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Updated: June 16, 2025
In this chapter we shall go only into the apparatus used for two simple receiving sets, both of which have a crystal detector. The first set includes a double-slide tuning coil and the second set employs a loose-coupled tuning coil, or loose coupler, as it is called for short. For either set you can use a pair of 2,000- or 3,000-ohm head phones. The Crystal Detector.
These tuning devices can be connected up in different ways and are very popular with amateurs at the present time. Differing from the ordinary loose coupler the variometer has no movable contacts while the variometer is provided with taps so that you can connect it up for the wave length you want to receive.
With a loose coupler, as this kind of a tuning coil is called for short, very selective tuning is possible, which means that you can tune in a station very sharply, and it will receive any wave lengths according to size of coils. The primary coil is wound on a fixed cylinder and its inductance is varied by means of a sliding contact like the double slide tuning coil described above.
The secondary coil is wound on a cylinder that slides in and out of the primary coil. The loose coupler, which is shown complete at B, costs in the neighborhood of $8.00 or $10.00. Fixed and Variable Condensers.
Jedge, fo' we goes any further lemme ast you a coupler questions, please, suh. Is it true dat over dere in some of dem Youropean countries black folks is jes' the same ez white folks, ef not more so?" Choosing his words, the old man elucidated his understanding of the social order as it prevailed in certain geographical divisions and subdivisions of the continent of Europe.
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