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Lithium-Ion batteries have a voltage operating range of 4.2V (fully charged) down to 2.8V? , hence 1.4V. Question : would 3x2.8V= 8.4V be adequate to operate the Ubitx ? If not I would suggest you

You can load it into the Nextion editor (free download) and flip it (odd number of degrees, not just "180", maybe 270?). Then re-save. ?Try to make sure that the sdcard slot is on top... Makes it

Yes, you can. If you have the .hmi file, open it with the Nextion editor, select Device on upper right hand of command ribbon, select Display on left, select 270 horizontal, and recompile. I compile

I do work T 19v using a laptop adopter selected for low ripple. But , I DO TAKE CARE that a 12v 2 amp regulator supplies to blance circuitry other than the final IRFs. There also the current is

Not a bad deal (as of date of this message) considering those "kits" on eBay that self-destruct upon contact with electricity: https://www.newegg.com/p/0TF-0002-00002

Please don't think of me as obtuse, though, in what way is your rectangular opening "upside down" for the display? I would second the recommendation of using a surrounding bezel to take care of this,

*Curt,* Harmonics.--I have already ordered the new Axiom relays, so I will try replacing the relays first. I have a good desoldering gun, solder wick, and chipquick, so I should be ok there. If that

I don't know about reversal, that would be an elegant solution. Have you considered elongating or opening in the case and covering it with a bezel. Order the next larger Nextion and sell the one you

Nice job Adrien ! 73's Olivier Le dim. 15 sept. 2019 à 22:31, Adrien F4IJA <adrien.grelet@...> a écrit :

About the 12mhz spur, the trap I believe is not that simple. Please let me know a good design without affecting the 30 and 20m bands. Checking it on my SDR receiver is really very low. Il 16/set/2019

Dale I can speak to v3 and v4 because they are similar in this regard. First on harmonics an effective solution involves more isolation in the relays selecting the low pass filters. I am using the

Hello everyone. I'm vuilding a uBitx. I screwed up and cut the hole for my Nextion display with it upside down. Does anyone know if there is a way to flip it in software? I intend to use the CEC

I soon will be the owner of a v3 board.? After having read way too much information on correcting harmonics and spurs, I think the fixes come down to (1) replacing the relays and putting said

Sorry for using "CB amp" as a description, It isn't a real specification anyway.? I just meant a type of amplifier that was gererally of a simple design that doesn't have a lot of features.? As

So, my uBitx is almost finished ! I haven't made some QSO for now, but I tested it like a WSPR beacon and it's OK (6800km of report max). Here some views of the beast : -- 73's Adrien F4IJA

I have rebuilt my HF linear (case and all) and used a BLF-188XR. Had smoked my previous amp board (AN-758) and just set it aside. Hate to see it go to waste. Keep in mind that it will need low pass

Thank you very much for that information, I will try either 450 ohms or 900 ohms, Little noninductive dummy load and a step up balun to match, that should work in the 1 to 3 watt range if I my

Sumit, You grossly over voltaged the LM386 audio amp. Other parts are likely suspect but start? there. Start at the speaker and work back. FYI: the only parts that would tolerate more than 15-16V

Gordon, Short form no.? The 6146 does require power to the grid to run though small. the key thing is you need 25-50V p-p of RF and to do that across the grid resistor and the 10-20pf of input

Hello, My Ubitx ver 4 does not receive anything now. It was working fine till i tried fiddling with an AGC addon and an external audio amp. I was experimenting with the voltage supply and turned up