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Activities around ham-radio equipment ...

Here a short introduction of the HF amplifier projects. All parts self made from boards up to chassis.

Split filter board  for 5 pole Chebyshev filter. Each board contains filter for two bands.

Here one layer in acid bath..

Test circuit 80, 160 meter

simple switching power supply 100V_/16A for the first project with DL9AH amplifier

2x16 IRF-710 mosfet

Boxed German legal limit amplifier and filter ...

The split-filter worked over many years in combination with the amplifier without any failure. So the next project can come..


The oversized design and SDS-Relais for the new DICA project are providing high power potential.

The main unit contains now 8KV capacities; double core design for low pass sector. Silver dipped micas for high pass sector.

3 boards cover the 6 main bands (160 Meter - 10 Meter). Also prepared for automatic band switch and 4 port antenna selection.

Concept with MRF-150 has been overtaken but works also in actual commercial devices. 


Two tone test with 700Hz/1900Hz and 6W input power gives  800 W output  into Dumyload;  ~  -35 dBc:

Same input signal with Pure Signal and Auto-Attenuate switched on  gives 780 W output but better IMD; ~ -50 dBc:



After 2 years under construction final boxing of all with the trivial rest... 


Enough from poorly technical photos ? Feel free to visit my wife´s page :

photography gallery













7311047 Last modified: 2016-05-13 20:34:44, 3387 bytes

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