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This switch and fuse block is the same as that used in the experimental set. The Protective Condenser. This is a fixed condenser having a capacitance of 1 mfd. and will stand 750 volts. It costs $2.00. Connecting Up the Transmitting Apparatus. From all that has gone before you have seen that each piece of apparatus is fitted with terminal, wires, taps or binding posts.
This is made to take care of a 10 volt current and it costs $10.00. The Filament Storage Battery. This must develop 12 volts and one having an output of 40 ampere-hours costs about $25.00. The Protective Condenser. This condenser has a capacitance of 1 mfd. and costs $2.00. The Motor-Generator.
Connect the binding post end of the primary coil with one post of the variable condenser, connect the other post of this with one of the posts of the .00025 mfd. condenser and the other end of this with the grid of the detector tube; then around this condenser shunt the grid leak resistance. Simple Regenerative Receiving Set.
Connect the binding post end of the primary coil with one post of the variable condenser, connect the other post of this with one of the posts of the .00025 mfd. condenser and the other end of this with the grid of the detector tube; then around this condenser shunt the grid leak resistance. Simple Regenerative Receiving Set.
Now connect one end of the secondary coil to one post of a .001 mfd. variable condenser and the other end of the secondary to the other post of the condenser. Shunt 1/2 to 2 megohm grid leak resistance around the fixed condenser and then connect the second post of the variable condenser to one terminal of the detector tube filament.
Get two honeycomb or other coils of the greatest wave length you want to receive, for in order to properly balance the aerial, or primary oscillation circuit, and the closed, or secondary oscillation circuit, you have to tune them to the same wave length; two .001 mfd. variable condensers, though fixed condensers will do, and two small single-throw double-pole knife switches mounted on porcelain bases.
Connect the + or positive electrode of the A battery with one post of the .001 mfd. fixed condenser and connect the other post of this to one of the ends of the secondary coil of the tuning coil and which is now known as the tickler coil; then connect the other end of the secondary, or tickler coil to the plate of the vacuum tube. An Efficient Regenerative Receiving Set.
Since the farad is far too large for practical purposes a millionth of a farad, or microfarad, whose symbol is mfd., is used. What Inductance Is.
Next connect one post of the .0007 mfd. condenser with one of the terminals of the detector filament; then connect the other post of this condenser with one post of the .0005 mfd. variable condenser and the other post of this with the grid of the detector, then shunt the megohm grid leak around the latter condenser.
None of these coils is variable; all are wound to receive waves up to 360 meters in length when used with a variable condenser of .001 mfd. capacitance. In other words you slide the coils in and out to get the right amount of coupling and you tune by adjusting the variable condenser to get the exact wave length you want. With Compact Coils.
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