Date   
Re: Output change.

Ashhar Farhan
 

turn down the RV1
- f

On Sat, Jun 8, 2019 at 8:32 AM Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
My v4 is a bit below 5w on 40m, but I digress.

First, consider accuracy of your power meter. I won't swear my wm2 is perfect. Some instruments seem to over estimate power a bit.

Possibly your v5 might be doing a couple extra watts. Don't have schematic in front of me, but there is a pot on the board to dial back drive. Hint it is not the 2 pots that adjust bias for clean ssb! Its the one other one. Make sure you tweak the correct pot. My android isn't good at multi tasking, you should figure this out.

Curt

Re: V5 audio Help !

Mike Kilpatrick
 

I’m very new to all this but I’ve twice had the no audio except for encoder clicks. 

First time I found that I had actually lost RF input due to a faulty BNC antenna connector.  Wiggling the coax revealed this. 

The second time I don’t know what caused it but I recovered audio by reloading the V5 firmware. Sounds easy but a nightmare for me 😀

Now I can’t get the unit to retain calibration and BFO settings. 
I guess it really is educational 😀


On 8 Jun 2019, at 15:14, "chuckr@..." <chuckr@...> wrote:

Hi, as mentioned first symptoms was the sudden drop in audio to near nothing after an attempt to wire audio to the mike plug ( second round four pin connector) for digital use. All was working fine until this point , I think i may have caused the Vol-H to get grounded. I have reversed all that I was doing and all wiring etc. to where it was last working at which time the audio would adjust so loud that one would have to cover their ears. For a day or so the audio was  still barely there and you could still tune around . as time went and I tried two lm386 and now the audio is completely gone except for the low clicking of the encoder as it turns.
All i have for testing is a multi-meter. I have checked all wiring for continuity. The radio still tunes and transmits as when it was new a couple weeks ago. I know this info is lacking and not really very tech but I will try to answer / our questions etc.
Thanks much
chuck

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Ian Reeve
 

Hi Eric, Are you using the enhanced version.The basic version won't work.A tft file can be copied directly to a married card and installed but the basic version of the ft will return a error


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 9:49:40 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Derek,

I have the Nextion 3.2" model NX4024K032_011R. I have not had any success updating the firmware to my display. I tried the TFT and HMI files. Do you have any suggestions as to what to try to resolve this?

Eric Carter 

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Vic WA4THR
 

I am using the 2.8 Nextion. Initially I had cut the opening to fit the glass surface and then noticed not just that the surface had unused area, but more important the illuminating LED was shining light from the right side. My solution was to get a bezel that covered more of the right side. In retrospect, it would have been better to cut the original opening smaller and shimmed the Nextion display to fit behind the panel exposing the same area that was allowed with the bezel.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Eric Carter
 

Hi Ian,

My display is a basic version. Unfortunately, I did not know the limitation of the basic units.. I originally purchased it for my Raspberry Pi 3 B+. That may also explain the difficulty I had in getting it to work with the Raspberry 3 B+ as well.  I will order an enhanced version.

Thanks for the advice.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Ian Reeve
 

Hi Eric,

There are certainly differences but I have successfully loaded the KD8CEC tft file to the screen and it all works.

I have also just increased the screen to a 3.5” from a 2.8”,again a basic screen and the appropriate tft file installed just fine.

 

Is yours a genuine Nextion as there are Chinese copies.

 

I used a brand new microsd card as I understand that there can only be the one file you need on it.

 

Good luck! This sort of activity is a steep leaning curve!

 

73

 

Ian M0IDR

 

 

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 10:13:26 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Ian,

My display is a basic version. Unfortunately, I did not know the limitation of the basic units.. I originally purchased it for my Raspberry Pi 3 B+. That may also explain the difficulty I had in getting it to work with the Raspberry 3 B+ as well.  I will order an enhanced version.

Thanks for the advice.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Eric Carter
 

Hi Ian,

I just finished loading the firmware by using  the Nextion editor and my PC. The display was delivered in a Nextion box and the model number matched. If it is a fake, the seller certainly went all in. The display shows what I should expect, but it doesn't react to the tuner inputs. 

I will keep trying until the new one arrives. The radio isn't in a case yet. I ordered a Cheval case and it will take some time to arrive.

Cheers,
Eric


On Sat, Jun 8, 2019, 11:43 Ian Reeve <ian.radioworkshop@...> wrote:

Hi Eric,

There are certainly differences but I have successfully loaded the KD8CEC tft file to the screen and it all works.

I have also just increased the screen to a 3.5” from a 2.8”,again a basic screen and the appropriate tft file installed just fine.

