Tunable active aerial for SW

EE 116 July/August 1986 96i tuneable active aerial for SW 4 KV1226 BF256C T BO G BF256C L41 4mH7 L51 4n,H7 C2 1 II 10n 14 C32. 72n 10 IC1 733 1mH I 1mH R7oR2R4R3 R6 Many of the modern, synthesizer- tuned, general coverage SW re- ceivers incorporate the latest types of high dynamic range RF prestages and mixer devices, while the good old tuneable preselector stage seems to have been eradicated in all but the most expensive and sophisti- cated types of multi-mode receiver. It would seem as if manufacturers associate a simple tuning control with an attack on user friendliness of the receiver, while a well-designed, tracked or individually controllable input attenuator would have been a better solution to the problems caused by the worldwide escalation of SW transmitter output levels. A likewise argued plea for reestab- lishing the tuning control could be entered for the active aerial which, while not able to offer the perform- ance of a long wire or multi-band beam aerial, is none th...