Hi Adrian, When you unzip the original files, there will be an .ino file named for the code version. You need to make a folder with the exact same name (except the .ino part) and put all the files int

Hi Rob, What voltage do you read on the other side of the capacitor? IIRC, there's about 4-6VDC on the output of the lm386. If so, then your 2V is not going to matter much I think. 73, Mark.

#ubitx

My own correction :-p "edits" not "ends" 73, Mark

#ubitx

Hi, In the original (lower resolution) wiring diagram on the wiki ubitx assembly page, and on the higher resolution one I uploaded (I didn't make any ends, I just increased the resolution), the mainbo

#ubitx

Hi Woody, You've got double the peak power in your original post, which made me wonder how you came up with it. 73, Mark.

Hi Woody, What I don't get is your calculation for peak power? I guess I'm not to familiar with the calculation and the theory for that. 73, Mark.

Hi Curt, Thank you for the information. It is good to hear more about fixing the mixer spurs. My harmonic spurious are also good, using Alison's relay mod on the wiki and the original relays. 73, Mark

#parts

Hi Woody, Thank you for the data! How were you measuring and calculating the peak power? 73, Mark

Hi, Not to complicate matters, but in old posts I've seen two different inductors being discussed: 680nH ones on a filter, and 680uH ones placed on the relays. Has anyone tested either of those strate

#parts

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 Alison s

The whole kit (with display and raduino) or just the mainboard? 73, Mark.

Hi Jeff, Well that one really is just a CB amp -- the biasing not linear and uses only a diode (a design for CW and FM use) and the output transformer design dated (leading to low efficiency). The AN7

Hi Gus, I think most people haven't had experience with this kind of purchase protection available from credit card companies. I hope they cover it so you can start fresh on a new board! Anyway, you'r

#ubitx-help #ubitx40help

Hi! I think some credit cards offer protection for things like, "Oops I dropped my phone and it broke!" type accidents, and they don't seek money from the vendor, but just cover the cost with profit f

#ubitx-help #ubitx40help

Hi Chuck, Has anyone measured the current that this relay is switching? I wonder if it is exceeding the specification for these small relays which I think is normally 2A max. In general though, I woul

Hi Gus, Well, if you smelled something then likely something got a bit too hot! A couple notes: The black squares on the display is normal if you haven't adjusted the contrast for the diplay yet (smal

#ubitx-help #ubitx40help

Hi, From the schematic you can see that the power input goes directly, and only, to an lm78l05acz voltage regulator. The datasheet for that says it will take a maximum input voltage of 35VDC and and n

Hi Christopher, The schematic shows that the ground connection for the battery pack comes from the power input jack and this becomes disconnected when a plug is inserted there. So there is no circuit

Hi Adrien, See this post: https://groups.io/g/BITX20/message/53765 73, Mark.

Hi Adrien, See this post: https://groups.io/g/BITX20/message/53765 73, Mark.