It bugs me that all three si5351 digital logic CMOS outputs are AC coupled into 50 ohm loads. Since it's AC coupled, the 3v pk-pk is centered on ground at the load, and currents from the si5351 are

After your last reply yesterday i went through my entire stash of 1602 displays with I2C converter boards on the back of them. Sure enough two of them didn't work right and now i have the task to

If you plugged the USB cable into a different USB port on the computer, the Com address might have changed. Have you confirmed this is not the case? Mike va3mw

Hello all...i completed the build of my uBITX over the weekend, and successfully loaded CEC v1.06 on it. However, after connecting a few times, its no longer recognized by either PC in my shack. I do

Tim, you should see my bookshelf. Besides databooks dating back the the flood I also learned very early to keep an engineering notebook. Now tehre are maybe twenty or more of them. While I have a

>>>>The mixer is a 200 ohm design. T1 is a 2:1 turns ratio or a 4:1 impedance conversion, i.e. 200/4 = 50 ohm. The 6db pad consisting of R101, R102, and R103 is a 50ohm pad left-to-right and

Below is the s-meter graphics used for the Ten Tec REBEL: /************************************************** * WD9GYM modification for S meter on I2C LCD * Modified for base LCD code by W8CQD

The symptoms and the fact that the hum is 50hz and the local power seems to be 50HZ says your power supply may have developed problems when the TDA2822 failed and the power source is the source of

Just received delivery confirmation on my uBitX kits. Routing was as follows - 19 Delivered - Signed for by xxxxxxx, at xxxxxxxxxxx 10:47 18 With delivery courier MORRISVILLE,

Hello HIdheiko-san, To calibrate the S-meter in more details you can set the values in the array called sMeterLevels[]. It is in the ubitx_20.ino file and is currently : int sMeterLevels[] = {0, 5,

loaded up the new Hex (well not sure how new) was in Chile for the last 10 days. So far no issues of v1.07 that i can see. using HRD you can now change modes. Would like it to coordinate with the

Yes, FCC requires -43dBc for these frequencies. My preliminary measurements (back in December) revealed that, although close, my unit didn't meet those specifications. Close, but not quite. Therefore

Yes a bad spot on the dial for noise. I tried last week but couldn't get out had a bad stock mic. The replacement mic looks identical to stock but seems to offer more modulation. I am getting 10 watts

Or a scope trace capture?

I changed out the nano and the lcd interface board. Now the display works but the software has a problem. It initializes in CW mode at 7250khz. The encoder will not change the frequency. The function

An audio recording of the hum will be nice. Raj

My understanding of FCC rules is that you need better than -43dB spurious content... so 22-28dB wouldn't meet this requirement. If this is wrong could someone please comment? I need to know also...

I Was able to make only two contacts last evening, AI4OT and KE0PVO, then I had very loud, intentional, QRM that swamped everyone so I had to vacate. I hope there were many others out there who were

Hi John, Now I returned from business and I added 2N7000 as AGC level controller and then I replaced time constant capacitor of 1uF to 0.1uF and 0.047uF. Both seems good work and I feel 0.47uF is

Thanks for the great replies, I haven't been through all of the grounds exhaustively, but all jacks/pots/rotary encoders and switches I have soldered are properly grounded to the ubitx main board (0