Date   

Re: Let the upgrades begin! #ubitxv6

Justin Bowser - KI5GKD
 

I took the radio apart and painted everything except front and back panels and mounted a speaker in the top.  I won't repaint the front or rear panels until all of the modding is done and there are no more holes to make.  We are going up to our off-grid cabin in Oklahoma next week so I may take this up with me and see how it does hooked up to a MFJ portable dipole.  Our cabin is on top of a little mountain so hopefully it will work good.

Here's where it is at the moment.  I am glad I finally got around to getting one of these as it has been rather fun getting it to where I want it to be.


Re: Dead Or Just Sick?

Jerry Gaffke
 

Jim,

>  The Nano reads 3.3v when the Nano is connected to the PC by itself.
>  The Nano reads about half a volt on the same pin when plugged into the Raduino  

I assume you are putting a DVM between the 3.3v pin of the Nano and ground
when you make those measurements.

If so, something on the Raduino board is shorting the 3.3v rail to ground, as Evan says.
We have had trouble with shorted bypass caps in the past, Evan's suggestion to remove
them one by one till the short is gone is good advice.

The CH340 chip for the USB link on the Nano is powered from 5v,
the core logic of the CH340 chip is powered by a 3.3v regulator inside that chip.
The CH340 chip makes that 3.3v rail available to the Raduino board on the 3.3v pin
of the Nano, the Raduino uses it to power the Si5351 chip, pullup resistors on two
signal traces from Nano to Si5351, and bypass caps.

The Si5351 would be really tough to replace without the right tools,
I'd recommend that you make sure it is responsible for the short before removing it
You can do this by cutting traces as described in this old thread, where John found
that the problem was a bypass cap shorting the 3.3v rail to ground.
John's Raduino had a bad enough short on his 3.3v rail that it destroyed the CH340 chip
on the Nano, your short doesn't seem to be quite bad enough to blow the chip.
Oh John's board, it turned out to be a bad bypass cap.

I would remove the Nano and display from the Raduino, use an ohmmeter to measure 
the resistance from the 3.3v Nano socket pin to ground,  no power to the board.
Hack at that Raduino board until it shows 1k ohms or more (mine is over a megaohm).
It is possible is destroy your Nano's CH340 chip if you continue to 
try powering the Raduino up with the Nano plugged in, as John found out.

###################
From post   https://groups.io/g/BITX20/message/86097


John,

I would avoid removing the Si5351 until I was sure it was the problem.
Short could be somewhere else, even if you don't see it.

With power off, measure from the 3.3v rail to ground on your Raduino with an ohmmeter,
you will probably see close to zero ohms.  You have fixed the problem when you
can get that reading to be much higher.

See if you can fix the short by washing the board with alcohol, especially around the Si5351.
Could be a thin whisker of solder too small to see clearly causing the short.

Before removing the Si5351, I would cut up the 3.3v trace until I was sure I knew
where the short was. 
First, cut the 3.3v trace from C1 to pin 1 of the Si5351, make the cut near the cap.

Use your ohmmeter to see if the short is on the Si5351 side of the cut or the capacitor side.
You can repair the cuts by scraping the green soldermask off the trace where you made the cut,
then patch it with a blob of solder.

I don't see a trace to pin 7,  that is probably connected to pin 1 by a trace under the Si5351.
I assume that trace also goes up to C2, R13, and R14, (the trace is under the "R14" in white),
you may want to cut that trace too,  right where it joins the big fat trace..

If you don't want to deal with swapping out the Si5351, you might try patching in
an Si5351 breakout board:       https://www.adafruit.com/product/2045

Any Nano that's been powered up on this Raduino probably has a blown CH340 chip.
Good thing Nano's are cheap.

At worst, you can buy a whole new Raduino board.
I doubt the main uBitx board has been damaged by this mishap.

If the Si5351 did fail, that would be very strange.
Not sure why that would happen.

Jerry, KE7ER
###################




On Mon, Mar 8, 2021 at 05:29 PM, Evan Hand wrote:
On Mon, Mar 8, 2021 at 02:49 PM, secondchancesailor wrote:
(1) The Nano will connect to the PC by itself, and functions as it should.
(2) The Nano will not connect to the PC when in the Raduino (this is with the Raduino pulled from board, and display disconnected).
(3) The Nano reads 3.3v when the Nano is connected to the PC by itself.
(4) The Nano reads about half a volt on the same pin when plugged into the Raduino  (The Raduino is still pulled from board, and still disconnected from display).
(5) A visual inspection (with hood magnifier) found no indications of a cracked or damaged component.  