 

Is yours a genuine Nextion as there are Chinese copies.

 

I used a brand new microsd card as I understand that there can only be the one file you need on it.

 

Good luck! This sort of activity is a steep leaning curve!

 

73

 

Ian M0IDR

 

 

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 10:13:26 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Ian,

My display is a basic version. Unfortunately, I did not know the limitation of the basic units.. I originally purchased it for my Raspberry Pi 3 B+. That may also explain the difficulty I had in getting it to work with the Raspberry 3 B+ as well.  I will order an enhanced version.

Thanks for the advice.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Ian Reeve
 

Hi,

All these screens have a unused vertical portion of approx. 4mm on the right hand side where the connections come in from the pcb.

Mounting it with the aperture exactly the same as the glass screen size will as Vic says leave a black portion on the right.

Making a bezel to just show the usable area is the answer and I cheated and used some matt black stiff card (from a art supplier)

The screen is then spaced slightly away from the front panel to allow the card bezel to fit immediately behind the panel.

 

So order of assembly :

Immediately behind front panel card bezel suitably cut out for usable glass area and punched for mounting holes

Four spacers of a few mm depth to distance the display evenly

The display itself

Washer

Fixing nut

 

Of course you are left with the display very slightly off centre but looks presentable.

 

The best solution would to be to design and print a 3D plastic bezel that could cover the aperture and then use countersunk screws to fix the screen.

 

All part of the fun of home brew!

 

73

 

Ian M0IDR

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Vic WA4THR via Groups.Io <vhklein@...>
Sent: Saturday, June 8, 2019 10:05:40 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
I am using the 2.8 Nextion. Initially I had cut the opening to fit the glass surface and then noticed not just that the surface had unused area, but more important the illuminating LED was shining light from the right side. My solution was to get a bezel that covered more of the right side. In retrospect, it would have been better to cut the original opening smaller and shimmed the Nextion display to fit behind the panel exposing the same area that was allowed with the bezel.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Ian Reeve
 

I used a bre-built tft file from KN4UD which was detailed on the hf signals website.

I have not tried using the Nextion editor but I guess if you have the image there the upload must have been successful.

 

I did have a problem similar to yours and the blue lead to the 4 pin connector was not making contact and therefore I had the display but the data from the rig would not transfer.

 

The connections from the Arduino to nextion are:

 

 

 

Top Left of Arduino plug in board

 

Black, Red,NC,Blue,NC,Yellow

 

The NC are spaces so black,red,space,blue,space,yellow

 

Good Luck.

 

Ian M0IDR

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 11:12:30 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Ian,

I just finished loading the firmware by using  the Nextion editor and my PC. The display was delivered in a Nextion box and the model number matched. If it is a fake, the seller certainly went all in. The display shows what I should expect, but it doesn't react to the tuner inputs. 

I will keep trying until the new one arrives. The radio isn't in a case yet. I ordered a Cheval case and it will take some time to arrive.

Cheers,
Eric


On Sat, Jun 8, 2019, 11:43 Ian Reeve <ian.radioworkshop@...> wrote:

Hi Eric,

There are certainly differences but I have successfully loaded the KD8CEC tft file to the screen and it all works.

I have also just increased the screen to a 3.5” from a 2.8”,again a basic screen and the appropriate tft file installed just fine.

 

Is yours a genuine Nextion as there are Chinese copies.

 

I used a brand new microsd card as I understand that there can only be the one file you need on it.

 

Good luck! This sort of activity is a steep leaning curve!

 

73

 

Ian M0IDR

 

 

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 10:13:26 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Ian,

My display is a basic version. Unfortunately, I did not know the limitation of the basic units.. I originally purchased it for my Raspberry Pi 3 B+. That may also explain the difficulty I had in getting it to work with the Raspberry 3 B+ as well.  I will order an enhanced version.

Thanks for the advice.

Re: no audio

Lawrence Galea
 

You do not start from the mixer.
You start from the audio output stage
Try injecting audio backwards from the audio output stage.
If you get audio out the output stage is OK
Then move backwards to the mixer testing each stage at a time and as long as you have output the stages following your test point will be working.
When you have no audio from a test point the fault will be between that point and the previous test point.
Regards
Lawrence

On Sat, Jun 8, 2019 at 4:29 AM Sam Tedesco <stedesco619@...> wrote:
Tried injecting audio. No go. I might have to venture before the mixer. I'm lost on this one

Re: V5 audio Help !

