A Reader's Wave-Trap

Radio Record, Volume II, Issue 8, 7 September 1928, Page 30

A Reader's Wave-Trap

An Auckland experimenter sends the following wave-trap, which he claims will give very good results. in‘reasing rather than decreasing volume, Our correspondent states that the trap has been tried out on four dif: ferent sets in Auckland. and proved effective. cutting out 1TYA and enabling Australian stations to be received on

the loudspeaker. An aerial und lead: in totalling 58 feet is used. The trap. it is stated. is also usefu) on a shortwave set. Two sepuraute coils consisting of 42 turns each f 24’s'd.c.c. wire are wound on a 8in. former 43in, long, u space of at least one inch between each. coil. One coil is tapped at the twenty eighth turn from centre, and the other at the fourteenth and twenty-eighth. The aerial * to be tried connected to each-of the taps for best effect.

There bas been no opportunity for the writer to test this circuit. It is given here as it will no doubt interest some experimenters. It does not appear to differ very radically from other . wave-traps in which a tapped coil and variable condenser are used.