Date   

Re: Raduino32. New batch of PCB #ubitxv6 #esp32 #raduino32

W8DU_Arnie
 

Gracias Ramon.
I would like to order a populated board. How do I reserve one?
73 de Arnie W8DU


Re: Ubitx V4 - What is RV4 supposed to do?

RichW6BOT
 

Thanks Skip, Evan and Raj,

I appreciate the time and feedback on this.

The 2N2222A's will be here in a few days.  in the mean time, I'll get some baseline readings with a dummy load.  Then see how well some of the mods help.

Remember the old days when you could go to the local/area electronics store to get parts?  Now those stores nearly gone and everything has to be ordered online, with shipping costs more than the parts.  😥  I guess that's progress!

Rich - W6BOT

 

 


Re: Regarding CW mode on mbitx ver 3

Ishwarrao Sutrave
 

Ok tnq

Ishwarrao K S

On Thu, 18 Nov 2021, 7:27 pm Skip Davis via groups.io, <skipnc9o=yahoo.com@groups.io> wrote:
Ishwarrao, 

The CW keying is voltage dependent so make sure to clean the key contacts good, if not it can cause this problem also.

Skip Davis, NC9O 

On Nov 18, 2021, at 06:25, Ishwarrao Sutrave <ishwarraosutrave@...> wrote:


Hello
Difficulties with the cw mode when doing cw keying suddenly dot signal dissappear 
Why this happens
Anybody have suggestions 

Ishwarrao K S
Vu3mug


Re: Regarding CW mode on mbitx ver 3

Skip Davis
 

Ishwarrao, 

The CW keying is voltage dependent so make sure to clean the key contacts good, if not it can cause this problem also.

Skip Davis, NC9O 

On Nov 18, 2021, at 06:25, Ishwarrao Sutrave <ishwarraosutrave@...> wrote:


Hello
Difficulties with the cw mode when doing cw keying suddenly dot signal dissappear 
Why this happens
Anybody have suggestions 

Ishwarrao K S
Vu3mug


Regarding CW mode on mbitx ver 3

Ishwarrao Sutrave
 

Hello
Difficulties with the cw mode when doing cw keying suddenly dot signal dissappear 
Why this happens
Anybody have suggestions 

Ishwarrao K S
Vu3mug


Re: Raduino32. New batch of PCB #ubitxv6 #esp32 #raduino32

Ted
 

Muthu,

So very sorry to hear of your loss. May you and your family be at peace. 


Ted
K3RTA


Re: Ubitx V4 - What is RV4 supposed to do?

Evan Hand
 

On Tue, Nov 16, 2021 at 08:22 AM, RichW6BOT wrote:
That's what I thought it was.  The previous owner has it turned all the way up and I'm only getting about 4 watts on 40m.
I've ordered the 2N2222a metal cans, so will see how that helps before I go too much further.
Hello Rich,

One caution in using CW to measure the output on 40 meters.  There is a potential mismatch of impedance for 40 meters with the input of Q90 that causes the signal from the mixer to be distorted when operating on 40 meters more so than the other bands.  This causes lower drive on 40 meters that results in lower power.  This does not seem to be the case if you use a constant tone and SSB as the reference signal.

Still, doing the 2n2222a modifications that Allison Parent, KB1GMX,  has documented in the Groups.io messages is still a good upgrade.

73
Evan
AC9TU


Re: Raduino32. New batch of PCB #ubitxv6 #esp32 #raduino32

LAKSH MUTHU
 

On Tue, Nov 16, 2021 at 11:40 AM, <ramonlh@...> wrote:
Hola,

I have prepared a new batch of Raduino32 PCB with some modifications and improvements:
  • Some components have been relocated.
  • Since there are already stocks of the Si5351 chip, it has been incorporated into the board although the socket has been left in case it was necessary.
  • The reverse polarity protection relay has been removed and only the MOS
  •  

HALLO DR.RAMON
         Thanks for your reply and sorry for my belated reply. My father became silent key suddenly and I am QRL in certain ritual rites for a fortnight. I will revert back soon. 73
   MUTHU VU2LMN


Re: Ubitx V4 - What is RV4 supposed to do?

Skip Davis
 

Hi Rich, 
I dug out my notes and the resistors changed in the mic amp were R63 and R65. R65 was changed to 4.7K from 1K and R63 was changed to 10 ohm from 47 ohm.
I replaced Q90 with a SMD 2N2222A and measured an increase in output power on 15 to 10 meter bands with almost twice the power of the stock 2N3904. I set my power supply to 12vdc for all my measurements. I adjusted RV1 for 11 watts on 40 meters at 7.220 MHz.
All other output stages were unmodified at that point. There was also some mods done by Howard Fidel WB2VXW adding some capacitors across the emitter resistors and an 33uh inductor in series with the collector/base resistors of the driver stages.

I also added a simple mod for reducing a thump when unkeying the mic it was most notable when using headphones with the rig. Also I replaced R250 with a small trimmer resistor about 10K to adjust the side tone level, way too loud with headphones.

Skip Davis, NC9O 

On Nov 16, 2021, at 09:23, RichW6BOT <rich.allen.gordon@...> wrote:

That's what I thought it was.  The previous owner has it turned all the way up and I'm only getting about 4 watts on 40m.
I've ordered the 2N2222a metal cans, so will see how that helps before I go too much further.

The modulation seems a bit low too.  I'm using a Yaesu MH-34 mic that I rewired.  May need to look at one of the mods to improve that.

Thanks!

