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W1TAG / WD2XES / WE2XGR/3    John K. Andrews   Holden, MA FN42ch  

Important Note: While the FCC has approved regulations for Amateur operation in the U.S. on 630 and 2200 meters, access to those bands is not yet permitted. The Office of Management and Budget must first approve some elements of the regulatory structure, and the Utilities Telecom Council must establish a coordination procedure to satisfy concerns about interference to PLC operations. Until that happens, and the actual coordination takes place, U.S. Amateur operation at 630 and 2200 meters is forbidden. Should "pirate" transmissions take place, it is possible that the whole process could be set back.

LF/MF Transmitting

137/472 kHz Power Amplifier
137 kHz 5 Watt Amplifier
137 kHz Exciter
472 kHz Exciter
185 kHz Lowfer 1 Watt Amplifier

LF/MF Receiving

Use of Balanced Transmission Lines for LF Receiving
518 kHz Elliptical Filter
LF AC Line Filter for Switching Supply

LF/MF Antennas

LF/MF Transmit Loop Antenna
MF Transmit Loop Antenna
LF/MF Receiving Loop Antenna

LF/MF Test and Measurement

Sampling Rate and Receiver Frequency Calibrator
LF Field Strength Measurement
Homemade RF Ammeters
GR 516C Calculator
Receiver Calibration with Loran Lines
Use the WOLF GUI and Loran to calibrate your sound card sampling rate.

LF/MF Operating Modes

Modes for LF Use
Modes for MF Use
WSPR-15 vs. WOLF Comparisons

LF/MF Experimental Operation

WD2XES License
WE2XGR License
WE2XGR/3 Log

AM Stuff

2-Tone Test for AM Modulation