Posts Tagged ‘homebrew’

PCB Fabrication Experiments – First Board Finished

After confirming that the HP Laserjet 400 Black/White Laser Printer worked good for toner transfer, I wanted to try the HP Laserjet 200 Color Laser Printer to see if there was a difference.  It actually worked very well, and I used that transfer to complete the process of creating my first PC Board by toner […]

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PCB Fabrication Experiments

I’ve been reading a lot lately about making your own printed circuit boards (mostly on the yahoo group qrp-tech) I have made PCBs before, but only with the photoresist method, which is fairly expensive.  After witnessing the great results by Chuck, K7QO, and with him having done most of the legwork on the method, I […]

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8640 Jr. Power Connection

OK… Last post on the 8640 Jr.  I promise… I still needed to add a permanent power connection for the 12 volt supply to the 8640 Jr.  I decided to use a couple of power poles mounted into the backplate.

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8640 Jr Cabinet

For a cabinet, I chose an old surplus case from some old HP power supply.  I made a new faceplate, and found a suitable way to mount all of the separate boxes that comprise the various stages of the 8640 Jr.

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8640 Jr Attenuator

Now that we have pretty good output on all bands, I wanted to be able to attenuate the signal to be able to use it for receiver testing.  This required approximately 100 db of switchable attenuation.  As a young Avionics Tech in the Marine Corps, I used an old tube-type signal generator called the URM-25d. […]

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