Evan Hand
 

Without a way to measure RF it will be a challenge.  I would look into an oscilloscope, one that goes up to 100MHz as your next investment.  It can be used to measure the clock frequencies that seem to be one of the major factors in getting the uBitx to work properly.

With that being said, start by verifying all of the RX voltages (pull out the schematic to follow) at R10, R30 and R52. This should be done on both sides of the resistors to insure one of them is not fried.  Assuming that all check out, next isolate if the issue is on the audio or RF side of the rig.  I do this with a simple screwdriver (small tip) touching to the center volume control tab.  You should hear a 60 Hz (assuming US) hum through the speaker.  If this works, then the problem is upstream in either the preamp or RF/demodulater sections, and the troubleshooting becomes more difficult without some way to verify frequency.  One possible way to test sections is to take the antenna connection off and then on and see if the "noise" level changes.  You can do this on later IF stages as well by using a jumper from the antenna center wire to each of the test points starting with TP1, TP13, TP14, TP16, TP17, TP20 and TP21.  You should have a difference in noise level when touching vs not touching the TP.

If the "noise" signal injection test above verifies that all sections are working, then you most likely have a calibration issue with the BFO.  There are a number of threads on this group that can give you instructions on how to do that with both the original and other versions of firmware.  I would search for BFO calibration using the search function at the top of the page.

Try the above and report back to this group your results.  in the meantime there may be another better expert that can offer some advice.

Good Luck and Happy Hunting :-)
73
Evan
AC9TU

Re: Output change.

Evan Hand
 

As Ashhar stated, RV1 can be adjusted to lower the drive to the finals.  Be careful on adjusting back up, as you can overdrive and have distortion in the signal.  i would reccomend that you measure the power out at a set frequency into a dummy load, note the value, and then lower to less than 5 watts. To reverse, go back to the dummy load and frequency and reset to the noted value.

FYI, The power adjust is not consistent across all bands.  Setting for 5 watts on 40 meters will not be 5 watts on 80 or 20 meters.  I assume that you are either going to use the CW mode to set the power level, or you have a tone generator (preferably 2 tone) to set the power on SSB.

Hope the above helps.  Good luck on your sprint.

73
Evan
AC9TU

Re: V5 audio Help !

_Dave_ K0MBT
 

If you have moved the calibration it can throw the bfo calibration off to make the audio almost disappear. Check the bfo for standard calibration. I found on one broken ubtix the bfo was about 2kc off and I couldn't hear much at all.

What are you powering the radio with?

Re: V5 audio Help !

Evan Hand
 

You can also follow this thread, as he is having the same issue.

https://groups.io/g/BITX20/topic/31971766#69562

Having been on this board for over 6 months reading every day, I can say that there is a lot of repeat calls for the same problem.  I would suggest searching the threads for your symptoms for other help as well.  Also, I know that I have got confused between threads/requests for help as to what has been tried already because there are usually more than one similar problems being reports at the same time.  Right now there are two threads with no audio active.

Please do not take this as a criticism of your actions,  The only stupid question is the one not asked.  I am trying to give you other options to get help.

FWIW
73
Evan
AC9TU

Re: Output change.

Don, ND6T
 

I converted a power supply so that it now has a panel voltmeter and installed a voltage control on the front panel. Now when I need to adjust RF output a bit lower I can drop it quickly by lowering the supply. This works nicely on uBITX, BITX, and on my KD1JV SB2s.
73, Don

Simple construction idea

Jack Purdum
 

All:

I've been working with a small (2.4") TFT touch screen display for a CW messaging system. The display has 14 pins on the right edge of the display, with their ID's silk screened on the back side of the display. During the course of building the circuit, I probably flipped the display front-to-back...oh, I don't know...about a bazillion times. Al (AC8GY) had a great , but simple, time-saving idea, as shown here:

Inline image

He cut some scrap from an Avery label sheet and just stuck it on the display. Well worth the effort for almost any device that has silk screening on the back but you need to work with it from the front. If need be, it's easy to peel the label off when you're done.

Jack, W8TEE

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Eric Carter
 

Hi Ian,

I checked the resistance and continuity of the connections with a multimeter and found no issue. Bummer. I wish it could have been that simple. I am beginning to wonder if there is a problem with the Nextion display itself.

Regards,

Eric

Re: no audio

Sam Tedesco
 

I started at the output and have been working backwards. Changed a few transistors on the amp stage. Just checked preamp. No audio to be found. On to the mixer. My dad has a nice audio injector that I need to try. My setup is a little cumbersome. So far, voltages seem fine to amp

uBITx v5 - with mods

Ravi Miranda
 

Hi All,

Apologies for the long post.

