Contents
Reducing QTH/RX White Noise
The QRM Problem
How I hear radio white-noise
Our weekly open club net uses the repeater GB3CW. Sometimes, my home location (QTH) generates significant white noise, making listening to others’ transmissions on the net difficult (-to-impossible). Yet, my colleagues tell me that my transmissions are strong and audible (5/7 – 5/9).
My tinnitus and brain-foibles can make loud white noise intolerable, and the “ker-chunking” sound when someone releases their transmission key can be physically painful (as painful, perhaps, as when you stand next to an operating pneumatic drill – not kidding). Filtering out such noise using hardware such as the Wolfwave Audio Processor can sometimes be successful, but without the skills and knowledge behind sound, this can be time consuming and regularly unsatisfactory.
How do I quickly resolve QTH QRM?
The QRM Solution
| ☠️ | Update: since publishing this post, the Whiteley WebSDR Receiver (http://garths.zapto.org:8074/) has gone off-line. |
I now use a WebSDR in a kind of “split” operation.
Picking a WebSDR that’s close to the repeater during our weekly 2m Open Club Net, I can eliminate my QRH white noise by:
- Listening to the net using a WebSDR local to the net.
- Transmitting to the net using my transceiver.
I have to mute the WebSDR when I transmit (or else I hear my voice coming back at me echoing a fraction of a second behind – that kinda disturbing – hi hi!). This is a simple enough task using the WebSDR’s controls. Click – muted. Click again – audible.
Tip: For our 2m Open Club Net, I recommend the WebSDR located near Whiteley/Wickham – which has an ideal 2m receiver.
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