QRM SAMPLES

1. Recorded on HF (AM) the signal below is believed to be from a neighbours gas central heating system. When present the signal covers the HF spectrum spaced by 16Khz. The break at 45 seconds is just to shorten the recording. The single click at the beginning and end of the recording are part of the interfering signal.

 

2. Recorded on VHF (AM) the signal below at S9+10 is thought to be a type of HPA type power line network adapter. When present the signal is continuous across the spectrum from Top band to 70cm. On the day of recording, the problem was noted from the time I switched on until 09:59, from 14:25 until 14:53, 17:20 until 17:42, 19:56 until 20:25 etc.

 

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