Allied Radio Knight-Kit Crystal Set 83 Y 261 Посібник - Сторінка 2
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Друкувати сторінкуThe KNIGHT Crystal Set is the simplest type of radio receiver that can be built. It can be built in a few
hours by an inexperienced person. Having no tubes, it requires no batteries or other form of power
supply. Yet, in most localities, this little receiver, when connected to a good antenna and ground, will give
remarkably clear and reliable headphone operation.
Your KNIGHT Crystal Set is designed to give good selectivity (ability to separate stations) in areas where
several high-powered radio stations are located.
CHECKING YOUR KIT
As you unpack your kit, check the parts supplied against the parts list.
Carefully study all of the diagrams and instructions before you begin. The pictorial diagram shows the
parts as they actually appear. It is best for the beginner to use this diagram since it clearly shows the
position of each part, wire, and connection. The schematic diagram should be used to re-check the
connections and to study "How It Works".
The only tools you will need are: Long-nose pliers, diagonal cutters, screwdriver, soldering iron, and a
good grade of rosin-core solder .
WIRING AND SOLDERING
Before connecting the enamel-coated wire to a terminal, be sure all of the enamel insulation has been
scraped from the end of the wire with a knife. Be careful not to nick the wire with the knife or it may
break when it is bent. Then wrap the wire once around the terminal and clamp it tightly with a pair of
long-nose pliers. This assures a good mechanical connection. Solder must not be used to supply
mechanical strength --its only purpose is to assure a good electrical connection between two conductors.
For most electronic work, a soldering iron rated at 60 to 100 watts with a medium-sized tip should be
used. To make soldering easier and to get the maximum transfer of heat from the iron to the work, the tip
of the soldering iron should be properly tinned. To tin the tip of a soldering iron, clean it with steel wool,
or a fine file, until the bright copper surface of the tip is seen. Allow the iron to heat until it melts solder
when it is held against the tip. Coat the tip of the iron with a thin layer of solder. While the iron is still
hot, wipe the tip with a soft rag to remove the excess solder. The tip should now have a "shiny"
appearance. When using the iron, occasionally check for proper tinning. Try to keep a thin film of solder
on the tip at all times. Re-tin the tip whenever it becomes covered with a layer of scale.
To solder a connection, hold the tip of the iron against the connection until the connection is hot enough
to melt solder. Apply just enough solder to the connection to fill the crevices between the wires and the
terminal. Too much solder will result in a poorly soldered joint rather than a better one. Do not disturb
the soldered connection until the solder has hardened. If the connection is disturbed, you will have what
is known as a "cold solder joint". Cold solder joints are not good electrical con- nections. If you should
accidentally disturb the connection and it hardens with a dull, frosty appearance, re-heat the connection
and apply a small amount of new solder to it.
USE ONLY ROSIN-CORE SOLDER
IF YOU ARE IN DOUBT ABOUT THE SOLDER YOU MA Y ALREADY HAVE, WE RECOMMEND
THAT YOU OBTAIN A NEW ROLL PLAINLY MARKED: "ROSIN-CORE SOLDER
".