Re: DAYLIGHT RADIO - PLASTIC TOROID MASTER
For VHF work, do not ignore the lowly brass. They make excellent cores for toroids as well as solenoid inductors.
I have used solid teflon on hf. It gave good result but the best is RF grade Nylon.
On Sat, Aug 20, 2022, 9:03 AM Mark - N7EKU < n7eku@...> wrote: The test would be to measure the Q of a solid 3d printed toroid vs a hollow form one,
I couldn't find any posts about that, are there some here?? G3YNH talks a lot about materials, but mostly relating to capacitors where it makes a big difference.? For formers he just quotes two amateurs who did some experiments on dowels vs PVC antenna loading coils.? I'm not sure I would discount anything at this point without doing serious measurements.? And remember, in measuring coil Q everything needs to be controlled, such as coil placement from nearby surfaces and objects for example.
Micrometals uses phenolic material for their VHF toroid cores yet according to the chart it is a poor choice.? I hardly think they would choose something that give poor coil Q when they could have chosen PS for example.
Another good test would be to purchase some phenolic cores (material 0) and then copy it on a 3D printer and make Q measurements.
73
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Re: DAYLIGHT RADIO - PLASTIC TOROID MASTER
I have used solid teflon on hf. It gave good result but the best is RF grade Nylon.
On Sat, Aug 20, 2022, 9:03 AM Mark - N7EKU < n7eku@...> wrote: The test would be to measure the Q of a solid 3d printed toroid vs a hollow form one,
I couldn't find any posts about that, are there some here?? G3YNH talks a lot about materials, but mostly relating to capacitors where it makes a big difference.? For formers he just quotes two amateurs who did some experiments on dowels vs PVC antenna loading coils.? I'm not sure I would discount anything at this point without doing serious measurements.? And remember, in measuring coil Q everything needs to be controlled, such as coil placement from nearby surfaces and objects for example.
Micrometals uses phenolic material for their VHF toroid cores yet according to the chart it is a poor choice.? I hardly think they would choose something that give poor coil Q when they could have chosen PS for example.
Another good test would be to purchase some phenolic cores (material 0) and then copy it on a 3D printer and make Q measurements.
73
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Re: DAYLIGHT RADIO - PLASTIC TOROID MASTER
The test would be to measure the Q of a solid 3d printed toroid vs a hollow form one,
I couldn't find any posts about that, are there some here?? G3YNH talks a lot about materials, but mostly relating to capacitors where it makes a big difference.? For formers he just quotes two amateurs who did some experiments on dowels vs PVC antenna loading coils.? I'm not sure I would discount anything at this point without doing serious measurements.? And remember, in measuring coil Q everything needs to be controlled, such as coil placement from nearby surfaces and objects for example.
Micrometals uses phenolic material for their VHF toroid cores yet according to the chart it is a poor choice.? I hardly think they would choose something that give poor coil Q when they could have chosen PS for example.
Another good test would be to purchase some phenolic cores (material 0) and then copy it on a 3D printer and make Q measurements.
73
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Re: Farhan's Analog Again The Daylight Radio
I am updating the stl files. I will link them up on the blog page of the Daylight radio. - f
Where can the .STL files for the 3d printed plastic toroids be found?
The PTO VFO one I have found easily. But the toroids are proving more elusive.?
Or is that left as an exercise to the homebrewer??
I have the audio chain built and starting on the product detector and BFO, so I'll soon get closer to the VHF, TX filters and the RX band pass filter and the toroids become more relevant.?
-Ismo OH2FTG
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Re: DAYLIGHT RADIO - PLASTIC TOROID MASTER
Never mind, sorry, I just re-read Ashhar¡¯s post:
¡°Ashhar Farhan Aug 15
. . . The inside of the toroid should be hollow and it not hollow it should have as little in-fill as possible. This is the key to high performance 3D printed toroids . . . ¡°
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Re: DAYLIGHT RADIO - PLASTIC TOROID MASTER
Here is one of the 25mmToroid.stl files printed in PLA at 5% infill, then cut open with a small angle grinder. It looks like more internal open space is needed. Has anyone figured out layer thickness, infill proportion, etc. similar to Ashhar¡¯s toroids?
