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Re: The "COCORICO UBITX" The French Touch

 

Curt,

Your AGC can be add in option, but on Ubitx site where is no sch¨¦matic.
I think that the?LDR and LED can be replaced with opto transistor like that. it insulates from the ambient light

On the PCB the AGC is based on schematic of Barry
I still have to make some changes on the jacks (one wire? is missing) and a version with basic nanos as on the original Ubitx.
It allows me to pass the time because it is very cold and a little confined
cdt
Re: From where to get the rx/tx control signal to the PA

 

D7 right (TX_RX)? found.

On 1/9/21 4:19 PM, Rafael Diniz wrote:
Hi all,

In order to do the rx/tx switch in a PA, I need a control signal for it.
The most obvious is the PTT one, but as I'll be keying the radio over
CAT, I think it is not a possibility, right?. From where should I get
the rx/tx control signal?

Best regards,
Rafael PU2UIT







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Re: TFT Display Interfacing

 

Loris,

The Nano Every is something that I want to try. It should give me 16k or so of extra program space.

I tried compiling my sketch with the board setup for the Nano Every and only ran into a couple problem areas, which I think can be easily addressed:
  • The use of timers for the heartbeat interrupt and for sidetone generation
  • The PDQ display library. My original sketch used the Adafruit ili9341 library, but I switched to the PDQ library to save space. It wasn't difficult to switch back (especially with the increase program space). I haven't yet looked into the incompatibility with the PDQ library, that may be addressable.
Other than that the rest of my code compiled, so I'm hoping I can make the transition, but I haven't actually tried the code on the Nano Every. I'm planning on not using the 328 emulation and will hard code the new register names using conditional (#ifdef #else #endif) compilation so that the code will still compile for the original Nano.


73,
Mark, N8ME
Re: VARIATIONS IN SWR WHEN CONNECTING LINEAR AMP

 

P.S.
I have read that the DAY-KIT linear amplifiers made in China use a positive PTT (> 5Vcc for the TX state) ... if you set the PTT of these linear amplifiers to GND in TX, the linear remains in RX, but I don't know what combines the whole circuit.
Is PTT the right one to switch from RX to TX?
73 de
--
IW4AJR Loris
Re: TFT Display Interfacing

 

Hi Mark,
I read that you intend to use an ARDUINO NANO EVERY to do the tests, I notice you that: the EVERY despite having a hardware pin to pin compatible with the OLD NANO, the microprocessor used is fundamentally different, some libraries (even some of the direct libraries of ARDUINO.CC) are incompatible with the internal hardware addressing of the micro ATMega4809 mounted on the EVERY board, an example are the timers (widely used in the V6 of the original ?BITX) all direct commands must be rewritten for the version ATMega4809, in these cases , the Arduino IDE does not even work in the ?version of "emulation ATMega328".
Some time ago I checked the possibility of rewriting the NANO-328 software for the new NANO-4809, but I gave up due to too much time and resources taken to rewrite many pieces of software and libraries.
Best wishes for the test board, if you get at least acceptable results, please publish them and let the download free, I would be really interested in future developments.
73 de?
IW4AJR Loris


On Sat, Jan 9, 2021 at 12:55 PM, Mark Erbaugh wrote:
I would like to mock up the uBITX v6 Arduino and display on a breadboard for testing. I will actually be testing an Arduino Nano Every, which is supposedly pin for pin compatible.

I purchased a "HiLetgo ILI9341 2.8" SPI TFT LCD Display Touch Panel 240X320 with PCB 5V/3.3V STM32" from Amazon.? The board looks identical to the board that came with my uBITX, down to the silkscreen text "2.8 TFT SPI 240x320 V1.2"

The board came with no documentation, but the Amazon sale page had this note: "If you are using this LCD with a 5V device such as an Arduino, be aware that it doesn't work if WITHOUT level shifting to 3.3v logic. Please use level shifters from 5V to 3.3V, it will work then."

The Arduino Nano is a 5V device. The board has a solder pad, J1. My understanding is that this enables a 5v to 3.3v regulator, but this only affects the VCC for the ILI9341 controller, not the control lines. Several of the tutorials I found online show voltage dividers on the control lines, but I see none on the Raduino schematic.

So my questions are:
  • If I bridge J1 is it safe to connect the 5v control lines directly?
  • Can I power the display board from the 5v output on the Nano (i.e. does the Nano provide enough current)?
  • Alternatively, if I don't bridge J1, can I power it from the 3.3v output on the Nano?
73,
Mark, N8ME
Re: The "COCORICO UBITX" The French Touch

 

Gerard

Your ubitx may be one of the hottest around the planet. Most here would vote you a French ham license if you don't have it yet. Okay you didn't include my favorite led and photoresistor agc, but you are forgiven, the ubitx does good without it much of the time.

