I’m attempting to understand the I2C pinout arrangements… is the audio codec running on different I2C bus to the Si5351? The schematic for the Codec clearly defines SDC (SCL) as GPIO3 (I2C SCL1)

QSL and thank you. Dave K8WPE since 1960 David J. Wilcox’s iPad

Gerard, The relay you show is clearly is marked K1, what is shown as K1 pin 12 isthe same connected to K3 pin 11 the RX input line. The only path that a nearby TX can send damaging powerinto

I will have to do it. As soon as I finish this accursed sbitx....

Farhan, Is your keyboard connected to your rig via a circuit of some type and uses a stereo three contact plug, not a tip-sleeve two contact plug like most CW rigs. Bill is right on with a straight

Bill, That is what I did (wired a straight key with a tip, ring, sleeve plug and it works. Straight key connected to tip-sleeve or sleeve-ring or something like that…. Just like the Dah contacts

Raj, May you put a simply schematic. On the V6, i think it's K3, but pins have not the good numbers. And Q90 is powered by TX. so... thank's

K3 pin 11 to ground parallel opposite back to back 1N4148 should do the trick. This is RX input line and should take care of Q90. Raj

Hello, I read somewhere: "fit the 2 back to back diodes to protect Q90" Where? Base Emetter? or other. A simply diagram please cdt

Bill, Just i clear up the air, I am a cw operator. I prefer cw ragchew at 10 to 12 wpm because I can copy at that rate in my head while doing something else. However, I send cw as ssb tones from my

Stan, one of the reason that IRF fail with a huge current draw is casedby gate being disconnected or bias being too high.. Rv2/3 ground goingopen. On many of my experimental boars provided by

RV4 is the VOLUME control and in the diagram clip what you havehighlighted is RV1 the power lever set preset. RV4 is not shown in your V4 diagram. Raj At 16/11/2021, you wrote:

Rich that is the drive level to amplifier stages it can be adjusted up or down to vary the output. I adjusted it using the 40meter band and set it to get peak out and then backed it off a touch. I

I recently received a uBitx V4 kit that was 99% complete. It didn't take much to get it working, but now to get it working well... If I can get it operating reasonably well, I may pass it to my

Hi, Cw in the stock uBitX was not very good. Farhan has testified that he is NOT a CW op. In my case I installed the CEC software but I don't think that is the root of your problem. I think my

Ok, I see your idea, Sigi. Very good. When I burnt the trace I was using an ordinary 20a 13.8v switching supply. Now I have the radio on my workbench and I’m using an adjustable current limiting

Hi Dave, I could be barking up the wrong tree or even be in wrong forest but I recall something about requiring a 'stereo' plug on the cable from the straight key and it isn't wired like our legacy

But that doesn’t explain why a set of paddles works using the Dah key when the setup is set for “hand key”. It does work, just uses different connections so processor speed must be

wire the pa separate ... use for first smoke (bench) test a current regulated bench psu (either for onlys pa section or just for the complete rig) if current is too high (blown final or

hi Howard, The answer is no, there is not enough room in the KD8CEC firmware to allow for the screen painting that the stock display requires. The KD8CEC firmware works with one of the text displays