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KD8CEC Standalone Source vs Hex missmatch on Pin definitions?
Been staring at the source for Ian Lee's standalone S-meter and SWR. See? In uart_forward.cpp, at line 75 and 78 we have the definition of PINs for passthru of the Nextion protocol from the main processor:
#define TX_PIN 9
#define RX_PIN 8
However, if you look at his explanation at:?
In the illustration, he is clearly using RX pin (D!) for read from the main nano..Output is D9 as specified above.? The pre-compiled Hex files use RX/D1 and D9 so the diagram is correct.
Is this just a difference in the final selection of which pins to use and the source is just out of synch with the pre-generated HEX files? Or is there something more subtle that I am just missing. (I had thought that using RX on a nano was problematical because it is hardwired to the USB connection).
Thanks for any enlightenment you can share.?
73
Mark
AJ6CU
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Aaron,
That is a basic screen.? Is there an R or N after the number?? If an N, then it is not a touch screen.
You can test the file load using the supplied power adapter without connecting the serial communication lines.? It should come up to the power on screen.? Do this before you install the screen.
I have found that some microSD cards will not work, even after formatting.? Sometimes the SD Association formatter will resurrect a card.? Other times I had to get a new microSD card to get it to load.
You do need a touch screen model for the files to load.
73
Evan
AC9TU
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Evan,
Can you share the HMI files? Trying to collect all the Nextion screens in one place. See
I am not sure I have your designs?
73
Mark
AJ6CU
PS: Aaron - The 3.5" is often mounted upside down so that the sdcard is up. Not sure if the screens that Evan shared were flipped, but that has to be done in the Nextion editor and a different ttf file created. I respect Evan's choice on screens, but if you need a flipped ones another design is here:?
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Thnks Evan, I'm pretty sure that I have the basic one. Here is the number NX4832T035_011 -- '72
Aaron K5ATG
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Hi Aaron,
Thank you for the compliment.
The correct file to use with the Nextion microSD card de[ends on the model of the Nextion display.? I would look up the model number on the Nextion site to see which model it is:
Most of the files provided are for either the Basic or Enhanced models.? There have been posts on using the .hmi files and the newest Nextion editor to work with the other models.
The correct is the one that matches the model that you have.? The file that you listed is for a basic 3.5" model.? If you have an Enhanced model, it would be UBITX_35_E.tft.
If the above does not help, please post the model number that you have and I will look up the correct 3.5" file to use.
If you have a basic or enhanced version, I prefer this Nextion screen layout:
73
Evan
AC9TU
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Re: Farhan's Analog Again The Daylight Radio
Where can the .STL files for the 3d printed plastic toroids be found? The PTO VFO one I have found easily. But the toroids are proving more elusive.?
Or is that left as an exercise to the homebrewer??
I have the audio chain built and starting on the product detector and BFO, so I'll soon get closer to the VHF, TX filters and the RX band pass filter and the toroids become more relevant.?
-Ismo OH2FTG
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Re: sbitx software bug-or-feature
#sBitx
The IF would be another one that would benefit?greatly from a per band stored setting.
If you make some changes John would you mind sharing them on here, I want to "fix" that issue with the IF but haven't had time to do so yet, might try to sit down with it tomorrow evening.
I found the /home/pi/sbitx/data/user_settings.ini file that lists the starting values.
Now to find the code that should keep these values current Band/Mode session to session.
John?
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Re: Daylight radio toroids
Ah,
I expect folks were discussing ferrite toroids used in power applications (antenna and PA transformers) where designs have to be well done or else there can be high losses and/or damage to the cores.
As long as one doesn't need large inductance which then requires many turns, they are great (and the core can be free if you make it yourself).? Your example is what a good one would look like for sure.
73
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Re: sbitx software bug-or-feature
#sBitx
I found the /home/pi/sbitx/data/user_settings.ini file that lists the starting values.
