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I wanted simple, small and easy to build. Only needs to drive A-D input, so no buffering required and linearization can be done in software if desired. I'm only interested in 30 mHz and 10W QRP max,

Iz oos, Some do some never even thought of it.? The Anan users tend to be very fastidious and? a lot of them use the adaptive feedback (distortion error correction).? Very clean as an example of

Put decent RF devices in uBitx and then we compare for sure... Rahul VU3WJM No, better devices made it more noticeable.? ?There are issues tied to board layout and lacking filters.? Fix them and

Hey, I'm just curious how all the other portable radio compare.... Are they :"clean"? Specs can be that "special" radio, just for testing. Your mileage may vary, Jim W0CHL Read the specs.? If they

Larry, my case but I expect yours as well, it is not the carrier but the unwanted sideband. << First as this is not the first time dealing with this, experience is from many prior radios and the

Tom: So, for the time it takes the hardware to figure out what frequency you are at you maybe out of compliance until the filter switches? Howard

Tom: I think there are a lot of readers here who will be interested in your work. To reduce a POF (point of failure) for those who use the sketch, I'd like to suggest you modify the #include

Switching audio in K3 was inviting pain.? I'd advise cutting traces to m1/m2 and and bridging them pls add the pop fix.

Joe, I suspected its a Brune bridge.? Most of the other forms tend to be larger. All the ones I've built C3 has to be variable or hand picked as its hard to predict due to parasitic circuit

Is this bitx-40 or bitx20 or uBitx? as they are not the same? Since it happens with the loop I'd suspect its the radio.? I say that? as people will run off and blame the endfed half

FYI, I posted the LTSpice schematic, so you can analyze if you wish.If there's interest, I can post the whole LTSpice package if anyone requests it. Joe

That’s probably radio frequency interference. With a slightly Squirrley antenna, you may have RF pick up in microphone cables etc., leading to all kinds of weird behavior. it will look like the

Hello! Finally I made a few first contacts with my uBitx. Mostly I used the antennas at my local ham radio club, which has dipoles for 80m and 40m and a beam antenna for all the upper bands. At these

If your rig still has the M1 and M2 audio cutoff connections to relay K3, then what you are hearing in your audio is not a transmitter issue, but an RF overload condition from the TX output back into

You folks are all saying "carrier leakage". I thought that as well when playing with my rig. It turned out, in my case but I expect yours as well, it is not the carrier but the unwanted sideband. This

Hey, very cool Glenn!!! Also, now I understand what you mean about mounting the relays on the backside. Great work!

the kdcec manual says that it can be set to any ham band does that include the 60 mtr (5 Mc/s) band terry gm4dso

Here's another take on the PCB for the extra LPF switching relays. As per my previous suggestion, fitting the PCB to the edge of the uBITX main board by seam soldering them together. This preserves a

Hi Allison, Thanks for the compliment on the picture. It's a pretty straight-forward Breune bridge, but I'll put up the schematic when I get a chance to edit it with actual values...maybe today. The

Jerry, Thanks again for ur reply. OK, 3 Nanos are on the way now and I will order another 3 Nanos so I can try 6 of them this time. Yes, I know that I need Nanos without pins soldered. Maybe