Re: Homebrew is alive and well in Vienna Virginia #homebrew
Dean said:toggle quoted messageShow quoted text
> Similarly the decision to use a commercial filter and mixers was a design decision to increase the likelihood of success for the first time builder.
I get that.
I would probably use ADE-1's if I were to build such a thing.
> As far as citing sources - most of the modules are pretty standard circuits that derive from many sources.
> The bi-directional IF module is decidedly not a ubitx derivative. The bidirectional amplifiers
> that comprise it are documented in EMRFD and were originally in a Plessey Manpack.
I can't think of an actual use of bidi amps in ham gear prior to the uBitx, but otherwise, it's all pretty stock as you say.
Few construction articles bother to cite precedents, but I do encourage the practice.
Modules are good, and that has come up in the forum with regard to *Bitx* builds.
Several advantages, allows easy testing of individual modules, you can stack them like Legos
to build something different, an be individually shielded if necessary and have independent power supply filtering.
Though auto-inserting an entire Bitx40 or uBitx onto one board is simpler and cheaper.
> There is no "complete schematic" by intent. This is a project for for inexperienced builders and we take it one module at a time.
This I will argue with, sounds like a rationalization.
Describing each module separately does not preclude having a complete schematic.
I considered printing out the dozen or so pages of description, cutting out the schematic bits that mattered,
figuring out was was old history, then gluing the schematic bits together following the various block diagrams.
Concluded it was not worth the bother.
I can't imagine that process is any easier for inexperienced builders who aren't being mentored.
But tastes vary, perhaps some would find the big picture too overwhelming.
On Sat, Apr 17, 2021 at 11:07 AM, Dean Souleles wrote: