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Copperless perfboard + wire wrap for RF prototyping?

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bd139:

--- Quote from: aneevuser on September 07, 2019, 11:55:54 am ---Maybe I'm being dimwitted, but I can't see what you've done on the solid copper board in the image - it doesn't look like it's been etched in any way, so it looks to me like a continuous conductive layer of copper. This is the side that you're soldering onto? Or is it the ground plane, and you're soldering on the other side for some reason?

--- End quote ---

It's not etched at all. All the non grounded connections are floating in the air. The copper is just ground and nothing else.


--- Quote from: aneevuser on September 07, 2019, 11:57:24 am ---
--- Quote from: bd139 on September 07, 2019, 08:39:01 am ---This does exist. In a professional environment you have “Lego bricks” for RF which are individual boxes with single functions (mixers, VCOs, filters, eval boards, test gear etc) and SMA cables to glue them together. This is large and beyond the realms of the average bank balance unless you go digging around on eBay and hamfests.

--- End quote ---
I guess this is the kind of stuff that Shahriar of The Signal Path often uses? If so, that's way beyond my needs (and pocket).

--- End quote ---

Yes that's the sort of stuff. You can usually pick it up cheap enough in surplus but you can't walk up and build something unless you have a large library of bits.

tggzzz:

--- Quote from: aneevuser on September 07, 2019, 07:52:19 am ---I have one question in the meantime though: ideally I'm looking for an "RF equivalent" of breadboard i.e. a technique that allows rapid mounting and demounting of components (so no soldering) but that works reliably for RF. From what I've skimmed above, I'm guessing that this doesn't exist?

--- End quote ---

Minicircuits https://ww2.minicircuits.com/homepage/homepage.html sell both components and the components mounted in small boxes - for a price. Not an easy website to navigate, unfortunately.

For many "building blocks", you can get naked boards with components in the form of evaluation boards - for a price.

There are many vendors on fleabay that take a manufacturer's circuit from their device datasheets, and put it on a board - for a small price.

aneevuser:

--- Quote from: bd139 on September 07, 2019, 12:43:35 pm ---
--- Quote from: aneevuser on September 07, 2019, 11:55:54 am ---Maybe I'm being dimwitted, but I can't see what you've done on the solid copper board in the image - it doesn't look like it's been etched in any way, so it looks to me like a continuous conductive layer of copper. This is the side that you're soldering onto? Or is it the ground plane, and you're soldering on the other side for some reason?

--- End quote ---

It's not etched at all. All the non grounded connections are floating in the air. The copper is just ground and nothing else.

--- End quote ---

Thanks.

By pure chance, I've just been watching a video by w2aew re: Smith charts etc. Towards the end, he shows the board on which he constructs an impedance matching network:

https://youtu.be/IgeRHDI-ukc?t=645

This looks similar to your board above but he seems to use some kind of socketing for the caps and inductors - this is somewhat closer to what I had in mind when I started this thread - do you have any idea what he is using here? Whatever it is, he seems happy to use it at 14.2 MHz, so it looks like a promising approach for quick-n-dirty RF prototyping.

bd139:
Think he's using gouged boards there. You have to use double sided board for that as previously mentioned

tggzzz:

--- Quote from: bd139 on September 08, 2019, 01:06:13 pm ---Think he's using gouged boards there. You have to use double sided board for that as previously mentioned

--- End quote ---

The "sophisticated" version of gouging is to use a hand-held dremel with a spherical ball tip. In my limited experience it is more controllable.

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