Wa
On Tue, Mar 13, 2018, 4:58 PM Walter <
W9KJO@...> wrote:
On Mon, Mar 12, 2018 at 05:47 pm, Joe wrote:
Walter,
It seems like a big task but it is manageable.
1. Software - you do need to compile it and upload to the atmega micro controller.
There are several tutorials available.
It sounds more difficult than it actually is.
2. Hardware -? On there is a listing of the hardware required and where to source it.? I think if you search for ve1bwv it will pop up.
3. I think. I need to do a build video on youtube. I have several, but they are for operations an features.
4.? The hash filters are used by many. Vk3eye has a video on using them.
Basically, a I use a 1000mfd to 2200mfd cap on input and output. On the output, I add a 2 to 10 ohm resistor in series with the positive lead ouput lead.
Resistor Wattage depends on load but mostly a few watts are fine. It is amazing how effectively the kill noise.
Joe
VE1BWV
?
There are various ways to make the project.
?
I have chosen to mount the display directly on the Atmega .?
?
Since it is a TFT Touch control, external buttons are optional... just a vol control is required?
?
The 2.8 inch TFT Elegoo display? I use plugs directly into the Atmega. I use display? ?from amazon- very high quality and sensitive touch control.? ?Other displays work as well?
?
Plugging the display directly into? the Atmega eliminates any wiring for the display to the Atmega connectivity.? It also helps keep noise down.
?
From the Atmega you need to connect wires to the Digital Connector on the Ubitx board.
From the Atmega you also need to connect the sda and scl pins of the atmega to the sda and scl pins on the DDS si5351(I use the adafruit)
?
From the DDS si5351 you need to connect the 3 output clocks to the digital connector on the Ubitx mainboard.? I use shielded wire
?
On the atmega on the rear side I added some socks so i can acess the pins i require for control.
Since the display is mounted to the atmega directly, I cant access the front atmega contol pins. Adding the socks on the back is easy and solves that problem.
?
?
?
Not Required but its what I do to ensure there is no digital noise and vfo clicks etc.
I use a small Chinese buck voltage regulator with a hash filter on the output --- 12 volt( INPUT or whatever your main input voltage is) in adjusted to 5.01v OUTPUT for the DDS.
This ensures? isolation and kills digital noise?
?
I use? another identical regulator and feed the input with the same 12 volts and adjust the output for 9.5v this goes to the atmega voltage in connector.? This isolates, and keeps the atmega running cool. As well the hash filters kills the noise.
?
As for how much space from the back of my front panel... 1 inch plus the rear sockets i added, probably around 1.5 inches total
?
Attached is a picture of the wiring diagram -?
?
The setup is quite simple.?
?
Joe?
Joe,
I like what you have done with this full color touch screen.? Really nice work.? However, I will not be able to implement your project because you are talking over my head.
I am an electronics technician but I am far from an EE.? I would need much more detailed instructions and parts lists.? I would also need step by step instructions for loading software.? For instance you mention a resistor to reduce hash.? Where does the resistor fit into the system?
So I will say, very nice full color display.? Great Work.? Thanks for showing it to us and sharing some of your information with us.
?
--
73, W9KJO
Walter