Any suggestions as to what to check next?
Jim,

Other than the Si5351a chip, there are only support passive components associated with that 3.3volt pin (the Nano is a 5volt Nano for I/O and analog conversions).  With that understanding, and a visual inspection of my own board, there are really only two things that could be the issue:
1 - One of the capacitors or one of the resistors has failed.  You could pull them one at a time to see if that clears the short.
2 - The Si5351 has failed and you need to pull and replace it.

There are videos on how to remove a chip like the Si5351a.  You can look for surface mount tutorials on soldering and desoldering.  They use either a low temp solder product like ChipQuick or a hot air rework station.

The other choice is to buy another Raduino board.

I would order another Raduino board from HFSignals.  That would give me a spare to try repairing the faulted one on the side.

Good luck in finding the short/fault.
73
Evan
AC9TU


Re: Dead Or Just Sick?

Evan Hand
 

On Mon, Mar 8, 2021 at 02:49 PM, secondchancesailor wrote:
(1) The Nano will connect to the PC by itself, and functions as it should.
(2) The Nano will not connect to the PC when in the Raduino (this is with the Raduino pulled from board, and display disconnected).
(3) The Nano reads 3.3v when the Nano is connected to the PC by itself.
(4) The Nano reads about half a volt on the same pin when plugged into the Raduino  (The Raduino is still pulled from board, and still disconnected from display).
(5) A visual inspection (with hood magnifier) found no indications of a cracked or damaged component.  

Any suggestions as to what to check next?
Jim,

Other than the Si5351a chip, there are only support passive components associated with that 3.3volt pin (the Nano is a 5volt Nano for I/O and analog conversions).  With that understanding, and a visual inspection of my own board, there are really only two things that could be the issue:
1 - One of the capacitors or one of the resistors has failed.  You could pull them one at a time to see if that clears the short.
2 - The Si5351 has failed and you need to pull and replace it.

There are videos on how to remove a chip like the Si5351a.  You can look for surface mount tutorials on soldering and desoldering.  They use either a low temp solder product like ChipQuick or a hot air rework station.

The other choice is to buy another Raduino board.

I would order another Raduino board from HFSignals.  That would give me a spare to try repairing the faulted one on the side.

Good luck in finding the short/fault.
73
Evan
AC9TU


Re: Dead Or Just Sick?

secondchancesailor
 

That's an interesting idea, Reed -Thanks.   I don't have enough on hand, but needed to order some more anyway.


Re: Dead Or Just Sick?

Reed N
 

If you have enough 0.1" jumpers, you might try connecting the nano to the computer, then connect the nano to the raduino board one pin at a time (starting with ground!) until it fails. That will hopefully reduce your search space, since all previously tested pins presumably aren't part of the problem.


Reed


Re: Dead Or Just Sick?

secondchancesailor
 

I finally got back in the shack this afternoon, and was able to try some things you suggested.   Here is what I have found so far;

(1) The Nano will connect to the PC by itself, and functions as it should.
(2) The Nano will not connect to the PC when in the Raduino (this is with the Raduino pulled from board, and display disconnected).
(3) The Nano reads 3.3v when the Nano is connected to the PC by itself.
(4) The Nano reads about half a volt on the same pin when plugged into the Raduino  (The Raduino is still pulled from board, and still disconnected from display).
(5) A visual inspection (with hood magnifier) found no indications of a cracked or damaged component.  

Any suggestions as to what to check next?

Thanks and 73,
Jim


Re: si5351a-b-gt Vs si5351a-b-gtr

Zvi Segal
 

Thanks for info 🤠
--
Zvika 
4Z1ZV


Re: si5351a-b-gt Vs si5351a-b-gtr

Gary Anderson
 

Jerry,
Agree. Wasn't arguing with ya. Actually was in the process of just replying (you know, sometimes you get distractions), and I didn't catch that you answered.
.. otherwise I wouldn't have.  Same part. Q.E.D.    
Gary


Re: It Arrived

Justin Bowser - KI5GKD
 

Mi8ke,

Congrats!  I hope you have fun with it.  I am amazed at what can be done with 10 watts.  I have only been on the air with the BITX for a couple of weeks and I really enjoy it, I think I've only had my TS-520SE turned on twice during that time.

