Oms I am using uBitx newly and i am giving 13.8 v power to the set for RX RX Purpose only ,power supply is transformer base . Do suggest can i use 13.8v Power for RX purpose (no tax right

Why not?

Got my ubitx last week. Made my first contact yesterday with it, and I’m very pleased. 20 meters usb. Used qrp guys un-un plus wire antenna. Chicago to South Carolina. Glad to be a part of the

Hello, I have attempted to duplicate Ian Lee’s success. 1) I have latest firmware and manager. 2) tried 0x27 & 0x3F; neither makes a difference. Display manufacturer says 0x27 correct. 3) Checked

I finally started mods on my µBitx. It was simple enough to do the first mod for RF gain control. No problem cutting the trace between K1 and K3 and soldering the 90 degree pins. The problem started

Hi Miguel, all I saw in the English Google translation of you web page that you had questions about how to get down to 3.2MHz with the Si5351A configured in Quadrature LO. The answer is that you must

Have you tried the display with one of the examples from the library just to make sure that you've 1) got a working display, and 2) it's wired correctly. Often a problem is that there are numerous

i suppose that there is no much difference between 12 and 13.8 Hence you can use it . Otherwise we have to reduce the regulation to get 12.00V output Regards MVS Sarma

Hi, I have just completed the ubitx and put it into a metal case. Everything is working fine except when I try to tune in any station! When a few khz off on ssb the signal is coming in loud and strong

Bill : There are a few I2C scanner sketches floating around. They scan the I2C bus for active addresses and report the results via the serial monitor. It would be worthwhile to try this to verify that

Un-powered measurements: TX pin at relay K1, 180 ohms. RX pin at relay K1, 715 ohms. I hope this information helps you. -- Jon Titus, KZ1G Herriman, UT USA

Thank you very much. Another question; should the original display still be enabled even though ic2 is programmed? Not used at same time, but when swapped back the display acts as originally

My Raduino with display draws 0.100 Amps. Voltage drop across your 47 ohm resistor would be 47ohms * 0.1amps = 4.7 volts. Assuming a 12v supply, that leaves 12-4.7 = 7.3 volts at the LM7805, which

Thanks for all the inputs! I've done lots of work with the regulators over the years. One comment I can add to this excellent discussion is that the output ripple increases badly as the voltage

I'm not sure, but I think the I2C interface expects to use A4 and A5 for the interface. One of the hardware guys can help you there. Jack, W8TEE

Hans, By all reports, the QCX is a great product at a great price. And we appreciate the care you have taken to document this and your other products. I'm curious, have you measured the increase in

Calibration. If you are using stock firmware, it should arrive calibrated. Sounds to me like your BFO frequency is not properly aligned with the passband of the 12mhz crystal filter. Try adjusting the

No worries! Small coax like RG174 is highly suggested. Yes, your workaround is good, don't worry about the stray traces at these frequencies. Use your ohmmeter to insure that you have the right pins.

Here's that excellent post from AA9GG with the pin numbers for the uBitx and Bitx40 relays: https://groups.io/g/BITX20/message/47000 The relay datasheets number the pins as if the device was a 16

I believe that is due to some datasheets having the pin numbering rotated 180 degrees as compared to other datasheets. Clark Martin KK6ISP