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Thank you all for your replies. Much appreciated. I will do more work based on your input and report back on the results. 73, John (VK2ETA)

Maybe. Except it is working just fine at the first mixer on thousands of uBitx's.

It seems the slightest leakage from "open" unbalances the mixer -and an Arduino output doesn't deliver that cleanly. Physically switching the key, direct from the panel socket or by relay, may be the

Ok, zipped in files section, deleted from photos section

Gah!? I guess the website shrinks the file resolution, they are not readable.? Hm.? Maybe there is a way to upload the full resolution pics

Hi everyone.? Someone, I think Curt, asked about spectrum results on 12m/10m which I had not looked at previously.? The screen caps are in Photos (not files) under my call, K0EIA.? If I am reading

Hi Joe, There was a blocking diode fix on r52 that fixed all of my cw issues. I'm going off of memory...but, I lifted r52, on side towards 2822 chip, add diode in series...cathode down to board. I

John, Topology is different between first and second mixers on the uBitx. I'd do your mod as proposed, but cut traces to T4 pins 3,5 and 6. Swap them so T4 pins 3,5 are in from R47, pin 6 is out to

There are hams who might be priced out of the market by that... hams who are technically competent but who are on very limited means.? That's the beauty of the Bitx radios... they're made to be

Iz If I were Farhan - I would move on to other things!? Let's see what's in the future - Given that we have thousands of v3, v4 and v5 around the globe -- I suggest that some merchant(s) kit 'the

I recently installed the 5” Nextion on uBitx Rig. I noticed that on the 10 meter band the CW key sticks when pressed and there is a noisy tone that goes along worn it. I guess this is RF getting in

John, Try a higher value for R104 like 100K preset or pot. The current the diodes need to conduct is very small IMHO. Raj

John, RE:? "The 245mV value did not change significantly when I reduced the R105/R104 values....." If you're looking for a power change via R104, you must increase that resistance value (from the

Ver. 5 cleverly upgraded previous versions tackling most of the? issues. In any case I would move for a ver. 6 if: 1) separate relays were used at the input and the output of the LPF, to be fully

Thank you for the reply Dexter. The strange thing is that the control voltage at the mixer swings from a virtually zero value (0.2mV DC on key up) and a full conduction value at 245mV DC on key

Thank you Ted. That may well be my final option. I was hoping for a software controlled power level as I already do in with the SSB signal by using the gentle (relative to an audio passband) slope

A possibility for the CW just changing amplitude: is the 'unbalancer' driven from an Arduino output? That could be going from low to high - either of which would unbalance. I'm not an Arduino expert,

Here - let me suggest an alternative: 1. Cut trace on either side of? R104. 2. Add a 10k trim pot in series with R104. 3. Adjust new trimmer for desired CW carrier output. 4. Enjoy favourite cold

Sorry for the typo and bad sentence. The first question should read: 1. What can create this reduced difference between the unbalanced and balanced state of the clock #1 mixer? 73, John

After a week working on this mod I need help as I can't come up with a logical explanation as to what is happening. ? My uBitx is a V3. It has a few mods and works well, good receive sensitivity,