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Steve I'm using a Talent Cell 12v battery pack. the battery does provide an additional 5v USB connection. Randy K5UTM

Evan, Yes my Bixx40 dies have the Raduino board. I did watch closely during boot up and I'm getting a uncalibrated VFO error message. in checking the tuning for example I'm finding a station that

In a pinch, you can just download a free audio spectrum analyzer onto your phone or tablet. No need for connections, just “audio couple” between speaker on uBitx and microphone on phone. As said

Hi Randy, I do not have a Bitx40.? I have six uBiTx from v4 on.? When I saw this type of issue that could not be traced to the power supply, it was the BFO.? Do you have a way to verify that the

Hi Randy; Can you provide more details about the 12 volt power cell you are using? Does it by chance include a USB power port, or support other output voltages beside 12 Volts? 73; Steve, N3SB

Have you tried moving the radio to another location? On rare occasions, noise in the form of intermodulation distortion can be produced by a unique combination of strong RF signals near the

I found your design pretty much spot on. Of course there was the usual off by 0.5mm stuff. But that goes with the territory when you are manually recreating a design. The only issues I remembered was

Ashhar, Thank you for the response! Will do some searching to see if I can find an adequate replacement part for those that want to keep your case design while experimenting with a just a sbitx

let's try this again? @?? 285$.......

Gordon, if I had had you as my pre-calc teacher, I might have actually grasped some of the concepts. Applying math to real-world scenarios should be a part of every course, just like science classes.

Ashar ... is it possible to use and connect an wireless headset (with a USB-dongle) to the sBITX v3 ? (Like this headset which works with LINUX

Raj, I only run it off a 12 volt power cell, so I'm not using a power supply. Thanks!

I tested adding "white noise"? (a specific number added to the first 60 bins, to add equal energy to every bin of the voice audio) this morning and IT WORKS. Didn't sound exactly like what I expected

Thanks! In the tx_process, when you have the modulation in the frequency domain, is there a reason not to assign 0.0 to the bins that are above the highest audio component expected? In this section

The audio system uses a WM8731 codec. This samples 96000 times a second and produces 32 bit samples in stereo (only 24 bits have actual data). This means that there are 96000x32x2 , approximately

Gordon, I am going to reply to your two questions in a new email thread to make it easier for others to refer to this. - f

The clue I get is that this is a switching power supply noise. Could even be some device running on the same mains branch. Connect it to a battery and see ? Raj

The noise level does not change when I unhook the antenna. the noise level is more pronounced on the lower end of the phone portion of the band.

Well it TOOK ME several more hours to figure out things that I should have figured out much more quickly.....but I am gaining steam. Ashhar's frequency bins appear to be approx 50Hz? ?(I'm sure

Jerry, the SBITX on the desktop was pointing to the wrong place. Copied from the file and all was well, that has happened to me before. WSJT worked fine. I mostly do CW and WSJT Tom Sent