Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Hi Dave,
I built one if these ?13 MiniPAs. After playing around with drive and bias, frying a set of mosfets, adding a keying circuit, LPF, heatsink, fan and adding a third resistor, it works reliably, putting out just over 50w.
I'm certainly NO expert constructor, but I learnt stuff in the exercise, and gained considerable satisfaction in the final operation. Recommended.
Best,
N
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The following files have been uploaded to
the Files area of the [email protected] group.
By: vu3gao@...
Description:
N8ME's firmware for uBitV6 with VU3GAO mods to address CW keying issue, Filter switching at 7Mhz, VFO Display Overlap with RF Shift/Tuning, Improved Layout with Heart Beat Indicator.
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Re: Increase uBitx to 25 watts i
Dear Balls,No attachment about modification found.? Please send attachment again.
Tnx n 73 de VU2SMM..Rajendran
Dear WYC,?
Hope the attached MODIFICATION can? be done now for increasing RF POWER to? 25w.? I will ARRANGE Seperate HIGH V A DC.?
Best of 73s.??
? ??
On Mon, Oct 25, 2021, 3:35 PM Jonas Sanamon < sanamon@...> wrote: Hi Dave,
The cheapest and easiest way to achieve ~20w output is to supply a higher voltage to just the PA part of the uBitx.? For version 3-5 at least there is a separate input pin on the PCB for supplying a different voltage to the PA. I don't have a v6 so cannot tell if that has a similar design, but even if it doesn't it should be easy to look at the schematic and find a suitable place for cutting a track and supplying a separate PA voltage.? I have a Li-ion battery pack for portable use, it is around 18-20v and with this I get around 20-25w output on the lower bands which is what I use. I have added an internal 7812 12v regulator to feed the 12v input with 12v from same battery, this needs to be mounted on metal in order to have cooling, and i have done the same with the 7805 5v regulator on the radiuno?which I found to get a bit hotter than what I find comfortable. One could use DC-DC converters instead, but there is a high risk of interference from them so beware.
Do NOT supply 20v to the entire uBitx as that will let the magic smoke out.
Even without modifying to have a single power input, having 2 battery packs for separate voltages should be cheaper than an external PA....
Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.??
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
One good way to increase power of ubitx without fiddling with ubitx is to use an external attenuator and an cost effective linear amp WA2EBY d sign which gives 40 watts . We are about to begin sales very?soon for? WA2EBY HF Amp with ready made low pass filter and an affordable attenuator. All our products showing on our website may lead to our eBay store, reason being eBay offers a cheaper shipping with ebay global shipping. DHL e-commerce is closing in November as they are in a loss . DHL express is becoming too expensive. So economic shipping options are becoming increasing hard to find We are still trying to see if we can find an alternative shipping company for our products sold on .
Our website for dx hams?
Our website for indian hams?
Best regards Sunil vu3sua
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Re: Free RTOS N8ME_2 software
Mark,
Im using your software on my ubitx v6.1. All i can say is its flawless for me. love the tuning rates that can be changed and the display refresh rate after switching to something else. In my book you should write a book on how to write code for the arduino
?
73
David
ac9xh
?
good thru hamcall,qrzcq.com.FCC website.Im not listed on qrz.com
---------- Original Message ---------- From: "Mark Erbaugh" <mark.election@...> To: [email protected]Subject: Re: [BITX20] Free RTOS N8ME_2 software Date: Mon, 25 Oct 2021 21:59:23 -0400
Joerg,
?
Thanks for the complement. That sketch was an exercise in programming the Arduino. One of the things I concentrated on was screen updating.
?
73,
Mark
On Oct 25, 2021, at 5:24 PM, Joerg DB2OO < db2oo.ju@...> wrote:
Mark,
I recently bought an unfinished uBitx V6 with a 5" Nextion display through eBay. Unfortunately the display did not work (serial interface not working) and I had to flash the OOTB software and use the 2.8" display. With that I considered the uBitx as essentially unusable, due to the very slow display updates.
Then I found your software, flashed it and found a completely new uBitx! Fantastic work, no reason any longer, to buy a Nextion display.?
CAT interface is also working great with the WSJT-X software and the memory functionality as well as the configuration functions in the menu are really helpful. No need for me to look for another display or a faster processor.
Many thanks, providing this to the group.?
73, Joerg - DB2OO
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Re: Free RTOS N8ME_2 software
Joerg,
Thanks for the complement. That sketch was an exercise in programming the Arduino. One of the things I concentrated on was screen updating.
73,
toggle quoted message
Show quoted text
On Oct 25, 2021, at 5:24 PM, Joerg DB2OO < db2oo.ju@...> wrote:
Mark,
I recently bought an unfinished uBitx V6 with a 5" Nextion display through eBay. Unfortunately the display did not work (serial interface not working) and I had to flash the OOTB software and use the 2.8" display. With that I considered the uBitx as essentially unusable, due to the very slow display updates.
