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Leonard Very good video. For those who were not around several years ago, Leonard KC0WOX played a large part i popularizing the BITX and in helping others build and fix their own BITX transceivers.

HI Allison. I was wondering if you were up to something along these lines... uBitx V2,0? I hope you would share you design so others could reproduce. I am dying to scratch build a uBitx type radio.?

Here's a video of a Hendrix BITX20a looking at the modulation, carrier balance and harmonics rejection. I'm not an expert but I believe my way of testing is relatively accurate. I start out with 16

Thank you Bill? K0WHW

Allison Re. the Elliptical filter...moved spur trap to 23.8. [image: LTspice IV - Cauer_Elleptical_Filter_dip_at_23.8_MHz.asc_042.png] I moved the trap frequency to 23.8 by changing value of L3. Then

What's the difference between the Nextion and the TJC LCDs? Is one better or is it just name brands vs clone? I didn't see any TJCs over 2.8", are there 3.5" screens? Thanks! Vince - K8ZW. -- Michigan

Jerry, All the info is there.?? As to mic gain being a poor solution.? I'll apply your logic. For the people using them it was a easy solution.? They? got the power they wanted and are flying

Allison, This is just some armchair engineering, I don't have gear to easily measure harmonics and spurs at 40dB down. But mostly, I'm kind of lazy. You have been in the trenches, measuring and

What about Farhan's summary statement, on another thread, that "?The harmonics at 14 Mhz and below can be controlled by backing off the drive level" and "I guess that we really need a good ALC to cut

Jerry, The uBitx has been popular because it is simple, would be nice to keep it so.<< Question how are you going to increase the LO/2nd-lo/BFO levels?? Knobs full up (5351 levels) are far from

It's a uBitx. I had this probem since it arrived and when I made first tests with it. A few days later, I built a case from copper plated FR4 circuit board material for it to ensure the shielding is

As Jerry has noted, on my unit at least, the 15 meter “45 MHz-Carrier” spur at 24 MHz is below the -43 dBc limit and therefore not a problem. I checked it again this morning to confirm and found

Yes, I understand the cruft is unwanted mixer products, makes sense. I'm hoping that limiting mike levels, reducing IF gain, and increasing LO injection levels will take care of that cruft. I'm

Allison, Hmm, post 57037 Guess you were talking to Kees then.? ?;-) Good summary of the pitfalls in single conversion. My Swan 100MX has lots of band specific filters and lots of shielding to do

Jerry, which is fully compliant.? ?? ??/g/BITX20/photo/65861/2?p=Name,,,20,1,0,0<<< ( /g/BITX20/photo/65861/2?p=Name,,,20,1,0,0 ) When you get the amp flattened

Allison Interesting thought...I wonder if anybody has tried using the "sub-harmonic mixer" idea in a transceiver design? Having the LO at half the mixer frequency might make things better or worse.

Jerry Gaffke Aug 13???#57035??( /g/BITX20/message/57035 ) Warren's Spectrum Analyzer screenshot of 2W out on 15m shows the 23mhz spur to be 50dB down, which is fully compliant.?

Of course none of that helps the current uBITX owners but shows that in the last 4 years technology things hinted at then the current way. And in there why it came to be this way. Allison

Jerry, It referred to your post? #57037 Its the exercise of why DBMs look easy but make people unhappy. Nowhere is ther e more than one conversion in that discussion or even a receiver. its about

Sorry, the postage was $8.50, total cost was $11.50 -- Ion VA3NOI