Looks great, Jim! Care to give details for the VFO knob you used? Thanks, Andy KG5RKP

#ubitx

Vince - on 40 meters the prototype WA2EBY drew about 4A from 28V. Both of the original QST articles are here (in English) along with a 100W variant (in German): http://www.qsl.net/do2sw/100W%20PA.pdf

Rob, I can also recommend the WA2EBY linear - it works great with my BITX40v3 using a 7dB pad. The next linear I'll build is the EB63A from Communication Concepts. It's been confirmed to work with a n

Maestro (and group), I ordered a 5-crystal lot of both A and B from the Aliexpress vendor back in November. They finally arrived today. Both lots appear to be identical visually, and both are marked 4

Not a waste at all - Congrats! \o/ Andy, KG5RKP

Farhan reported that C210 and C216 weren't needed in the final circuit. They appear to be artifacts from the original 45 MHz BPF, which is documented here: http://www.phonestack.com/farhan/ubitx/ubitx

#ubitx

Ref: Item 6 (Keying interface for a linear.) http://bitxhacks.blogspot.in/2017/12/adding-external-linear-amplifier.html

Farhan used the same sort of one-turn variable resistor tuning on his prototype µBITX that he used on the BITX with Raduino (and on his Sweeperino), so you probably did see his µBITX video. https://ww

My pleasure! I remembered reading it but couldn't immediately find it when I 'needed' it. (Story of my life. LOL) Thanks for blazing this trail - I look forward to getting my rig on the air when it ar

As for an under $300 follow-on to the WA2EBY project, how about the EB63A? It's also reported to be a very straightforward assembly project. http://www.communication-concepts.com/eb63a-140w-hf-amplifi

Useful? http://www.hfsignals.com/index.php/ubitx-tuneup/

I use their I2C LCD backpack boards and their SI5351 board (which can be fed either 5V or 3.3V). They have kits of machined header pins and sockets, and rotary encoders, as well. And the little red bo

#parts

I don't know what specific parts W7ZOI used. There's very little power flowing through this filter, though, so it should be easy duty for the components. I used these: https://www.mouser.com/ProductDe

#ubitx

http://www.earchi.org/92011endfedfiles/Endfed6_40.pdf Doesn't look like rocket surgery - Chris gets my vote. I've got everything I need to make one but don't have room to stretch one out. I guess I'll

Kerr, I found this to be useful as well - the author used the same resistive matching process: http://vk2sja.org/piffle/2014/10/crystal-ladder-filter-20mhz/ I'd be interested in hearing how the number

Hey David, The RF sensing has functioned perfectly for SSB and for digital modes. I'm not a CW op yet so can't speak to that. I would think, though, that with the designed-in hysteresis that the code

Hey Brian, The coil info on the hfsignals page looks like a copy/paste error. the numbering is correct on the V3 schematic and the coil values look reasonable. I'm gonna bet that the second listing fo

#ubitx

If you're going to stay with SSB or CW and are looking for a heatsink very close to the discontinued one used in the WA2EBY build, this works well: https://www.mouser.com/productdetail/967-haf15t I us

I used the Adafruit Si5351 board and an I2C display backpack when I built the freq gen for my pre-raduino BITX40. I'm doing the same thing for my µBITX build. Adafruit's board has a 3.3V regulator on

Thanks for your help, John. I was very surprised at how far the noise floor dropped once the transformers were added. As much as I want to get the receiver working, I can feel a strong pull down the Q