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uBITX v6 Alignment Question

 

In Farhan's video on frequency alignment he uses a 40m AM signal to zero beat too.? Does it have to be a 40m signal?? Can't I use WWV at 10 MHz?? Or for that matter, adjust to a known signal, e.g., the Noon-Time-Net that meets everyday at 7,284 MHz.? Tuning to that LSB signal until I hear the best audio.? Just curious.? I'm going for an alignment later today.? I'll worry about the low audio another day, probably after the holidays.? Thank you all, 73 Richard AG5M
Re: ?Bitx concept as a pure receiver

 

Thanks Bernard .
Re: ?Bitx concept as a pure receiver

 

An on off switch to switch off and on the display seems to be good as it will save?
The battery.

Best regards

Sunil vu3sua
Re: ?Bitx concept as a pure receiver

 

The idea is to have connectors at certain places where you can experiment with a wide variety of agc and other circuits .
It would be fun to try different circuits and combinations and see what works best .

If we make a particular agc then we would be stuck with that working only .
This receiver would be an a experiment set up where you try things say like? Lego board. We can try different agc ideas with independent boards that can be attached to the Receiver.

There are already many receivers in the market so the idea is to construct and? experiment and not to think we are buying another Receiver .

The receiver will be evolving with new ideas as we will make in small lots . As soon as we have some new features we can update the pcb .

I hope you all have got the idea what this project is about .

There are other firmwares which we can try out too.

I think it's become too long ?

Best regards.

Sunil vu3sua


?
Re: uBITX v6 Low Audio Update 11-23-24

 

I thought I posted this yesterday, but don't see it.? Apologies if this is a duplicate.
?
It appears (to me) that the way K3 is drawn in the schematic is misleading.? Shouldn't M2 and M3 be connected during receive and open during transmit?? If so, don't overlook K3's normally closed contacts as a possible culprit.
?
? ?
?
Cheers,
Don
Re: ?Bitx concept as a pure receiver

 

Hello Bernd,
I took the uBitx V6 schematics and crossed out all parts, that are not required for a receiver, to give you an idea on the complexity reduction.?
--
73, Joerg - DB2OO

ubitxv6_RX_only.pdf
ubitxv6_RX_only.pdf

Re: ?Bitx concept as a pure receiver

 

1602 displays are much cheaper although you do not have refinements such as downfall for band activity display as on the Nextion etc
Consider having the display switching off after a predetermined customer selectable time or simply manually.
Perhaps NBFM as RX can be used with VHF/UHF converters on 28MHz.
Ideas coming to my mind as I read the?emails.
Good day.
Lawrence.?

On Mon, Nov 25, 2024 at 12:03?PM Sunil Lakhani via <vu3sua=gmail.com@groups.io> wrote:
We can use Ian Lee's firmware for 1602 Display or Nextion Display .
There are other firmwares but I have not tried any of them as yet .?

Regards

Sunil vu3sua
Re: ?Bitx concept as a pure receiver

 

Have you considered such things as an RF amplifier, rf derived AGC etc
Regards


On Mon, Nov 25, 2024 at 12:05?PM Sunil Lakhani via <vu3sua=gmail.com@groups.io> wrote:
Thanks Jim .

I appreciate your support .

The pcb is about ready but some final add ons are to be added to finish the pcb.

Best regards

Sunil vu3sua
Re: ?Bitx concept as a pure receiver

 

Thanks Jim .

I appreciate your support .

The pcb is about ready but some final add ons are to be added to finish the pcb.

Best regards

Sunil vu3sua
Re: ?Bitx concept as a pure receiver

 

We can use Ian Lee's firmware for 1602 Display or Nextion Display .
There are other firmwares but I have not tried any of them as yet .?

Regards

Sunil vu3sua
Re: uBITX v6 Low Audio Update 11-23-24

 

I came across two units where the 45m15. Has deteriorated.agter changing them rig was restored. This could be of some help.
?
Sarma vu3zmv?
Re: Specan Revisited Noise floor

 

Very good! I hope you take a crack at the user interface as well


On Mon, Nov 25, 2024, 12:12 AM Nigel Maund via <maund.n=gmail.com@groups.io> wrote:
I shielded the 100 MHz oscillator and this reduced all noise issues.? The oscillator is as spraying into the power lines.
Re: uBITX v6 Low Audio Update 11-24-24 11:45 AM

 

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In the version six, and potentially in other versions as well, the CW side tone is injected before the volume control and final audio amplifier. So I believe those can be ruled out.

As others have pointed out if the BFO is way out of alignment that needs to get fixed pronto.

Gordon?


On Nov 24, 2024, at 19:07, Gordon Gibby KX4Z via groups.io <docvacuumtubes@...> wrote:

?
The fact that the SIDETONE is loud -- is a clue.? ?Look and see where it gets injected into the system.? ?Since everything after that is working, the problem is BEFORE where the sidetone gets injected.? ? ? Try breaking the stages down and bydeductive reasoning, or by monitoring (since this is an intermittent problem) -- find the place where the signal seems to dwindle.? ?So far, it appears to be BEFORE where the side tone?gets injected.? Is the volume control before?that?



