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136 kHz Projects - Amplifiers

Click to enlarge100 Watt 13.8 Volt Amplifier for LF by GØMRF
This Class D switching amplifer was designed to enable anyone with an interest in LF to get onto the band quickly and without the need to invest in a separate higher voltage power supply.

Klik voor vergroting136 kHz preselector and amplifier by IK2PII
This project was developed to reduce the image frequency response of my direct conversion receiver. It can also e useful as front end for HAM communications receivers and also for selective level meters used as LF receiver. The project focus was selectivity, not gain.

Click to enlarge400 W Power Amplifier by GW4ALG
The 400 W power amplifier (PA) uses many of the components from an old KW1000 HF linear amplifier (including the original pair of 572B valves). The amplifier was purchased for under £200 and has been modified from a switch-tuned grounded-grid configuration to an aperiodic (untuned), push-pull amplifier, rather like the QRO Class B Modulators of the 1960s.

Click to enlargeA 300W Class D Amplifier for 630m by GØMRF
This amplifier is based on the ‘300W Class D Transmitter for 136kHz’ published by the RSGB in Radio Communication and reproduced in the LF Experimenters Handbook by Peter Dodd G3LDO.

Click to enlargeA 400 Watt Low Frequency SSB Linear Amplifier by W5JGV
After obtaining a pair of surplus Motorola Starpoint channel modems to use as SSB exciters at WC2XSR/13 on 168 KC, I wanted to build an amplifier to boost the power to about 400 watts, which is the maximum licensed transmitter output power for WC2XSR/13.

Broadband 5 Watt Amplifier for LF and MF by GØMRF
If you are getting started on MF or LF and plan on using the low level output from an SDR radio, or a homebuilt transverter, then you will probably need an amplifier with high gain and enough power output to drive a larger power amp.

Quarter Kilowatt Amplifier for L.F. by GØMRF
The amplifier described, uses four low cost Power Fets to generate 250W output on the European 136 kHz L.F. allocation. The circuit uses traditional RF construction techniques, and has 50 Ohm in- and output impedances.

Creation date : 07/08/2007 @ 21:49
Last update : 29/08/2018 @ 18:31
Category : 136 kHz Projects
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