Rich - W6BOT


Re: Adjusting the Smeter on the Raduino32 #esp32 #smeter #raduino32

dulemilic97@...
 

Of course, Ramón.
Appreciate your efforts in developing Raduino32 and looking forward to future versions of it.

Best regards,
Dušan, 4O6LEE 


Re: Raduino32. New batch of PCB #ubitxv6 #esp32 #raduino32

ramonlh@...
 

Hi Arnie,

Thanks for your interest.

Sorry, it doesn't support Nextion display.

The original uBitx v6 TFT screen or other 320x240 TFT screen with ILI9341 driver and SPI interface must be used.

Ramón


Re: Raduino32. New batch of PCB #ubitxv6 #esp32 #raduino32

W8DU_Arnie
 

I am very interested in ordering this. Is this compatible with the Nextion display?
Gracias!
73 de Arnie W8DU


Oops SolderSmoke podcast #234

Bill Meara
 



SolderSmoke Podcast #224

Bill Meara
 


Re: V6 strait key issue

 

Thanks David,
 
I didn't feel offended at all on the contrary, I'm glad you answered so precisely, let's not exaggerate, I'm not a "genius" but just a good electronic, with some years (unfortunately a bit many) of experience both in microprocessors that in communications, as regards the "work in progress" on the µBITX-V6 I have several ...
I am not interested in more or less efficient video interfaces of the Raduino and the Software modification i'm just as little interested (the firmware is another thing, it refers to the " libraries "that govern the hardware) ...
I wrote and made too much Software e Firware that "run" for work in the passed years, so I'm focusing on solutions other than the Software and possible modifications or additional purely hardware implementations ... 
I will definitely write something about it in the future ...
Precisely because I am more interested in hardware than software, I asked my question, it is not rhetoric, it is concrete and real, I have a couple of pairs of MOS RD16HHF1 in the drawer and I would like to replace them at the current pair of IRF510 in the my µBITX-V6 
... but ... 
out of "laziness" I asked if anyone had already tried to make this change to calibrate the bias voltage without making too many measurements on the quality of the RF output ... 
I know very well that it is not enough to lower the output power to have little intermodulation , but out of "laziness" I didn't want to be there to make tests and measurements with two-tone generators and a spectrum analyzer to best calibrate the two power amplifiers ...
Thanks anyway for the answer ... I hope to connect you in the "air" and greet you in person ...
A dear leap, 
-- 
73 de IW4AJR Loris


Re: Adjusting the Smeter on the Raduino32 #esp32 #smeter #raduino32

ramonlh@...
 

Hi Dušan,

It's on my to-do list. On the one hand, my knowledge in this area is limited and, on the other hand, I have doubts about whether to implement it on this board or on an additional board that I am working on that will serve as an audio server.
 
My priorities right now are:
  • Operate the uBitx + Raduino32 control from an Android device or PC. Since the PC is already working, it only remains to eliminate some errors that occur due to the unexpected disconnection of the TCP server.
  • Integrate remote audio client / server.


Saludos,
Ramón EA4GZI


Re: V6.1 Blown output transistors and pcb trace #v6 #ubitxv6-help

Stan K3PW
 

Thanks for the information, Gary and Evan! Guys like you two, Raj, and other make this group a great resource for all of us.

Thanks for the measurements from your radio, Evan.  If nice to know that my measurements are reasonable and so close to yours.

Stan K3PW


Re: V6.1 Blown output transistors and pcb trace #v6 #ubitxv6-help

Evan Hand
 

Hello Stan,

To answer your first question, as received from the factory my v6 uBitx is drawing 730ma for the test when I press the mic PTT button and do not supply any sound to it.  I have not changed the bias, so assuming all was set as per the instructions, then my starting current would be 530ma, just 10ma below what you are measuring.  That is supplying 12.0 volts, not 13+ volts that most amateur power supplies provide.  It may be that the tuneup guide has not been updated for the larger display that draws more current.

To answer your second question, No, what you have done is not reasonable.  You still want to increase the bias to draw 100ma for each of the IRF510s.  That means if you start with the 540ma then the total should be 740ma when the two are adjusted correctly.  The reason is that you want the IRF510s in their linear region, which starts at 100ma (give or take a few).

Above are just ideas and measurements that I did on my uBitx.  Raj was involved in the development of the uBitx so may have more information.
 73
Evan
AC9TU


Re: V6.1 Blown output transistors and pcb trace #v6 #ubitxv6-help

Gary Anderson
 

Stan,
Instructions were written prior to the added current draw of the TFT display.
Yes, set the bias for 100mA increase like Raj and and instructions said.


Re: V6.1 Blown output transistors and pcb trace #v6 #ubitxv6-help

Stan K3PW
 

I’m using the instructions at https://www.hfsignals.com/index.php/ubitx-tuneup/ which is essentially what you have in your post, Raj, except for one detail.  These instructions say with RV2 and RV3 fully clockwise the current should be between 470 and 500ma.  Mine is more than that, my current draw is 540ma, 40ma high.  

I’m not sure if 540ma instead of a max of 500ma is a problem or not.  What I did was bring the total current draw after adjustment to 700ma (500+100+100) by adding 80ma with each resistor making a total increase in current of 160ma.   

Here are my questions - 
1. Does the 540ma current draw indicate a problem I should worry about before adjusting PA bias?
2. Is what I’ve done a reasonable adjustment, staying under 700ma for total current draw, or is it inadequate bias?
3. Would it be better to adjust the two resistors for 100ma increase each for a total current draw of 740ma?

I appreciate all comments and suggestions!

Stan K3PW

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