Background
I built a V5 using the circuit here:
http://www.hfsignals.com/wp-content/uploads/2019/02/ubitx_v5.pdf

I have also included the mods (BFR106) and changed the resistors as
specified. Only the RX stage has been enabled.
For the stages I used :
http://w7zoi.net/bidirectional_matched_amplifier.pdf keeping the
original values intact

The ladder crystal filter has been built with 11.0592 Mhz Crystals.

The voltages for the RX side (only) transistors are as follows:
Q10 [C] (9.33) [B] (2.02) [E] (1.31)
Q11 [C] (11.69) [B] (9.33) [E] (8.62)
Q12 [C] (11.69) [B] (8.62) [E] (7.89)


Q30 [C] (9.12) [B] (2.06) [E] (1.38)
Q31 [C] (11.69) [B] (9.12) [E] (8.45)
Q32 [C] (11.69) [B] (8.45) [E] (7.75)

I have not used the AGC circuit as given in the original V5 but opted
for the LM324 version. However, this is not enabled.

I have taken the Panadapter out from just before the ladder filter
(post the stage 2 TIA). This is connected to SDRSharp to check signals

For the software, I used the V1.2 with frequencies calculated based on KD8CEC:
http://www.hamskey.com/2019/02/whats-new-with-ubitx-v5-1-changed-if.html

I used the following values:
#define SECOND_OSC_USB (56054200l)
#define SECOND_OSC_LSB (33940800l)

#define INIT_USB_FREQ (11059250l)

According to the notes in KD8CEC's blog the firstIF has been set to
45005000L due to L7 and L5 pulling the crystal filter by 5KHz

Using the PanAdapter tap point that has been provided for I can see
that the signal passes through at just about 45.000.000 MHz, but at
times (start up) the signal can be heard on SDR# on 44.993.400.


Going backwards, I have used a signal injector from the input of the
audio amp to the output of the crystal stage and have a good noise
injection level at the speaker. If I use the signal injector at the
input side of crystal filter there is no sound.

I am using a local MW station on 1458KHz as this is the only station
that I can hear via SDR# (AM). The beat seems correct.

I can hear this station on the uBITx speaker very faintly (if I put my
ear next to it).

I am unable to copy any Ham stations or WWV or any other HF broadcast stations.

On start up I can hear a slight crackling noise through the speaker,
but have no clue where this is being generated.

To ensure that the SI5351 was calibrated correctly I used :
https://groups.io/g/BITX20/wiki/Si5351-Calibration-Sketch

and saved the value in the program

I have a RF milivoltmeter (homebrew) using a AD8307 and LM358
(uncalibrated), this is showing signal levels at testpoints. I haven't
done a thorough test at all points yet.

I have injected a 20mV(approx) using a AD9851 into the antenna input I
can hear the zero beat (14.150). With a stronger signal injection the
speaker jumps around quite a bit :-)

I have the following few questions ( few)
1. How do I know that the uBITx is tuned correctly
2. The volume level through the speaker is very poor.
3. Are the voltage levels on the transistors correct?
4. Shouldn't the Pandadapter (RTL dongle + SDR#) show the spectrum of
a larger bandwidth rather than just the tuned frequency at 45MHz?
5. Are the stages amplifying correctly?
6. How do I locate the source of the crackling? This dies down in a few mins.

I have access to a DSO, what checks can I do to verify the working and
improve the sound level?

Thoughts suggestions and comments welcome.

Sorry once again for the long post and thanks for reading. Have a great weekend.

Best 73,

Ravi/M0RVI










--
I'm here to add more value to the world than I'm using up.

Re: Nextion display cutout and mounting. #ubitx #ubitx-help

Ian Reeve
 

Hi Eric,

 

Do you still have the original 2 line display?  If so carefully plug that in to the header pins to see if that responds to the rig controls.

 

Are you using KD8CEC software on the Arduino or is it still the original ubitx?

 

If the 2 line display responds to the rig commands, the Arduino must be working properly and as long as the connections are correct to the Nextion and you are using KD8CEC software on the Arduino I can only suggest the display is faulty.

 

Seems strange though that you successfully loaded the image onto the Nextion, I would have thought a faulty screen would have not loaded the image

 

Regards

 

Ian

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Eric Carter <e.o.carter1@...>
Sent: Saturday, June 8, 2019 3:16:54 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Nextion display cutout and mounting. #ubitx #ubitx-help
 
Hi Ian,

I checked the resistance and continuity of the connections with a multimeter and found no issue. Bummer. I wish it could have been that simple. I am beginning to wonder if there is a problem with the Nextion display itself.

Regards,

Eric