A 300W Class D Amplifier for 630m
This circuit for 630m, uses 2 MOSFETs in push pull driven by square-waves from a CMOS D-type flip flop. The power can be varied from around 25 to 300W
post 23 Dec 2021
Antenna 136KHz Links →
VLF and 136kHz RX antenna
Antennas for VLF and 136kHz reception
La bande 137 kHz
For 137 kHz the coil has about 200 turns of enameled wire
L.F. On-the-air
With UK amateurs having had access to 136kHz for several years, a lot of experience has been gained matching transmitters to a variety of LF antennas
LF Tuning Meter for the 136kHz Band
When adjusting the tuning and matching components of an LF antenna, it is extremely useful, if not essential, to havesome way of indicating the impedance mismatch at the antenna feed point
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Antennas for VLF and 136kHz reception
For 137 kHz the coil has about 200 turns of enameled wire
With UK amateurs having had access to 136kHz for several years, a lot of experience has been gained matching transmitters to a variety of LF antennas
When adjusting the tuning and matching components of an LF antenna, it is extremely useful, if not essential, to havesome way of indicating the impedance mismatch at the antenna feed point
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