KA1TDQ
- Jon
LAVEEN, AZ
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Jon writes: This is my current shack with my new homebrew dual 3-500 floor model amplifier. I'm now using my single tube AM transmitter on 40 meters while using the NS-40, a Class E CW rig which is housed in the aluminum chassis on the desk, as the exciter. I run the transmitter and amplifier combo at 200 watts carrier. An Alinco DX-R8 is the receiver and I use a dipole for the antenna. Click here for a larger photo (~2.5 Megs) |
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This is a plate modulated transmitter using a single 7984 tube. Both RF excitation and audio are external using 50 ohm and 8 ohm inputs respectively. The modulator uses a Heising circuit and power output is 20 watts. Click here for a larger photo (~3.5 Megs) |
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On the amplifier, the plate choke was made from four pieces of 1/4 round ceramic tile glued around a wooden dowel. The filament transformer is 6.3 volt, 30 amp center tapped but fed from a huge isolation transformer with 105 volt secondary taps. This brings the filament voltage down nicely to 5.0 volts. The plate transformer is vintage 1940's from a BC-610-E WWII transmitter. |
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More rig pictures may be found on the QRZ page for KA1TDQ |
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