My 2 cents
gordon KX4Z



On Sun, Nov 24, 2024 at 6:53?PM Alan Cooper via <cqw7aln=gmail.com@groups.io> wrote:

Have you tried replaceing the volume pot.... sure seems like its something close in there where you are poking it around, and a major symptom seen to be an inntermitant thing like a loose connection somewhere.


On Sun, Nov 24, 2024, 11:43?AM Richard AG5M via <ag5m=yahoo.com@groups.io> wrote:
Thank you guys, a brief update, and I'll summarize later into one message. But for now based on new suggestions:

Probing, flexing the board, touching diodes, other components, BNC connector, etc., all nothing. Tapping everything, everything seems solid. And I used it this morning to check into the NTN on CW and SSB. So it's working fine in that regard. Good RX TX, no issues with coax, antenna, etc. Only weak audio output.

It is off frequency, NTN is on 7.284.00 My display is on 7.282.50. Have not aligned the BFO yet as was suggested. Will get to that.

I'm using headphones and Vol is wide open. I do hear a LOUD crackle from time to time like the audio is trying to come back. Touching points listening for hum...

TP1 - nothing
TP2 - nothing
TP3 - can't find yet
TP20 - nice loud hum
TP21 - very weak hum
Gate of Q74 - nothing
Pin 2 P2 - nothing
Pin 3 of U1 - loud hum, higher pitch than base of Q70
Base of Q70 - loud hum, tone is different than Pin 3 U1

Still have not found D3 or D4. Board is out of its case on my bench.
WOW! Just blasted me out of my chair for a second or two, then audio died again. Hear crackles from time to time, something intermittent, it's trying to come back.

And is there a CW sidetone adjustment on the board? On CW, about blows my ears off. Audio is sure working in that regard.

73, Richard AG5M


On Sunday, November 24, 2024 at 12:57:12 AM PST, tomekdm sp7etd via <tomekdm=interia.pl@groups.io> wrote:


Ok. I missed some previous messages. Is it not continued, same topic?
Anyway, Do You have the same level of noise/hum while touching core of antenna connector and pin2 of P2 (or, TP1, TP2)?
Is Your antenna and cable confirmed with other transceiver?
?
Regards
Tomasz

Re: uBITX v6 Low Audio Update 11-24-24 11:45 AM

 

The fact that the SIDETONE is loud -- is a clue.? ?Look and see where it gets injected into the system.? ?Since everything after that is working, the problem is BEFORE where the sidetone gets injected.? ? ? Try breaking the stages down and bydeductive reasoning, or by monitoring (since this is an intermittent problem) -- find the place where the signal seems to dwindle.? ?So far, it appears to be BEFORE where the side tone?gets injected.? Is the volume control before?that?



My 2 cents
gordon KX4Z



On Sun, Nov 24, 2024 at 6:53?PM Alan Cooper via <cqw7aln=gmail.com@groups.io> wrote:

Have you tried replaceing the volume pot.... sure seems like its something close in there where you are poking it around, and a major symptom seen to be an inntermitant thing like a loose connection somewhere.


On Sun, Nov 24, 2024, 11:43?AM Richard AG5M via <ag5m=yahoo.com@groups.io> wrote:
Thank you guys, a brief update, and I'll summarize later into one message. But for now based on new suggestions:

Probing, flexing the board, touching diodes, other components, BNC connector, etc., all nothing. Tapping everything, everything seems solid. And I used it this morning to check into the NTN on CW and SSB. So it's working fine in that regard. Good RX TX, no issues with coax, antenna, etc. Only weak audio output.

It is off frequency, NTN is on 7.284.00 My display is on 7.282.50. Have not aligned the BFO yet as was suggested. Will get to that.

I'm using headphones and Vol is wide open. I do hear a LOUD crackle from time to time like the audio is trying to come back. Touching points listening for hum...

TP1 - nothing
TP2 - nothing
TP3 - can't find yet
TP20 - nice loud hum
TP21 - very weak hum
Gate of Q74 - nothing
Pin 2 P2 - nothing
Pin 3 of U1 - loud hum, higher pitch than base of Q70
Base of Q70 - loud hum, tone is different than Pin 3 U1

Still have not found D3 or D4. Board is out of its case on my bench.
WOW! Just blasted me out of my chair for a second or two, then audio died again. Hear crackles from time to time, something intermittent, it's trying to come back.

And is there a CW sidetone adjustment on the board? On CW, about blows my ears off. Audio is sure working in that regard.

73, Richard AG5M


On Sunday, November 24, 2024 at 12:57:12 AM PST, tomekdm sp7etd via <tomekdm=interia.pl@groups.io> wrote:


Ok. I missed some previous messages. Is it not continued, same topic?
Anyway, Do You have the same level of noise/hum while touching core of antenna connector and pin2 of P2 (or, TP1, TP2)?
Is Your antenna and cable confirmed with other transceiver?
?
Regards
Tomasz

Re: uBITX v6 Low Audio Update 11-24-24 11:45 AM

 

Have you tried replaceing the volume pot.... sure seems like its something close in there where you are poking it around, and a major symptom seen to be an inntermitant thing like a loose connection somewhere.