Then I found your software, flashed it and found a completely new uBitx! Fantastic work, no reason any longer, to buy a Nextion display.?
CAT interface is also working great with the WSJT-X software and the memory functionality as well as the configuration functions in the menu are really helpful. No need for me to look for another display or a faster processor.
Many thanks, providing this to the group.?
73, Joerg - DB2OO
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Re: Free RTOS N8ME_2 software
Mark,
I recently bought an unfinished uBitx V6 with a 5" Nextion display through eBay. Unfortunately the display did not work (serial interface not working) and I had to flash the OOTB software and use the 2.8" display. With that I considered the uBitx as essentially unusable, due to the very slow display updates.
Then I found your software, flashed it and found a completely new uBitx! Fantastic work, no reason any longer, to buy a Nextion display.?
CAT interface is also working great with the WSJT-X software and the memory functionality as well as the configuration functions in the menu are really helpful. No need for me to look for another display or a faster processor.
Many thanks, providing this to the group.?
73, Joerg - DB2OO
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BTW: Try the N8ME_2 software from the files section with the ILI9341 display and you will see, that there will be no need any longer to increase display speed through a Nextion display.?
I have been greatly impressed by the improvements vs.? the OOTB software. It makes the uBitx a completely different transceiver.?
Many thanks to N8ME!!
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On Sat, Sep 18, 2021 at 02:50 PM, KC2UKU ED wrote:
I have a V6 kit NOT the full kit I'm build some bigger here one thing I doing I moving the keyer and headphone to the back using so239 and XT60 panel mount for power over kill...
Now I have been looking at Nextion 3.5 display $40.00+ damn the are expensive what I like to can I just replace the 2.8 TFT display with?3.5 Inch 480x320 SPI Serial TFT LCD Module Display Screen with Press Panel for about $23.00 here check it out that know more then I do about this:::????
If some out there in ubitx world that have a 4.3 or 5 inch nextion display that works with bitx v-6 used there would like to sell let me if not to bad $$$ I may just get it ...
ED W2ELM
Hello Ed, the " 3.5 Inch 480x320 SPI Serial TFT LCD Module Display Screen with Press Panel" users a different controller ( ILI9488) than the 2.8" display delivered with the uBitx (ILI9341). This will require most probably in-depth code changes, as the "pdq_gfx_libs" used in the fast versions of the uBitx does not support this controller.?
You would have
1.? ?to find a similarly fast library for the Arduino supporting ILI9488
2. change the UI code, to adapt to the higher resolution.?
3. from another project with an ESP32 I also learned, that the ILI9488 is much slower than the ILI9341.?
I could find ILI9341 displays up to 3.2", which would not require any code changes. The 0.3" will not justify this effort.?
73, Joerg
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Dave,
I have built one and bought one assembled of this 100watt multiband LPF:
Works well for 3rd harmonic suppression, just OK for a second harmonic.? That means use it for a push-pull output amp like the 70 watt DIY amp, not a single transistor amp.? (My interpretation, if fed a clean signal a single transistor amp should be fine).
73
Evan
AC9TU
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
On Sun, Oct 24, 2021 at 08:46 PM, Dave Space wrote:
Thanks I will take a look.? Is that a 12volt kit I've seen those listed but I don't think they listed the input voltage or I've seen some listing 24v input.
Is there a good low pass filter you would recommend for that for 40 meter?
It is using a 12v supply. If you just want a low pass filter for 40m then have a look on the G-QRP clubs website. Look in the technical section and you will find a data sheet for making LPF for different bands. There is also a separate data sheet giving info. on using different toroids and the number of turns required for a given inductance value. I used silver mica capacitors but you can use other types. The filters I built from those two data sheets (40, 30 and 20m so far) all came out well and had more than 60dB attenuation on second harmonics. I see someone has posted a link to the website that has quite a bit of info. on these amp kits. One caveat... if you do get a kit and the IRF510's have the info. ground off them then replace with known good components. I have one kit with good IRF510's and another kit where they have had the info ground off, fortunately I have spares from a known, good source. By the time you have finished it would be cheaper and easier to get a 50w amp from QRP-Labs, I have these but fancied having a play with the 70w kits. Reg????????????????? G4NFR
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Re: Increase uBitx to 25 watts i
Dear WYC,?
Hope the attached MODIFICATION can? be done now for increasing RF POWER to? 25w.? I will ARRANGE Seperate HIGH V A DC.?
Best of 73s.??
? ??
