10m QRM from zone 24

Sorry for not updating this page in some time - I have been busy now that I have returned to work.

I wanted to share what 10m sounds like in this part of the world. This QRM is present at all times when the band is open to zone 24. Presumably it is noise from inexpensive two-way radio devices in China and elsewhere in SE Asia. The noise is sometimes S9, and completely covers weak stations.

When the band is open to NA, we usually have no problems because BY is still in darkness and there is no propagation. Also, the noise is nulled when beaming NA. The problem is trying to work Europe. Anyone weaker than S-5 is completely inaudible. In the recording below, I first start by listening to HA1AG in QSO with a JA station. Zoli is a solid S9 here, but copy is difficult through the noise. I then tune up and down the band, before switching to CW. There are two instances where you can even hear Chinese language in either FM or AM - not sure.

This noise is getting worse, and has also spread to the 12m SSB band. It covers the entire band, from 28.0 to well above 29.0 Mhz.

QRM across the 10m band

The noise is actually visible on the band scope

The noise is actually visible on the band scope, only S3 but this is in CW mode.

The noise is a solid S-7 on the meter, peaking S-9

The noise is a solid S-7 on the meter, peaking S-9, while in SSB.

Start Slide Show with PicLens Lite PicLens

Posted under Amateur Radio, Uncategorized

This post was written by admin on March 14, 2014

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