RADIO HABANA CUBA
 Dxers Unlimited
 with Arnie Coro, radio amateur CO2KK
Regen RX Using Q-multiplier Principle
 by Graham Firth   G3MFJ/W3MFJ

Firth's Regen RX 

     Band       Core  Colour Primary Secondary Wire dia
============== ====== ====== ======= ========= ========
1.55 -  3.1MHz  T37-2   R      12      110      0.0090
4.10 -  8.1MHz  T37-2   R       6       36      0.0115
9.10 - 17.5MHz  T37-2   R       4       16      0.0135


The detector is very closely based on a design in a Sprat of some time ago called the Nickie. It is what used to be called an "Anode Bend" detector -- now probably called a "Drain Bend!" -- used because it is a high impedance across the coil. The Q-multiplier bit is a Colpitts oscillator with its gain, hence the regeneration, controlled by a variable resistor. This should be at least 1 - 10 turn pot -- the value doesn't really matter as it is just a potential divider (anything from 5K - 100K should be OK). The RF stage and the audio amplifier were culled from circuits in other Sprats. Graham Firth

Questions? Send e-mail to Arnie Coro

Back to Dxers Unlimited
To RHC Homepage