Now to find the code that should keep these values current Band/Mode session to session.
John?
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Re: Github repository for KD8CEC Nextion screens
Mark
Thank you very much for this great informations and for the files. These are very helpful.
?
Thanks again.
vy 73 de Salvi - HB9GBY
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Where do I find the bias adjustment procedure?
Art
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On Aug 19, 2022, at 15:09, Ashhar Farhan <farhanbox@...> wrote:
? Once the regulator is in place, you won't blow the PA finals unless you run them on high swr for a long time. Stupid question, when I replace my finals, can I use a socket since it seems that we may br replacing these on a regualr basis?? Any gotchas in doing so?
Hi Jerry,
I installed the buck regulator board, replaced the finals and went through the DRIVE and PA bias adjustments.? I am back on the air!?
Heat sink is much cooler to the touch and no noticeable increase is audible noise.
Thanks for your help, Scott
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Ok please forgive me folks. I am at a point where I am having 1-2 surgeries every week for the next month. This handicaps me farther from all of the drugs that they are giving me.? I am trying to install a Nextion 3.5" display on my uBITX v6. For the Raduino, I loaded up the file that is named: UBITXV5_CEC_V1.200_NX and it is in HEX File format. I got the file from the link that Evan AC9TU shared with me on message #93965. (Evan has made it a habit of saving my skin from my uBITX misadventures. Thank you Evan) I used the XLoader software and there did not seem to be any trouble loading it up.? My troubles are with the Nextion Display. I format a micro SD card to FAT32. Then I load the file? ubitx_35.tft?on the SD card. I then wire up the 3.5" Nextion display to the TFT Display Header on the Raduino. Here is how I wire it up.? RED Wire- +5V?to pin #1 on the TFT Header (I am asuming that the pin numbers on the TFT Display starts at the top and goes down then the Raduino is plugged into the uBITX board)
BLACK Wire - Ground?to Pin #2
YELLOW Wire - RX???to Pin # 5
Blue Wire - TX?to Pin #11
When I power everything up the Raduino shows that it is powered up, I can see this because of the red LED light on the raduino lights up. However the Nextion does not light up at all. I have tried this with both a 2.8" Nextion and a 3.5" with the same results on both.? If I plug the Nextion Display up to a 5V source (when I do this I am not using the yellow or blue wires) The Nextion display lights up with a white screen that says: SIZE: 1967505 COPY SD: 0% And that is it, it never goes above 0% If I were to load Reeds Arduino Sketch to the Raduino and put the stock TFT display back on everything works. So I believe that I am doing something wrong with loading the firmware to the Nextion and hooking the Nextion up to the Raduino. I'm stuck here and I'm not sure what my next step should be.? -- '72
Aaron K5ATG
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Re: #sbitx - an ugprade kit is on the way
#sBitx
Don, The shipping is itself working out to be 15 dollars from India (we haven't started stocking in the? usa yet). So, we have put all the upgrade kits into one box and sent it to USA. They should arrive in the next few days. From there they will be posted locally. I would expect them to get delivered by end of next week.
On Mon, Aug 15, 2022 at 12:01 AM, Ashhar Farhan wrote:
?
These will go out by Thursday if all is well.
?
?
- f
Will there be any notification they've shipped, and by what method? Not wanting to create any additional work for the HF Signals team, just nice to be able to keep an eye out for the delivery, especially as erratic as my usps delivery can be.
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Once the regulator is in place, you won't blow the PA finals unless you run them on high swr for a long time.
Stupid question, when I replace my finals, can I use a socket since it seems that we may br replacing these on a regualr basis?? Any gotchas in doing so?
Hi Jerry,
I installed the buck regulator board, replaced the finals and went through the DRIVE and PA bias adjustments.? I am back on the air!?
Heat sink is much cooler to the touch and no noticeable increase is audible noise.
Thanks for your help, Scott
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Craig Wadsworth
Aaron K5ATG
Ismo V??n?nen OH2FTG