The reason for the very low noise floor is mainly your antenna.
You are using more or less a very short length "Beverage" antenna. Google Beverage Antenna Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 12/28/2018 10:27 AM, Simon wrote:
This is an outdoor SOTA receive-only test to evaluate FT8 weak signal performance. Hope it is not too off topic for the list. My question is: Is this test location, -130dBm noise floor on 7074kHz, a good 'low NOISE and low interference area'? It is a 500 meter hill, protected by country park laws, prohibited residential building and no people live there. They also have airport long range radar and HF ship to shore receiving station in that area (on next nearby hill peaks). May be, the area is chosen as 'low noise area'? Test with SDRPlay RSP1A Thin Long wire, quarter wavelength at 7MHz, 40m band, just 1 meters above ground, for simple first test. Time 1040Z, 1840 local time. Just shortly after Sun set. Noise floor is -130dBm on SDRUno softwre. The strongest 7074MHz FT8 signal is -100dBm. I got 3 to 4 decodes per 15 seconds cycle. On WSJT-X Ver 2.0, SNR ranges from +4dB to -20dB, from station 4000km away from Hong Kong. Including Indonisia, Australia, New Zealand and Japan. I have near zero HF experience. Is this considered as 'very good' LOW noise area? 73 Simon _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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