开云体育

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

You're welcome - glad I could contribute in some way. Truth be told, I can't imagine my design is all that great, and I'm sure there are some errors in it. It's not uncommon for me to work through a

FYI I ran glxgears on both the 9-inch and my old Samsung 22-inch HDMI displays and was getting 60 fps. Not? bad for Pi 4B with 4GB memory. -- Jerry Ponko, AC9NM

Hi Tom, Glad to hear that the install worked on your V2. What was the problem with starting sbitx with the desktop icon and how did you fix it.? I don't understand why it didn't work. I've installed

This is an 8 ohms speaker used in some LCD televisions.

Randy, Is this noise going up only when you connect the antenna?

I have a noise floor problem on 40m in my shack. With my other radios I can overcome the noise using squelch and noise reduction filtering. The noise floor is so high with my 40 bitx that I have

BTW: This would not have been possible without the great work by?Mike KW1ND!? Crawling through his Fusion 360 design, it is clear that he must have forgotten more than I have ever learned by Fusion

Happy to report that I have worked the major issues on the design of a sbitx v3 case tha can be 3d printed. Should have it posted on thingiverse and my github by Monday (life is intervening at the