I have added the 3.5" Nextion screen which makes it look like a commercial radio although the stock screen is perfectly functional.

Have fun!

73,

Justin B
KI5GKD


Re: si5351a-b-gt Vs si5351a-b-gtr

Jerry Gaffke
 

Bottom line, doesn't matter, all the same chip.


But it is curious:

Mouser says GT gets shipped in a tube,  GTR is a reel, or tape cut from a reel.
They'll sell you either one in single chip quantities.

Datasheet from SiLabs says GT is "coil tape", GTR is "tape and reel".
Not obvious to me what that distinction might be, but Gary could be right and GT is cut tape.
There are occasional errors in SiLabs docs for the Si535, especially AN619.

Pick and place machines can usually take a mix of tubes and reels.

Jerry

On Sun, Mar 7, 2021 at 12:40 PM, Gary Anderson wrote:
No difference in the chip or package. 
suffix GTR just denotes tape and reel... for large quantities used in manufacturing / pick and place you most likely would want inventory on a reel.
GT is just the cut tape.... a small section of the same tape that would be on a reel.  
Gary

On Sun, Mar 7, 2021 at 12:28 PM, Jerry Gaffke wrote:
GTR means comes off a reel, you get them as cut tape.
GT means they come in a tube.


It Arrived

MDixon KC9LOO
 

My uBitx V6 basic arrived a day earlier than estimated and I cobbled it together to check it out. It works great, even the mic works great. I haven't tried to make any contacts yet.
  I need to get a case for it and decide which, if any mods are needed. I know my old eyes would benefit from an upgraded screen, plus I think the Nextion screens make them look
so much better. I noticed it would probably benefit from an AGC on some really strong signals.

  I have a lot to think about, but this is one amazing radio, I am extremely happy. I am sure to have many questions for everyone as this type of radio is all new to me.

   Thanks,  Mike 


Re: si5351a-b-gt Vs si5351a-b-gtr

Gary Anderson
 

No difference in the chip or package. 
suffix GTR just denotes tape and reel... for large quantities used in manufacturing / pick and place you most likely would want inventory on a reel.
GT is just the cut tape.... a small section of the same tape that would be on a reel.  
Gary


Re: si5351a-b-gt Vs si5351a-b-gtr

Jerry Gaffke
 

GTR means comes off a reel, you get them as cut tape.
GT means they come in a tube.

Makes no difference, unless you are buying thousands to put into your automatic pick-and-place machine.

See page 34 of the datasheet for ordering information about other part number differences.
But either of those should work fine on the uBitx.
    https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf

Jerry, KE7ER



On Sun, Mar 7, 2021 at 11:42 AM, Zvi Segal wrote:

What is the difference between these two chips ?  

Which one is preferred ?


si5351a-b-gt Vs si5351a-b-gtr

Zvi Segal
 

What is the difference between these two chips ?  

Which one is preferred ?


--
Zvika 
4Z1ZV


Re: CEC and Direct Frequency Entry #frequency #nextion #ubitxv6

Evan Hand
 

Justin,
Try one of these:

When I test the .hmi program with the Nextion editor they both seem to have the direct frequency working.

Note:  You will need to use the Nextion LTS editor if you want to modify the display.

73
Evan
AC9TU


Re: CEC and Direct Frequency Entry #frequency #nextion #ubitxv6

Justin Bowser - KI5GKD
 

Zvika - Tnx, I found the file ubitx_35B7.tft in the files section and it appears to work fine - at least the direct freq entry works fine.


Re: CEC and Direct Frequency Entry #frequency #nextion #ubitxv6

Zvi Segal
 

Most 3.5" tft files have some bugs or missing functionality.

I am not sure which is the perfect one if any, but try other program.
--
Zvika 
4Z1ZV


uBitx Nextion 4.3 Inch - Enhanced

geomad
 

Added "uBitx Nextion 4.3 Inch - Enhanced" HMI file to files section


Re: CEC and Direct Frequency Entry #frequency #nextion #ubitxv6

Ted
 

Yes, please let us know how that goes in and if it works.


-Ted


Re: Let the upgrades begin! #ubitxv6

Justin Bowser - KI5GKD
 

I have my UBITX mounted in a case, the new tuning knob machines, and the 3.5" Nextion screen up and running (mostly) and have the auto antenna tuner ordered.  Next up is poking holes in the rear panel.  Once that is finished and the tuner integrated I'll tear it down and paint the case and engrave control labels.  This is what it looks like right now...

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