Variometer Design
A variometer consists usually of two coaxial coils, connected in series, where the coils relative position can be varied in some way
post 23 Dec 2021
Antenna 136KHz Links →
630 meter antenna Limited edition
Due to the increase of sunpanels and PLC devices, the HF radio spectrum is more and more polluted. Add to it that in NL there is certain group of sunpanel "pioneers" who consider themselves capable of installing these devices by themselves
A Really Simple LF Receiving Loop
The transformer in the picture is an FT-50-77 core with two turns on the primary and 20 turns on the secondary
A 2.5kW Decca Clone Class D Amplifier for 136kHz
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
A Quarter Kilowatt Amplifier for L.F.
The amplifier described, uses four low cost Power Fets to generate 250 Watts output on the European 136 kHz L.F. allocation. The circuit uses traditional RF construction techniques, and has 50 Ohm input and output impedances
A simple 137 kHz MEPT for the beginner LF enthusiast
The description of an easy to reproduce transmitter for LF that can be used as a MEPT - Manned Experimental Propagation Transmitter
73
Due to the increase of sunpanels and PLC devices, the HF radio spectrum is more and more polluted. Add to it that in NL there is certain group of sunpanel "pioneers" who consider themselves capable of installing these devices by themselves
The transformer in the picture is an FT-50-77 core with two turns on the primary and 20 turns on the secondary
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
The amplifier described, uses four low cost Power Fets to generate 250 Watts output on the European 136 kHz L.F. allocation. The circuit uses traditional RF construction techniques, and has 50 Ohm input and output impedances
The description of an easy to reproduce transmitter for LF that can be used as a MEPT - Manned Experimental Propagation Transmitter
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