Thanks for posting link to Jonathan's ubitx design work at VT. Maybe he will start work soon at my employer.? He has very nice analysis of the filters, I merely sent him a few technical papers by hams, and he completed the measurement and modeling. Nice to have a well equipped lab and some interested faculty assisting.

Great viewing, I hope others are enjoying your craftsmanship.

merci boucoup 73 wow

Curt wb8yyy
From where to get the rx/tx control signal to the PA

 

Hi all,

In order to do the rx/tx switch in a PA, I need a control signal for it.
The most obvious is the PTT one, but as I'll be keying the radio over
CAT, I think it is not a possibility, right?. From where should I get
the rx/tx control signal?

Best regards,
Rafael PU2UIT

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Re: The "COCORICO UBITX" The French Touch

 

I forgot to mention that I am inspired by this project
see here


it is necessary to give back to Cesar what belongs to Cesar lol

Made with Kicad, but not manufactured, so not tested

cdt
The "COCORICO UBITX" The French Touch

 

Hello,

This is my creation.
I¡¯ve spent a lot of nights on this project.
it¡¯s a bit like an auto show
A prototype that will be built with only one copy.

I let you discover...

Extended 12v and 5v power supply tracks Possibility to power the PA by 12v or external power supply (Handsolder jumper) Separate integrated power supply for the Nextion or via the 12V (Handsolder jumper) Possible addition of a 2nd filter 45mhz (Handsolder jumper) Add resistors and capacitors on the encoder to eliminate clicks Addition of an additional relay for and/or 12v in Tx/Rx Two nanoV3 on the board (Second with with extended connector) Preamplifier for ear phone (Wiht possibility of AGC) (Change LM386 with NJM2037) BF power with TDA2030 Integrated debrayable noise reductor (Jumpers) Debrayable IF AGC (jumpers) Integrated fan r¨¦gulation with thermistance Int¨¦grated SSB filter or possibity to put your SSB filter with additionnal PCB Power 12v near SSB filter if you use varicaps Possibility to use SMA connector or BNC for antenna (Jumper) Possibilit¨¦ to use standart diodes BAT43 or SMD beak head diodes for ring demodulator Hand solder jumpers to modify the PA for alternative 2n2222 (22 ohm > to 11 ohm, etc) Add SWR near antenna piloted with second arduino (KD8CEC soft) Add LM358 for A7 ssignal on second arduino Add connector for SI5351 clocks (Hort wire on clock0, 1, 2) Add debrayable preamplier for microphone Add heatsink on board ....and some handsolder jumpers on capacitors, resistors for better results all this comes from changes seen on the Ubitx site...

cdt

Re: New ubitx v6 - No sound

 

Diego,?

Before you do anything, be sure that you do have an antenna connected as Dave questioned.??

Here is a link to calibrate the Frequency and the BFO as suggested by the lead designer, Ashhar Farhan:


I do not suggest that you change the frequency calibration unless you are sure it is off frequency.? It should be aligned when shipped from the factory.

I would suggest that you check the BFO using the BFO Tuning Aid that is referenced in the video.? You can do the measurement without going into setup and making any changes.? You do need an antenna connected to get the static white noise for the audio spectrum analyzer to work.

Just some suggestions
73
Evan
AC9TU
Re: New ubitx v6 - No sound

 

Diego

Possibly the problem is the bfo needs to he aligned, it may be way off.

The bfo is a fixed frequency oscillator that mixes the IF to audio. If it is adjusted way off, nothing is heard in the audio.

Can someone provide a starting point vfo value to Diego. I wish all ubitx were shipped with a specific bfo value, so that only a small adjustment were needed.

I tuned my bfo by ear until I heard ssb, the I adjusted both usb and lsb until there was no difference in receiving WWV or another AM signal. Others use an audio spectrum analyzer on their PC. see if there is a video on v6 bfo calibration.

Please write more hear on this until your ubitx is receiving. my ubitx is an older model.

Curt wb8yyy
Re: TFT Display Interfacing

 

Mark,

Thank you for confirming.
I decided to keep it as-is because they are cheap and I should have spares available.

73,
Paul.
Re: TFT Display Interfacing

 

I found this link that describes the operation of J1.



