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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Linear amplifiers , MSK, and 500kHz |
| From: | [email protected] |
| Date: | Tue, 23 Nov 2004 12:21:58 EST |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
|
Greetings all, I tried writing an MSK decoder, re-using parts of the PSK31/PSK08 decoder, but like Bill didn't get it working properly. Furthermore, at that time I was happy with the performance of PSK08 (and even PSK02) as implemented in Spectrum Lab - most of all because the maximum output power of my "almost-linear" PA was limited to 80 Watts so efficiency was not an issue (but this may change soon...). To anyone trying an implementation of an MSK decoder: Forget the simple approaches using Squaring- and Costas Loops - it takes more than this. Producing an MSK signal, on the other hand, is simple if you treat it as frequency shift keying with a modulation index of 0.5 . The bandwidth efficiency (if we had an optimum decoder) would be 1.9 (bit/sec per Hertz), almost the same as for QPSK. But, as so often, real-world problems seem to have prevented MSK being used as narrow-band amateur radio mode. Best regards, Wolf DL4YHF. |
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