QSB-01 (qrp-tech synchronous buildathon) #6 – And the fat lady sings!

So after several weeks / months of interrupted building we’re there!

Now admittedly it’s not in the enclosure I wanted to build, which was this

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but you can’t have everything! A PCB enclosure requires the ability to cut reasonably straight lines in your medium with repeatable accuracy. To do this I was planning on using a Dremel mounted horizontally in a 3D printed purpose made frame which converts the drill into a bench saw. Unfortunately part way through printing, my good chum Mat’s printer decided it had had enough and requires a bit of rebuild work and maintenance to get it back working. As such I don’t have a completed table/platform for the Dremel holder.

That said, every cloud has a silver lining. A Dremel would have set me back seventy odd quid, plus the additional hardware for the frame. The cheaper solution was an LMB/Heeger CR-442 painted enclosure from Mouser. Even with the duty charges and shipping I was out for less than a third of the cost of the Dremel saw table project and probably got to keep a few more fingertips into the bargain. If I build another 1Watter (and I will) I’ll look to box it in the bespoke built enclosure if the printer is back working.

So (drum roll please), here it is!

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If you want to save yourself several hours with a set of calipers and some graph paper trying to work out what will fit where (and it is tighter than the proverbial in there!), here’s a copy of my drilling template. Print it at full size A4 and you’re good to go.

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OK, the enclosure needs a bit of artwork to liven it up and to make sense of the controls and connections (separate post for that bit) but the soldering iron is officially cold!

Now on first reveal to those at home, I got a “Ah, isn’t it cute!”

Not what I was expecting! I was trying to build the QRP equivalent of Dr. Heinz Doofenshmirtz’s “Inator’s Inator” here (you have to watch Phineas and Ferb to truly get that one I’m afraid) so people cooing over it is not what your kick-ass QRP radio wants to here. That said it’s a nifty little package.

The best part of a day was spent tinkering with the final setup and alignment as per Chuck’s YouTube video #9.

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This one’s a must. I was really surprised to discover how serious the relationship between the adjustment of C24 and C25 was when aligning the transmitter. I was wondering why I was seeing absolutely nothing on my power meter when I was keying until, Boom! The power was rocketing past 1W in a hurry. All good stuff.

As part of the build up to this project I invested in a frequency counter from eBay. The supplied item turns out to be a PLJ-1601-C which comes with absolutely nothing. Google provides you with a manual in one flavour – Chinese. So, with a little bit of effort here’s an English language version I made using Google Translate.

PLJ-1601-C english translation

PLJ_1601A – chinese language

It’s free and comes with no warranty, acceptance of liability etc etc etc. Just be grateful someone made your life easier for you rather than having to attend night school to learn Cantonese!

** Addendum 29/07/16 – Many thanks to Trevor Newstead who has noticed that for some bizarre reason all of the images have disappeared from my english translation version. I will look to redo the document at a later date but in the short term the original Chinese language version has been added for reference. If you look at the two side by side you can see what’s what. Sorry! it’s on the todo list

With the frequency counter attached to the antenna and everything on a dummy load I get a tuning range of 14.055.86 to 14.060.49 MHz.

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Unfortunately I still can’t get the hang of my Homebrew oscilloscope to get anything sensible out of the frequency analyser to check the spectral purity during transmission, so that’s a job for another day. That said I have managed to get my DS203 to do something useful. Here we’ve got a nice sine wave on keyup!

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The final stage is to design some case graphics, check the output for harmonics and sort out a throw up antenna so I can play outdoors in the sunshine. There’s no point in building a portable rig and sitting indoors when the sun is shining outside is there?

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