02-03-2016, 09:31 PM
The tuned frame aerial I use consists of seven turns plus a single turn coupling winding all wound in a frame which is one meter square. Tuning is by four four BB510 varicap diodes in a series and parallel arrangement. The diodes are wired back to back. A single BB510 offers a wide capacitive swing with a applied voltage of 1 to 9 volts but I considered a single diode not to be a good idea because of the possibility of rectification of very strong signals. However, I am seriously considering replacing the diodes with a conventional tuning capacitor. Varicap diodes do offer the easy implication of remote control but I sure a vaned capacitor will be better.
The aerial is connected to my Pilot X65B. This USA made set offers excellent selectivity because of the triple tuned IF transformers. This feature was continued in many of the early UK made sets such as the U650.
Both these Pilot receivers have an RF amplifier.
One thing is sure there still plenty activity on the medium waveband, at least for the near future I hope.
Geordie McBoyne.
The aerial is connected to my Pilot X65B. This USA made set offers excellent selectivity because of the triple tuned IF transformers. This feature was continued in many of the early UK made sets such as the U650.
Both these Pilot receivers have an RF amplifier.
One thing is sure there still plenty activity on the medium waveband, at least for the near future I hope.
Geordie McBoyne.
