I received this kit from a Ham now SK.? Can anyone help me identify what it is.? Thank you, Richard AG5M

Are you sure it's complete. Can't see a place for the 28 pin IC. And looks short a few of the 8 pin chips. And I don't see a place for the power jack to be soldered in.

Are there numbers on the ICs?

John KY4WW?

Get

No, not sure it is complete. I'm sure there were extra parts from something else in the bag. Another Ham mentioned it is, or might be, an NE4040 designed by NN1G (now K1SWL) and in QST Nov 1994. I'll look in QST. 73, Richard AG5M

It looks like this one which the builder claims was a Small Wonder Labs 40/40

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Looks like it. Maybe some parts from other kits. If he had any QRP Labs kits the 28 pin package could be one of their microprocessors. ?The QCX firmware upgrade was to replace the ATmega328P chip. It's a 28 pin package.

John KY4WW

Judging from the photos and from the 1994 QST article archive, I’m pretty confident it’s the NE 40/40 described by Dave Benson.

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Man, that was over 30 years ago! where does the time go?

Now that you mention it, he did have some QRP Labs kits and I know for a fact he never assembled them. But I did not come across any when I was going through his stuff. It looks as if this it what it is - https://www.flickr.com/photos/kb1awv/2389758695/in/photostream 73, Richard AG5M

Yeah, no kidding. I'm 80 and 1994 was just yesterday. It appears that the kit is a - https://www.flickr.com/photos/kb1awv/2389758695/in/photostream 73, Richard AG5M

Good observation, but I did not provide you with enough details. The ICs are wrapped in foil, not visable in the photo. The 6-pin IC has to be from something else, he had various unassembled kits, stuffed into the same bag. The XTALs are there. I need to do an inventory, but first...

I searched for a manual for this. Came up with some, but my board is slightly different from all the manuals I found online. I just joined the SWKits on groups.io. Will be posting there to see if I can come up with the correct manual. Interesting little project.

73, Richard AG5M

Its SWL 4040 kit.? Been a while since I've seen one but they were popular.

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heres the manual...

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Allison
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Please, private email goes to bit bucket

Thank you Allison.

The manual showing the PCB layout is different than the PCB I have. Look closely at the layout on page 9 in the manual and my picture. The manual is dated Oct 1998. My board says SWL 11/94. So there much be an earlier manual out there somewhere.

73, Richard AG5M

Its likely close enough.

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Yes, some of the torid coils were repalced with canned adjustable coils.

Big visual change and more work (wind coils!) but circuit barely changed.

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OR.... Google is your friend.

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Allison
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Please, private email goes to bit bucket

I did a very deep dig....

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It is indeed the SW40 not "40+" the differnce is toroids replaced with IF cans.

As typical Of Dave Benson he would evolve his kit designs to make them

easier to build (avoids toriodphobia) so SW40 became SW40+ and later DSW....

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I could post the article here as it has coil winding data but its from the ARRL

archive and copyrighted.?

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Its in the QST November 1994.? Its not a build manual but does have the

complete parts list and coil winding data.? If you are an ARRL member

go to the page log in and use the periodical search function plug in

those dates and Benson for the author (his call was NN1G then).

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Allison
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Please, private email goes to bit bucket

That was first thought, three days ago.?

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There is a picture from another poster and that person claims its a 40/40

and the board image matches.? But the SW40 (not 40+) also matches that.

To see that lookup the November 1994 QST.

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Its been verified its the SW40 (SWL 1994) and not the SW40+ (1998)

which was a respin to elimiate toroids.? ?The SW40 was in QST in '94.

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The 4040 was remarkably similar being a superhet 602-filter-602 design.

To say that was widely copied base design with variations would

be an understament.

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Actually in that time frame (and even up to current) there were a lot

of similar radios from norcal, and many others, with similar circuit

topography with the most successsful and eleaborate product

from Elecraft the K1.? The ME40/30/20 ()

available under agreement with Benson and is the SW40+ design.

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I have a few of them.? Also the seemingly rare White Mountain 20

One of the few Benson design for SSB and leading up to the PSK

series (have 20 and 40m versions).

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However the manual to assemble that is truly rare even those the parts

list and schematic is in the 94 QST.? The problem is the board has

minimal silkscreen.

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Allison
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Please, private email goes to bit bucket

"The problem is the board has minimal silkscreen." Yup, that's the main problem. Who knows what goes where. I might have some luck comparing my board to the 40+ board which is nicely silk screened. But that probably won't work very easily. I'd probably have better luck dead bug this than work with the board. For now this project is now on the back burner as I have too many projects waiting their turn. Thanks for all your insight. Appreciate it. 73, Richard AG5M

While the 40+ is the same schematic the board layout is very different.

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Check with Dave Benson K1SWL he is in QRZ.

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Allison
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Please, private email goes to bit bucket

I have done so, hopefully he can offer some assistance. I never like to give up on a project. Just not in my DNA Hi Hi.
73, Richard AG5M