The MRL

The above two The above two photos are earlier versions of completed MRL 2 kits from Paul Nelson's MRL. The current kit design is very similar except as described in paragraph below.

This is a somewhat labor intensive kit to make. Our members have requested that we not change or abandon the original, historical design too much. However, there have been slight modifications. A wider oak wood base is included to provide more space for the addition of an impedance matching transformer system, or other components. The screws to mount the coil are longer to accommodate greater distance between the coil and the front panel (a full 2 inches) if it is desired not to install any or all of the coil tap connections. If you want all of the coil tap connections, then we recommend the coil be mounted closer to the panel to allow shorter lengths of the tap wires, circa 1.25".

We have measured an unusually high Q of the MRL® 2 coil, for a non litz, close wound solenoid coil. The coil form has a lower dissipation factor than 0.22" thick polystyrene, and we use a modern non moisture absorbing insulated wire that provides the same number of turns per inch as the old cotton covered wire.

The heart of the set is the coil, and this set works beautifully with a shottky diode and even better with an impedance matching system. Both a shottky and a germanium diode are provided with this kit.

The above circuit diagram was drawn with Tubepad, a share-ware library of images by Gary Johanson, WD4NKA

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