G8JNJ

To be honest, I'm not surprised.

Many European based short wave broadcasters in the 31m / 9MHz band are massive signals during early evening / night time here in the UK, and we are not even in the target service area.

I have to reduce their level by 20dB using an external notch filter, otherwise the KiWi complains quite badly.

The Voice or Turkey on 9460kHz is particularly problematic, as it targets Europe.

If you want a further challenge, try using the HFDL extension on different frequencies, to receive aircraft and ground stations, these will give you a better idea of what your Kiwi and loop are actually capable of.

Regards,

Martin

It looks like a modulation sideband from the Radio China broadcast station, I'd guess it was similar on the others sideband too. The music played on Radio China, tends to include a lot of flute type instruments, which produce extended sidebands with regular harmonic patterns that can resemble data type signals on the waterfall.

There are also Chinese jamming signals that attempt to make the Voice of Hope unusable, that also sound a bit like data, but I don't think that is what you have received in this instance.

I don't think this forum allows the attachment of audio recordings, so you maybe better off asking questions like this on the UDXF IO forum.

Regards,

Martin

Military STANAG 4285 most likely from Australia

Regards,

Martin

You will have difficulty decoding anything from that signal, it is US Navy, 850Hz shift 50bd KW-46 Encrypted, Lualualei, Hawaii.

Try using some of the KiWi's preset stations in the FSK extension, to get a better "feel" for the different shifts and baud rates.

The most common FSK signals tend to be Russian 200Hz (or near) shift "BEE" format.

https://www.sigidwiki.com/wiki/CIS-36-50

https://www.sigidwiki.com/wiki/CIS-50-50

Regards,

Martin

If you click on the column headers Internal / HF / External on the http://rx.linkfanel.net/ webpage, it will sort that column in descending order.

Personally, I like to sort by the HF value, as that is often a better indicator of actual performance.

However, the whole SNR measurement process can only really be used as a rough guide, and unfortunately the majority of KiWi installations are badly let down by poor antennas, often in very noisy urban locations.

The KiWi's in the top 10% (70 out of approx 700) SNR scores, are generally OK, but some of the rest are really awful, which is a great pity, and IMHO a great waste of resource.

Purchasing a receiver is only a very small part in the overall process of receiving signals. Although you can't really do without one, even a top of the range model, isn't going to make up for a poor antenna.

Signal to Noise Ratio is what matters, not absolute signal strength. Good transmit antennas don't always make good receive antennas, as they are required to do different things.

I'll keep on repeating this mantra until things improve, but I suspect I'll die first...

Regards,

Martin