may help. Others here may be able to recommend the best ferrite mix number. I bough some from Pa

#bitx40 #noise #bitx40help

Hello I have a disturbance problem on the bitx40 caused by the electrical network. Basically I discovered that an external hard disk connected to 2 meters away, even if in standby, causes noise in the

#bitx40 #noise #bitx40help

Thanks everyone for your help. I'll get on with the suggested task list and let you all know how I'm getting on! Cheers, Jon

#bitx40help #noise

Jon, I always suggest a resistor in series with the center lad of the volume control. 1-10K.. try any value. Raj

#bitx40help #noise

Hi, For best performance, the lm386 should have a bypass capacitor on pin 7. The value is not critical -- any electrolytic from 2-10uF would work. This could easily be added between pin7 and pin4 (gro

#bitx40help #noise

Jon A couple things to look for. Weak power supply (i.e. wallwart). The rig needs a solid 12 volts at 3 or more amperes to service both receive and transmit modes. Ground loops can cause oscillation i

#bitx40help #noise

Try a different speaker too… Sent from Mail for Windows 10

#bitx40help #noise

Try a different power supply also…The one you have may be laying down on the job…Just something easy to try… Is the oscillation a low frequency motorboating or a high frequency squeal?...I also agree

#bitx40help #noise

I don't recall this problem coming up before. Any guess what frequency the oscillation is? If you can't state a frequency, compare it to a typical CW tone, or power line hum, a whistle when calling yo

#bitx40help #noise

Hi all, I'm new to the group and hope you can help! I'm getting an audio oscillation at high volumes on my Bitx40. On turning on, the Bitx is quiet and operating normally, if I turn the volume up, som

#bitx40help #noise

The resistor and capacitor go on the power line to the display. 73 Evan AC9TU

#noise #esp32 #ubitxv6

Gary, That's right, I have a button that disables the screen and if the screen doesn't refresh, the noise goes away. The ESP32 has no way to attenuate the signal but I will test your suggestion of add

#noise #esp32 #ubitxv6