Basically, both Ashhar's and Ismo's answers are correct. The link states:
The short-circuit method has the advantages of simple operation, short wiring, and no need for external devices.

The disadvantage is that the module generates a large amount of heat during operation.

Will affect the life of the module.

The external level conversion module method is a normal operation, and the advantage is that the module generates

less heat and runs stably during operation, and the disadvantage is that the operation is slightly complicated.

(An external level shifting module is required) to increase the cost (additional level conversion module is required).

In summary, it is recommended to use the external level shifting module method.
I've ordered some level shifters for my prototype.

73,
Mark, N8ME
Re: TFT Display Interfacing

 

The board I have looks identical to the one in the uBITX v6. The only thing missing is the QC passed sticker.

I see on the uBITX board that J1 has a drop of solder across it.

Thanks, 73,
Mark, N8ME
Re: TFT Display Interfacing

 

The jumper that needs to be bridged is marked 'J1'
I think this bridges the input pin to the output pin of the '662K' device on the underside of the LCD.
The input pin is connected to the Vcc pin.
I think this is bridging 5v Vcc to the 3.3v regulator output turning the LCD into a 5v device compatible with the Arduino.
Not sure if this is intended but it works!

- Paul.
Re: TFT Display Interfacing

 

1. Many of the ILI9341 boards that i got needed a jumper to be installed to get them going.
Do confirm that the board you have is with the SPI interface. Check the ubitx diagram for compatibility.
2. The ubitx boards work off 5v directly.
3. The 3.3v regulator on the Nano is the smd version of LM1117 3.3v linear regulator. It is constrained by heat dissipation on the small PCB. However, on the raduini boards, it powers up the Si5351 that draws 35 ma without a problem. No one has blown it up yet.
- f


On Sat 9 Jan, 2021, 5:44 PM Mark Erbaugh, <mark.election@...> wrote:
Ismo,

Thanks.

uBITX Display Emulation / Screen Capture

 

I would like to include some screen shots of my uBITX v6 display in a presentation. Taking pictures with a camera is tedious and doesn't give the best results. Is there some inexpensive software that will emulate the display? I found mention of Proteus, but it's quite expensive. Does the demo have enough functionality for my needs? I scanned through the documentation for Proteus. Does it allow you to import an Arduino sketch or do you have to use the graphical flow chart editor?

Alternatively, I considered adding a routine to my sketch to dump the ILI9341 screen memory to the serial port, but I can't find a way to read the screen memory. Can that be done?

73,
Mark, N8ME
Re: TFT Display Interfacing

 

Ismo,

Thanks.
Re: TFT Display Interfacing

 

1. No, you need level shifting. This can be a simple resistive divider om the input signals to the tft. Or one of the cheap active level shifter modules.

2. I think you can power the display from the 5V pin om the nano, if it is done by a 1117-5.0 regulator. Some nanos have smaller 5V regulators and might not work.

3. On mostbarduino nanos I recall encointering tge 3V3 pin is very low power and not suitable for powering anything. In many it is generated by the chg340 USB serial interface chio amd it's datasheet explicitly forbids loading the 3V3 output.

There are likely further threads om this found on the Arduino forums via google.

-Ismo, OH2FTG
TFT Display Interfacing

 

I would like to mock up the uBITX v6 Arduino and display on a breadboard for testing. I will actually be testing an Arduino Nano Every, which is supposedly pin for pin compatible.

I purchased a "HiLetgo ILI9341 2.8" SPI TFT LCD Display Touch Panel 240X320 with PCB 5V/3.3V STM32" from Amazon.? The board looks identical to the board that came with my uBITX, down to the silkscreen text "2.8 TFT SPI 240x320 V1.2"

The board came with no documentation, but the Amazon sale page had this note: "If you are using this LCD with a 5V device such as an Arduino, be aware that it doesn't work if WITHOUT level shifting to 3.3v logic. Please use level shifters from 5V to 3.3V, it will work then."

The Arduino Nano is a 5V device. The board has a solder pad, J1. My understanding is that this enables a 5v to 3.3v regulator, but this only affects the VCC for the ILI9341 controller, not the control lines. Several of the tutorials I found online show voltage dividers on the control lines, but I see none on the Raduino schematic.

So my questions are:
  • If I bridge J1 is it safe to connect the 5v control lines directly?
  • Can I power the display board from the 5v output on the Nano (i.e. does the Nano provide enough current)?
  • Alternatively, if I don't bridge J1, can I power it from the 3.3v output on the Nano?
73,
Mark, N8ME
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