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You could add relays and pots to adjust power across bands.? I'm thinking about using the current system for 'max out' and a second layer for 'max 5W out' when feeding my WA2EBY.

Thanks for the feedback from all of you. Allison, I wonder if that pot could be brought out to the front panel using some silver/teflon coax for the round trip without creating too many isues? Or is

There is a strong broadcast signal on 7275 which is putting a fairly strong carrier on 7277.? Not good for weak signal work.?? Seems to me the calling frequency should be moved to someplace below

I had the same problem. (Well, at least I thought I did, turns out it was a PICNIC error). Put the radio in CW mode, and find an AM station. Hope that helps. Dave - AI6K

Hi Simon, I don't think this is true.? What is true with homebrew, is that the device doesn't not have to be tested by the FCC; the spectral requirements are still the same, but it is up the the user

Seem to hear that self build, home brew is more relax under fcc laws than mass production factroy machine, to allow progress in test, training, education, etc., in principle. Still want to emit a as

If i buy a new one, is the good relay come with present version? Or it is consider a user mod, that i need to buy my own good relay 73 Simon

Rf pickup on adc can be observe by loading an adc read arduino program, on serial monitor. Use handheld 2m tx with ant near the push button and wiring 73 Simon [email protected]> wrote:

Garbage in, garbage out. MRM

As is kit without mod, How much power output is ubtx and btx40, for 100 percent continuous digimode? Should i use a larger heat sink? Can output higher with higher voltage and bigger heatsink, for 100

Connect multiple thick ground wire from pcb , said rf plug, to multiple point of case, for each piece of casing metal plates. Contact between metal plate is not fully reliable, in strict sense. 73

Charles French, just back down RV1 on the bitx.? or better yet start at 0 (FYI its counter-clockwise to max not min as its backward) and run it up till the 1208 gives full power using CW.? Since the

So, for current version that if i buy today, is it basically true that the overall story is 1. btx40 is just meeting fcc spec, i believe is 50dBc for lower freq, 2. Ubtx is just a bit short, but not

I had the same issue with a metal case. The interesting thing for me was that on a single band 20m dipole I did not have the issue. When I connected to a tri band (40/20/10) I started having the

Is there a publicly published circuit diagram for the push button and tuning knobs, connect to p1 of radioduno, that marked as a0 to a?, analogue input. Some switch use adc, switch resistor, so each

Simon,? The structure of the amp is not the sole element of the question.? I have a single ended that beats the push-pull of the ubitx by miles.? I also have a QSX amp that is push pull and is very

Clark, Its not solely the relays.? Its also the interaction of the pcb routing of the interconnects. lower the C of the contacts or better routing and the problem disappears. Since the bitx40 is

The output filter relays in the uBitX are double pole double throw, one pole switches the input of the filter, the other switches the output of the filter. The original relays have too much capacitive

Ground loop somewhere? Is it connected with other stuff except the antenna?

The push pull has the advantage to deeply attenuate the even harmonics, all versions of the ubitx were good in that, the issue was on odd harmonics, 3rd, 5th.... With push pull a less steeper low pass