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ubitx v6 lsb/usb

 

I got a ubitx v6 some time ago, and haven't done much with it. I just started tinkering with it. This is the stock firmware.

Changing USB/LSB seems to have no effect. Is there some kind of calibration I need?to do?

Thanks.
Don
 

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
 

Thanks Evan. I think I messed it up when I reloaded the firmware, just to see if I had my Arduino environment?set up correctly.

Where is this 7270 signal? I could really use any signal, like WWV at 10,000 KHz...

On Wed, Jul 10, 2024 at 10:35?AM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:
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

 

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
 

Thanks Evan.

I lack a signal generator, so I'll?have to stick to WWV.
HF is pretty quiet here in Seattle at the?moment. I'll give it a go in a few hours.

On Wed, Jul 10, 2024 at 12:57?PM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:

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
 

Well, I got the frequency dialed in. I can't get the BFO set though. I'm using Friture with a USB mic (on my webcam) laid right on top of the ubitx speaker, and I can't get anything close to the display in Farhan's video. This is about the best I can get. No impact on USB or LSB, both sound the same.
image.png



On Wed, Jul 10, 2024 at 2:39?PM Don Sayler <don.sayler@...> wrote:
Thanks Evan.

I lack a signal generator, so I'll?have to stick to WWV.
HF is pretty quiet here in Seattle at the?moment. I'll give it a go in a few hours.

On Wed, Jul 10, 2024 at 12:57?PM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:

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
 

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 had it set at 11.0581. I didn't see a 'fine' adjustment, but I can look at it tomorrow. I do have a 50mhz scope.


On Wed, Jul 10, 2024, 7:08 PM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:
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

 

That value is too high. ?It should be below 11.057 at most.?
 

I set it to 11.554. Didn't notice any difference in the ubitx. I'll dig out the scope.
I'm sure there's a reference for the Raduino?out there somewhere.

On Wed, Jul 10, 2024 at 10:43?PM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:
That value is too high.? It should be below 11.057 at most.?

 

I sort of remember that the change from USB to LSB or back doesn't take effect until the frequency is changed when using the stock firmware.
 

Ron, that was it! At least I think so...I need to do a little more testing.

There are a lot of repos...is there a preferred 'third-party' firmware for the stock display?

On Fri, Jul 12, 2024 at 4:59?AM Ron Carr via <rcarr=fairpoint.net@groups.io> wrote:
I sort of remember that the change from USB to LSB or back doesn't take effect until the frequency is changed when using the stock firmware.

 

There are a several in the files section of the group. ?I prefer the N8me variant with mods ?
 

Thanks Evan. I like that one too.

I got out my scope. It's an old-fashioned 60 MHz crt-style. It looks like CLK2 tops out my scope...
Results as follows:
CLK2 (Raduino pin 5): 0.2v PP, 60 MHz
CLK1 (Raduino pin 8) 0.3v PP, 40 MHz
CLK0 (Raduino pin 11) 3v PP, 10 MHz

All referenced to pin 12.

Waveforms:
CLK2
image.png

CLK1
image.png

CLK0
image.png


On Fri, Jul 12, 2024 at 11:38?AM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:
There are a several in the files section of the group.? I prefer the N8me variant with mods ?

 

I finally had a chance to 'deep dive' into the clock signals, using the N8ME firmware.

They all seem to be correct, although it appears that the CLK1 frequencies for LSB and USB are switched from what it shows here:

I did the math on CLK2, and the frequency?is what is expected for any given VFO frequency.


On Sat, Jul 13, 2024 at 1:10?PM dsay2001 via <don.sayler=gmail.com@groups.io> wrote:
Thanks Evan. I like that one too.

I got out my scope. It's an old-fashioned 60 MHz crt-style. It looks like CLK2 tops out my scope...
Results as follows:
CLK2 (Raduino pin 5): 0.2v PP, 60 MHz
CLK1 (Raduino pin 8) 0.3v PP, 40 MHz
CLK0 (Raduino pin 11) 3v PP, 10 MHz

All referenced to pin 12.

Waveforms:
CLK2
image.png

CLK1
image.png

CLK0
image.png

On Fri, Jul 12, 2024 at 11:38?AM Evan Hand via <elhandjr=gmail.com@groups.io> wrote:
There are a several in the files section of the group.? I prefer the N8me variant with mods ?

 

Hi Don,
?
Mine does the same. The mode does not change until the frequency changes by a twist of the VFO.
?
73

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