PA0SIM´s home page

Welcome to PA0SIM´s home page

Dedicated to Ham Radio

My main interest is CW on short-wave, but thanks to the companies that don’t know how to design for EMC, my next interest is reducing QRM.

So you will find on these pages mainly my ideas, experiences and results on local and non-local QRM/noise reduction.

There are two routes, the Analog route and the Digital Signal Processing route (DSP route).

Audio samples can be found via the DSP route.

Some examples of what can be found on this site:

- small active receiving loops

- dual loop antenna system

- phaser / noise canceller

- effective directivity by DSP (phasing and muting)

- enhanced stereo reception by DSP

- SSB and CW Noise Reduction

- CW filter optimized for weak signal reception

- Two phase coherent Software Defined Radio’s (two Elecraft K2 receivers as SDR)

I don’t have a lot of acres for antennas. Having a small city lot and too many neighbours makes the chance of local QRM very real. Not all sources can be tackled and you have to live with these remaining sources.

You have neighbours and no local QRM? Then you are (still) very lucky.

And about PLC/PLT/BPL: use the HF-frequencies and support your club (and pray) !

View of my shack over 360°. Photographer: Wil Brugman.

Using Pixaround (PixScreen Lite) gives the best results.