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Probably due to biasing of Q70. Try change R50 to 180K and/or R51 to 2.2K, that should change the Q70 collector voltage and give you more amplitude before clipping. Raj

Yes, good. I overlooked a failing solder joint onto my bnc connector and it was terrible trying to trace that down. Can you check the reference clock crystal on the raduino, Y1 at 25MHz? What test

Hi! Sorry, was the ubitx 4. oops! Anyway - I checked at the two mixer stages. TP17/TP20 are fine. TP21 is where the distorted sine wave shows up. -adrian

The only difference between a v3 and v4 is the audio section.? Where exactly are you measuring the distortion? 73 Evan AC9TU

I would like to buy a set in the US. Chris

hi! I'm poking at my ubitx 3.0. It hasn't behaved well at all on either transmit or receive. It turns out it was very not calibrated and balanced for transmit, so I've fixed that. However, receive

Raj, Should the diode and light mod be made to the uBitx v3/4 boards as well?? Seems like a good thing to do to all of the bitx versions. 73 Evan AC9TU

Among the various experiments, and understanding the requirements set by Farhan I can suggest these two options: 1) 0.96 - 1.3 inch IIC Serial OLED Display 128X64 I2C SSD1306 2) Nokia 5110 84x84 pixel

Jack, and others... After a bit of research, it seems that there are older and newer devices listed as 128 X 64 displays. The older ones look like a traditional 1602 style LCD while the newer ones

Here's a site which describes this needed mod (ask me how I know) among a few others, and includes pictures of the diode

The 2nd receiver did the trick. Thanks.

I am slightly confused. "At pin 12 of K1 relay solder 2 4148 diodes in parallel but in opposite polarity." Where is the other end of the diodes going? Would you have a picture? Thanks David N1OMO

Sunday 3pm & 7pm Your Local Time Starting at 3pm & 7pm EST? 7.177 and 7.277 up or down as conditions requires? QRO only as conditions require. -- David ?N8DAH Kit-Projects.com (

What frequency and time for the net?

Farhan, Arv: It would be interesting to know how many people use the ?BITX in an environment where "off-the-grid" power is used. I have no idea. Clearly, I'm aiming at regular power sources. The

^? This is this is why, when possible, I like to have the second receiver on AM and listening to WWV on both radios. That way, I'm actually comparing their approximately 800 cycle (?) tone with my

Looks very good. Hope you catch that Sunday net. I'd want to try catching the Noontime Net, out of New Mexico, which I caught before. I hope to get mine done enough for a few pictures this month,

FarhanYou have echoed my feelings about CAT interface, except that i would think it needs to evolve instead of being thrown away.? CAT as a link interface may be adequate.? It is how we use the data

Working, tnx . Now I try to make PCB Board. 73 Matjaz S56ZVD Sent: Friday, February 15, 2019 5:45 PM To: [email protected] Subject: Re: [BITX20] Sweeperino? Karl's answer will fix your issues. You

What software are you using in your v5 uBitX, John? I know my v4.3 sketch did not follow the described sequence on the HFSignals site and when put into calibration it started transmitting on 10mHz.