On Mon, Oct 25, 2021, 3:35 PM Jonas Sanamon < sanamon@...> wrote: Hi Dave,
The cheapest and easiest way to achieve ~20w output is to supply a higher voltage to just the PA part of the uBitx.? For version 3-5 at least there is a separate input pin on the PCB for supplying a different voltage to the PA. I don't have a v6 so cannot tell if that has a similar design, but even if it doesn't it should be easy to look at the schematic and find a suitable place for cutting a track and supplying a separate PA voltage.? I have a Li-ion battery pack for portable use, it is around 18-20v and with this I get around 20-25w output on the lower bands which is what I use. I have added an internal 7812 12v regulator to feed the 12v input with 12v from same battery, this needs to be mounted on metal in order to have cooling, and i have done the same with the 7805 5v regulator on the radiuno?which I found to get a bit hotter than what I find comfortable. One could use DC-DC converters instead, but there is a high risk of interference from them so beware.
Do NOT supply 20v to the entire uBitx as that will let the magic smoke out.
Even without modifying to have a single power input, having 2 battery packs for separate voltages should be cheaper than an external PA....
Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.??
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Dave,
Here is a link to the author's implementation of a DIY Kit that produces 50 watts with a 13.8volt power supply and 5 watts input:
You could try to modify the uBitx PA section to match this (as far as I can tell the DIY kit uses IRF520 MOSFETs).? The issue would be that the driver does not put out 5watts, so an intermediate drive would need to be added.? This was verified in a number of trials by others more skilled in RF design than am I.? If you just add the DIY amp after the uBitx amp, then you will need to reduce the output of the uBitx power amp to less than 5 watts.? This can be done with RV1.? You could do surgery on the board to use the built-in LPF, though I would add a second LPF assembly that is rated for greater than 50watts.? There are DIY kits on eBay for those filters.
As to separating the v6 PA supply from the rest of the radio, the 3 pin power connector is still provided, but you will need to cut a trace on the board to separate the supplies.? I HAVE NOT DONE THIS, so please verify for yourself!!? Tracing the runs on the PC board point to the jumper trace between the two power pins on P1 being on the top side of the board under the connector.? You would need to remove the connector, cut the trace, and then solder the connector back on the board.? Again, this is visual only, I have not removed the connector to verify.
Hope this is helpful.
73
Evan
AC9TU
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Thanks.? Interesting idea.? I'll take a look.? Do you have a link to the battery you are using?? If I had a 24v input would that be too much for the PA?
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Hi Dave,
The cheapest and easiest way to achieve ~20w output is to supply a higher voltage to just the PA part of the uBitx.? For version 3-5 at least there is a separate input pin on the PCB for supplying a different voltage to the PA. I don't have a v6 so cannot tell if that has a similar design, but even if it doesn't it should be easy to look at the schematic and find a suitable place for cutting a track and supplying a separate PA voltage.? I have a Li-ion battery pack for portable use, it is around 18-20v and with this I get around 20-25w output on the lower bands which is what I use. I have added an internal 7812 12v regulator to feed the 12v input with 12v from same battery, this needs to be mounted on metal in order to have cooling, and i have done the same with the 7805 5v regulator on the radiuno?which I found to get a bit hotter than what I find comfortable. One could use DC-DC converters instead, but there is a high risk of interference from them so beware.
Do NOT supply 20v to the entire uBitx as that will let the magic smoke out.
Even without modifying to have a single power input, having 2 battery packs for separate voltages should be cheaper than an external PA....
Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.??
|
Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Thanks I will take a look.? Is that a 12volt kit I've seen those listed but I don't think they listed the input voltage or I've seen some listing 24v input.
Is there a good low pass filter you would recommend for that for 40 meter?
Thanks.
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Re: Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
On Sun, Oct 24, 2021 at 03:35 PM, Dave Space wrote:
Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
You could have a look at these??? ?? ???????????? DIY? kits? 70S? SSB? Linear HF Power Amplifier? MINIPA70 for YAESU FT-817? KX3 You will find them on the auction sites. Ignore the "for Yaesu FT-817 KX3! as they can work with any rig. These come as a kit and you will also have to buy or make low pass filters for each band you want to use. They require some work on your part but the information is out there if you look. There is even a video showing the build process. Look on YouTube for a video by KC1JTS???? Assembling the DIY kits 70w SSB linear HF power amplifier. I have one and made low pass filters for it. Reg??????????????????? G4NFR
?
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Re: HELP on Gerber Files of M0YTH
Hello, Some news of my new PCB design (Cocorico Ubitx V2) It's finishhed at 90% it's M0YTH pcb with SMD compounts + some adds on. More news when completly finished. cdt  
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Increase uBitx to 25 watts internal or external amp with 12v supply for portable use
Hi are there any relatively easy ways with a 12v supply to increase the uBit v6 to 20-25watts mods or external amp.?
I'd like an amplifier for portable use.? I have a 12v supply I use at present for uBitx.? Trying to find something to just get enough power to get out the signal better than its doing at 5-10w now.
(Looking for something kit or with boards/parts list thats easy ideally as I'm probably just an intermediate level builder.)
Thanks
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Sunil Lakhani
Mark Erbaugh
Gerard