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Don,

This looks like the "course" BFO setting used to zero beat the AM signal.? Note that there is little to no signal above 1.8 KHz.? What values are you entering when you press the tuning knob?? If you look closely at the video, you will note that Farhan has set it to 11.056 for the course adjustment, and then for the final adjustment, it is 11.0554.? your values should be close to these.

There have been reports of the Raduino Si5351 failure causing similar issues.? To test it, you need a scope or frequency counter to verify the three clock signals.

73
Evan
AC9TU

I think it would great to have VHF/UHF/SHF sBitx.? Maybe a poor man's version of the ICOM IC-9700?? A gBitx?

Thanks to JJ my homebrew sBitx is now up and running on the 64 bit release and all is well.? I'm going to be testing over the next few days but I will likely keep it.? The 64 bit OS feels like the future and JJ and team have done a nice job with fixing some niggling problems and adding capabilities.

While testing the 64 bit release I began having an intermittent issue where the Tx relay would randomly switch - sometimes just once and sometimes it chatter like a machine gun.? Pete, N6QW helped me figure it out - it was a leaky transistor.

Details and a video showing the 64 bit build in action on my blog'



73,
Dean
KK4DAS

On Tue, Jul 9, 2024 at 02:06 PM, Kb4yho wrote:

Dont need “what worked for me” comments.
Whats the solution?

Could you post a picture of your waterfall with the noise?? Maybe with the band spread set to 25K with a dummy load or no antenna attached?

I mean if you have your IF GAIN cranked to 100% on 40M or 80M you might have a lot of noise.? But, that would be true of a lot of radios.

I did replace my 5V regulator and that did help reduce some of the background noise.? But, my V3 is pretty quiet and has a great sounding receiver.

I'm sure the Raspberry PI sitting next to the receiver front end does produce some noise.? But most SDR's have a computer of some sort inside.

Don,
The signal that Asher Farhan is using is a short wave station in India. ?Any AM signal can be used. ?I use a 10MHz reference source. ?You can also use a frequency generator. ?WWV can work. ?It has the tones that can make finding the zero beat hard. ?Note that a higher frequency is better than a low frequency. ?

73
Evan
AC9TU

Hi Don,

The radio's calibration may be off.? The radios are calibrated in the factory, so the following should be done carefully.? Unfortunately, the stock software does not know the current calibration values.? Other choices display the current settings in the group's files section.

There is a video from Ashhar Farhan on how to celebrate the V6:


The BFO tuning aid no longer works.? Instead, you will need to use a free PC-based audio spectrum analyzer like one of these"



The red lines on the tuning aid are 300 and 3,000 Hz.

I suggest you record the values you save as a starting point for future tuning.

73
Evan
AC9TU

Gulya, you’re one of the heavy hitters here so your response is interesting. I appreciate the attempt at constructive criticism.
Your inference seems to make this about me.

I much prefer to stay on the topic.

Ive been in contact with HFSignals. Not sure of your affiliation but you may get the same info.

Asked to submit data on the internal interference observed. Video’s and details sent.

Frankly these SBITX are up to a V3 and in my opinion there’s still basic hardware integration issues.

Analog RF chain next to an unshielded Pi4 and display. What did you think was going to happen?
I purchased my V3 for stand alone ops and possible Linux refresher. Unfortunately I’m having to spend time on troubleshooting and conversations such as this. Not what I intended, but here we are.

Welcome to sBitx owners.
It seems to me that you have little knowledge of what HF ??Signals does that is worth knowing. What I know, I've read online.
In the beginning there was Minima, then the Bitx variants and now sBitx and its further simplification.
The designer strives for simple solutions, which customers accept by adding their own ideas.
This can be a hardware or software solution.
The current disclosure may be too mystified, but it needs to be addressed in its place. There are no miracles
If you handle things as well as you write in your introductory message, you can start improving the operation.
Before you start, please read more on the forum, because some people have already done a lot to make the device more usable.
In short, that's it.
--
Gyula HA3HZ

On Sun, Jul 7, 2024 at 08:53 AM, Dean Souleles wrote:

On Sat, Jul 6, 2024 at 01:18 PM, JJ - W9JES wrote:

Check your system time. No decodes if the time is off by a significant degree

Thanks, JJ.?

For anyone following... The issue is my homebrew rig does not have an RTC. So as long as you have nrtc you should be good to go.?

73,
Dean
KK4DAS?

All -?

v3.026 is now available for installation.



Change list:

• sBitx app now selects the RTC and reads it if present or copies the system time if no RTC is present.
• hamlib NET RigCtl is now more robust for dropped or restarted connections.
• CW modem polling has been updated.

To get this update, open terminal and type:

cd sbitx
./update



-JJ

We feel your pain...

Thank you both for the great info!?

once things slow back down again, I’ll get to work on figuring it out

I have video of this issue but it won’t fit here.

Purchased a V3 from a ham on QTH. Told it was 2 weeks old and it’s of course built and tweaked at the factory.

S/N 0994 so someone could ascertain it’s true build date.

It has several issues but the most glaring one is internal receiver noise.

Read all the forums, blogs, etc.

5v Buck boost module has a systemic problem. As some users units exhibit the exact issue I’m observing. I’m guessing some V3’s work or there would be more of a footprint here on this issue.

Tried adding of the suggested caps on the enable line also on the input and outputs of the 5v bb module. Slight if any improvements. Still unusable on 40 meters. Its absolutely worst there.

Purchased the suggested Drok module. Still problematic. Used RC low pass on the output. Some improvement but come on.

Im spending too much time on the hardware as I purchased this to help my Linux bone.

No issues updating the V3 or Pi configuration. Some struggle with the time zones correctly being displayed. No problem as having Linux experience helped.

Is there anyone who has a handle on this internal noise problem??

Dont need “what worked for me” comments.
Whats the solution?

Should be relatively easy for the folks who designed this to weigh in and implement a hard fix.?

Not complaining just need pertinent help.

Many other issues with this radio that more than likely can be fixed via the code.

AGC after unkey hangs to long except when AGC is off. Easy fix.

No S meter. Should be able to implement that via code.?

Of course the screen resizing for WJST etc.
Just to mention the obvious.

Anyway if your going to buy one of these and aren’t ready to deal with these problems?
stay away until it’s more mature. Both hardware and software.

Im just trying to get it function hardware wise before starting any major code experiments.