开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. BITX20
  2. Topics

zBitx speaker noise? #zbitx

 

I hear a pulsing noise from my zBitx speaker, even with a dummy load connected instead of an antenna, and both the audio volume and IF gain turn down. Seems to pulse or hum 3 to 5 times per second. Is this normal? ?Or an issue that needs to be fixed?
?
Anyone else hear this from their unit?
?
If it’s a problem with my unit, any ideas on where I should I look to diagnose and solve this noise issue?
?
73, Ron
 

I think this effect is due to its very small size. Probably shielding would eliminate the problem.
This could be aluminum or copper foil, which is insulated on both sides. Short circuits should be avoided.
If you feel like it, you can experiment with this.
This worked for sBitx, when the RPi flat display wire is shielded and a similar metal shield is placed between the pcb and the RPi.
The question is, which is the better shield: aluminum or copper or iron?
--
Gyula HA3HZ
 

Ron,
?
I have that same problem, in fact I would say every zBitx owner is having this problem. There are some on this group that think this might be the SPI serial interface updating the display and causing interference. It may be reduced somewhat through firmware changes like how many writes to refresh the display and such. Me not being a coder by any means am waiting to see what others come up with to fix this annoying problem. All we cane do is wait and see.
?
Joel
N6ALT
 

开云体育

I agree ... -
?
I use self-adhesive copper tape to shield the lines.
This also allowed me in the past to get the sBitx free of digital interferences.
The HF signal transceivers all have the same problem of insufficient or complete no shielding of the digital units.
?
73 ! Jens / HB9JOI
?
+++
?

From: Joel Caulkins/N6ALT via groups.io
Sent: Tuesday, April 15, 2025 4:39 PM
Subject: Re: [BITX20] zBitx speaker noise? #zbitx
?
Ron,
?
I have that same problem, in fact I would say every zBitx owner is having this problem. There are some on this group that think this might be the SPI serial interface updating the display and causing interference. It may be reduced somewhat through firmware changes like how many writes to refresh the display and such. Me not being a coder by any means am waiting to see what others come up with to fix this annoying problem. All we cane do is wait and see.
?
Joel
N6ALT
 

I noticed similar noise

If i tune to any freq, I hear chugging noise.
If i go to the menu or any where there is no waterfall displayed, the noise disappears.

So for me it is the water fall causing the noise.

A simple solution which would help is a button to turn or off the water fall.
Other shielding might help, but trun off water display makes a huge?difference.

Thanks.

Joe?
VE1BWV?

On Tue, Apr 15, 2025, 7:02?a.m. HA3HZ via <gyula=[email protected]> wrote:
I think this effect is due to its very small size. Probably shielding would eliminate the problem.
This could be aluminum or copper foil, which is insulated on both sides. Short circuits should be avoided.
If you feel like it, you can experiment with this.
This worked for sBitx, when the RPi flat display wire is shielded and a similar metal shield is placed between the pcb and the RPi.
The question is, which is the better shield: aluminum or copper or iron?
--
Gyula HA3HZ

1 - 5 of 5