On Sun, Nov 24, 2024, 11:43?AM Richard AG5M via <ag5m=yahoo.com@groups.io> wrote:
Thank you guys, a brief update, and I'll summarize later into one message. But for now based on new suggestions:

Probing, flexing the board, touching diodes, other components, BNC connector, etc., all nothing. Tapping everything, everything seems solid. And I used it this morning to check into the NTN on CW and SSB. So it's working fine in that regard. Good RX TX, no issues with coax, antenna, etc. Only weak audio output.

It is off frequency, NTN is on 7.284.00 My display is on 7.282.50. Have not aligned the BFO yet as was suggested. Will get to that.

I'm using headphones and Vol is wide open. I do hear a LOUD crackle from time to time like the audio is trying to come back. Touching points listening for hum...

TP1 - nothing
TP2 - nothing
TP3 - can't find yet
TP20 - nice loud hum
TP21 - very weak hum
Gate of Q74 - nothing
Pin 2 P2 - nothing
Pin 3 of U1 - loud hum, higher pitch than base of Q70
Base of Q70 - loud hum, tone is different than Pin 3 U1

Still have not found D3 or D4. Board is out of its case on my bench.
WOW! Just blasted me out of my chair for a second or two, then audio died again. Hear crackles from time to time, something intermittent, it's trying to come back.

And is there a CW sidetone adjustment on the board? On CW, about blows my ears off. Audio is sure working in that regard.

73, Richard AG5M


On Sunday, November 24, 2024 at 12:57:12 AM PST, tomekdm sp7etd via <tomekdm=interia.pl@groups.io> wrote:


Ok. I missed some previous messages. Is it not continued, same topic?
Anyway, Do You have the same level of noise/hum while touching core of antenna connector and pin2 of P2 (or, TP1, TP2)?
Is Your antenna and cable confirmed with other transceiver?
?
Regards
Tomasz

Re: uBITX v6 Low Audio Update 11-24-24 11:45 AM

 

Hi Richard,
?
If the dial frequency is off, then do the full calibration steps in the video
?
This will also help with receiver sensitivity.?

73
Evan
AC9TU

Re: uBITX v6 Low Audio Update 11-24-24 11:45 AM

 

Thank you guys, a brief update, and I'll summarize later into one message. But for now based on new suggestions:

Probing, flexing the board, touching diodes, other components, BNC connector, etc., all nothing. Tapping everything, everything seems solid. And I used it this morning to check into the NTN on CW and SSB. So it's working fine in that regard. Good RX TX, no issues with coax, antenna, etc. Only weak audio output.

It is off frequency, NTN is on 7.284.00 My display is on 7.282.50. Have not aligned the BFO yet as was suggested. Will get to that.

I'm using headphones and Vol is wide open. I do hear a LOUD crackle from time to time like the audio is trying to come back. Touching points listening for hum...

TP1 - nothing
TP2 - nothing
TP3 - can't find yet
TP20 - nice loud hum
TP21 - very weak hum
Gate of Q74 - nothing
Pin 2 P2 - nothing
Pin 3 of U1 - loud hum, higher pitch than base of Q70
Base of Q70 - loud hum, tone is different than Pin 3 U1

Still have not found D3 or D4. Board is out of its case on my bench.
WOW! Just blasted me out of my chair for a second or two, then audio died again. Hear crackles from time to time, something intermittent, it's trying to come back.

And is there a CW sidetone adjustment on the board? On CW, about blows my ears off. Audio is sure working in that regard.

73, Richard AG5M


On Sunday, November 24, 2024 at 12:57:12 AM PST, tomekdm sp7etd via groups.io <tomekdm@...> wrote:


Ok. I missed some previous messages. Is it not continued, same topic?
Anyway, Do You have the same level of noise/hum while touching core of antenna connector and pin2 of P2 (or, TP1, TP2)?
Is Your antenna and cable confirmed with other transceiver?
?
Regards
Tomasz

Re: Specan Revisited Noise floor

 

I shielded the 100 MHz oscillator and this reduced all noise issues. ?The oscillator is as spraying into the power lines.

Re: ?Bitx concept as a pure receiver

 

Hi Sunil,
I will be a customer for the RX kit.? When that is available I will place an order for at least two.
I think it will be a great product.
Thank You and Good DX !
Jim WB4ILP?

Re: ?Bitx concept as a pure receiver

 

Hello
?
The version whether 3.0 or 6.0 would be the same to me.
The frequency of the 2nd IF was changed once and the AF part.
I would definitely try this
as a double super with two conversions to
45Mhz and 12Mhz or 11.059Mhz
The question is which components need to be removed
or can be saved.
Which software runs on the Arduino/Raduino and which display is secondary for me.
is of secondary importance to me. But I have everything here in my component box
?
Greetings Bernd

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