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| To: | [email protected] |
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| Subject: | LF: MF WSPR remote RX experiments |
| From: | DK7FC <[email protected]> |
| Date: | Fri, 30 Jan 2015 18:45:56 +0100 |
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Hello MF, I've continued with tests for my remote RX station.Right now i am running a Raspberry pi on a 7 Ah battery. It drives a WLAN stick and a simple USB sound card, feeding audio via a vorbis steam through the web. A MF receiver (LO = 461 kHz) is running on the same battery. The RX is connected to the same antenna where my MF/LF grabber is connected to. Ah and the Raspberry pi is powered by an external switch mode regulator, 12V=>5V! All in all this consumes about 250 mA @ 12V. I am playing the vorbis audio stream (about 220 kbps) directly in SpecLab where i can see the full MF spectrum. SpecLab is running a 2.5 kHz wide band filter and frequency converter feeding a virtual audio cable. Finally this is connected to WSPR-X... Now i can compare the SNR difference on both, the grabber RX and the remote-RX plus web data stream. The receivers are technically nearly identical as well as the filter settings. There is some time delay but it is not problematic, no correction needed for WSPR. I'm getting quite good results from the first attempt, a SNR difference less than +- 1 dB. The remote system is not running in the garden now, just a local test. WSPR reports on MF via web streaming are coming in at DK7FC/RPI. The test is running for a few hours now :-) 73, Stefan/DK7FC |
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