My QRP CW family of Tuna Cans!
This project combines the 3 Tuna Cans (transmitter, receiver, and amplifier) with a 12Vdc 7Ah gel cell battery, fuse, audio limiter, Autek QF1 (modified for 12Vdc operation), an old computer speaker, and my J-38 key into a portable QRP “system”
The Tuna Can “rigs” can be found on the W1REX website
More details about these pieces can be found elsewhere on my website
This is not intended to be a set of step by step instructions. It is my hope that you will use your imagination, as I did, while building this system. Your goals may be very different than mine! Have fun with it!
Mounting all of this stuff onto a board was my idea, and it has been a lot of fun
Each tuna can is screwed to the board, and then the circuit board is fastened to the can (note: the nut is underneath the can)
The Autek QF1 is screwed to the board using angle brackets
The battery uses angle pieces to keep it from sliding forward/backward. There is a strap across the top of it which is securely fastened to the board. Note also the fuse – don't forget the fuse!
The computer speaker is held with Velcro strips, as is the audio limiter in the red Penguin mints box
My “VFO” is a box with xtals for different frequencies on the 40m band
This has begun to inspire me to learn how to build a real VFO
The plywood was fastened together by two hinges, whose pins are removable
I super glued a push pin thumbtack (with the metal cut off) to each hinge pin to make them easier to grab and harder to lose.
The photo below shows the entire tuna can QRP system.
This photo (below) shows a closeup of the battery (note the fuse in front of the battery, near the bottom of the photo. The white box is the old computer speaker. Behind the white box is a bunch of Anderson Power Poles. The black box is the Autek QF1 audio filter, modified to operate on 12Vdc. The red Penguin mints box contains the audio limiter to save my ears when a strong CW signal sneaks up on me. Finally, note the hinges with the removable hinge pin.
This photo (below) shows (from left to right) the Sudden Storm receiver, the Tuna Tin II transmitter, and the 5W amplifier (ok, I only get 2-3 watts, but who's complaining). One xtal is needed for the transmitter and a matching xtal for the receiver, so I bought a few of them and keep them in the box. I have the frequencies and anything special about them noted in the lid (example: SKCC – 7055khz).
October 2010, I replaced the old, unamplified computer speaker with
an amplified speaker from Radio Shack (277-1008). The amplified
speaker is not shown in the photos, but it put in the same place as
the old unamplified speaker.
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This page was most recently updated on October 16, 2010.