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The few converters like that I have tried are almost like DC transformers if there were such a thing. not counting for the loss in the circuits, the power used vers the power input is a ratio. Meaning

Hi Jerry, Thanks for your reply and links. It makes sense that they would specify the converter current on input current (based on what the switching transistor can handle), as the output voltage is

Jerry, Regarding the BFO, after the master oscillator is calibrated to an accurate frequency, the BFO MUST be calibrated to the individual uBITX crystal filter as no two of them are exactly the same.

Jerry, You are right, I did use my calibrated HP 5384A frequency counter to determine the crystal frequency. I had forgot that. I found calibrating the hardest part of building my last uBitx

Don's method assumes you have an accurate frequency counter, most uBitx users don't have one There is no reason we can't calibrate this rig accurately using an off-the-air signal such as WWV or an AM

Ok I have found the issue. Due the fact I have used the nextion for previous projects, the fixed baudrate in them was changed. I have fixed that by placing the command? "bauds=9600" on page 0 in the

No, adjusting the BFO frequency is a bad idea. That will change the audio characteristics on both transmit and receive. And it will only "calibrate" the rig when operating at the frequency of the

My screws were all Phillips on the one that I have.

Sorry Dave was using a ubitx also..

I have the same issue with both of my uBitx’s only on 40 meters. Last weekend I was at Lobstercon and Dave kd1na on his bitx40 also suffered from RF getting into his but again just on 40 meters. The

Look at fig 2 of that wikipedia page for the boost converter: ? ??? ??https://en.wikipedia.org/wiki/Boost_converter If the inductor is large enough, the inductor current will be constant. When

I believe most of them use TORX (also known as Star or Spline ) screwheads. Probably T-8 or T-10 size if I remember right. Jim - W0EB

Hi Kevin, What tool removes the screws holding the Baofeng microphone together? My small Phillips screwdriver doesn't work on it.? Thanks, George, k1DX

The USB input to the raduino is particularly vulnerable. Ferrites there are a good idea, and also use a one to one current balance on your antenna cable. The cause is unbalanced feedline currents

I had the same issue with my Yeasu when I first started using Fldigi. I put snap on Ferrites on the audio leads and wound the control cable about 6 turns around a ferrite toroid and that solved the

Bill, That makes me car sick if I keep watching it:-) It is cool though. I made my best QRP DX contact with a Hendricks Bitx17. From S. Oregon to Antarctica Joel N6ALT

Maximum available output current will fall drastically as the output to input voltage ratio rises. You might get 4A out if the input voltage were about equal to the output voltage, it falls off from

Jerry, I agree that calibration is a 'exercise', why does it need to be this hard. I'm no coder, but Don ND6T's calibration routine worked really good for me when I was calibrating my Bitx 60,

Hi John, I assume that you are using a computer connected to the radio since you are running WSJT-X AND CAT. It may be the computer that is being tickled by stray RF. How is your RF ground configured?

I have noticed this as well. For example when you set the step size to 50 Hz if you tune quite quickly it seems that the step-size increases.? Are you sure that this isn't intentional ? ?I see to