Dodd P. (ed.) Low Frequency Experimenter's Handbook

Radio Society of Great Britain, 2000. — 111 p. — ISBN: 978-1872309651."The LF Experimenter's Handbook" has been written to meet the needs of amateurs and experimenters who have an interest in low power radio techniques below 200 kHz. Most of the techniques described are targeted at those using the 136 kHz band, but they are also of great interest to readers in New Zealand and Australia with the 183 kHz band and the Lowfers in the USA on 180 kHz. The bulk of the material in the book comprises contributions from experimenters world wide and covers antennas, propagation, transmitters, special modes and test equipment, and discusses some applications such as communication with caving enthusiasts. All those interested in exploring the new frontier of the LF bands will welcome this invaluable and unique reference, whether they tend to transmitting or are content just to receive.General.
The LF station at Cesarc Tagliabuc I5TGC.
LF operation from the Puckcridge Decca Station.
Portable operation from Amberley Industrial Museum.
Photo gallery.Receivers.
LF receive systems.
LF converter from 136kllz to 14.136 MHz.
Receiver amplifier and loop antenna for 136kHz: Andy Guye F6CNI.
A 136kHz high performance receiver converter: John Moore G4GVC.
A simple signal canceller for 136kHz: Derek Attcr G3GRO.
The GW4ALG noise canceller Steve Rawlings GW4ALG.
Outline design for a narrow bandwidth LF receiver: Andy Talbot G4JNT.
An audio clipper for headphones: Dick Rollema PA0SE.
A sensitive loop antenna for 136kHz: Tony Preedy G3LNP.Transmitters.
Crystal mixer exciters for 136kHz: Peter Dodd G3LDO.
A transmitter for the 137kHz band: HaJo Brandt DJI ZB.
A crystal/mixcr for 137kHz transmitter: Peter Schnoor DF3LP.
A transmitter for 136kHz: Dick Rollema PA0SE.
A 400 watt transmitter for 136kHz: David Bowman G0MRF.
A 136kHz lkW transmitter: Dave Pick G3YXM.
A 400 watt power amplifier using 572Bs: Steve Rawlings GW4ALG.
LF power amplifiers using a bridge configuration: Peter Dodd G3LDO.
Pulse width modulator for class D power amplifiers: Andy Talbot G4JNT.LF antennas and coils.
LF vertical antennas: Bob Vemall ZL2CA.
A guide to LF Antennas: Peter Dodd G3LDO.
An inserted LA' antenna for LF: Peter Dodd G3LDO.
A helical antenna for 136kHz: Tony Baertschi HB9ASB.
Balloon-extended vertical LF Antenna: Steve Rawlings GW4ALG.
A limited space 136kHz antenna: Rik Strobbe ON7YD.
The loading coil: Peter Dodd G3LDO.
Low frequency coil Q: Bill Bowers.
LF variometer design: Tony Preedy G3LNP.Specialist techniques.
Narrow band techniques: Rik Strobbe ON7YD.
Receiving and transmitting slow CW: Peter D.xld G3LDO.
Low speed Hcllschreibcr on LF: Andy Talbot G4JNT.
PSK31: a new radio-teletype mode: Peter Martinez G3PLX.Test equipment.
Simple test equipment for 136kHz: Peter Dodd G3LDO.
The ScopcMatch tuning aid: Jim Moritz MOBMU and Lech Laszkicveicz G3KAU.
A Held strength meter for tlte 137kHz band: Dick Rollema PAOSE.
Measurement of antenna system impedance: Peter Dodd G3LDO.The earthing resistance of antennas Dr Eng A Meissner.
General information.
Crossing the Atlantic on LF.
Data on the H1P4080 full bridge FET driver.