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SP5XMI pisze: Pozwolę sobie zacytować dokument na temat dopasowania stopnia mocy do anteny (Tank circuit and output coupling): "With fc equal to 25 percent above the operating frequency, the filter should attenuate the second harmonic of the operating frequency by about 35 dB and the third harmonic by about 55 dB." co z grubsza znaczy: Przy częstotliwości fc ustalonej na 25% ponad częstotliwość roboczą nadajnika, filtr powinien tłumić drugą harmoniczną o około 35dB, a trzecią harmoniczną o około 55dB. Cześć. Uzupełnię to (z "grubej rury"  ) fragmentem regulaminu radiokomunikacyjnegoRadio Regulations Appendices, APPENDIX 3 (REV.WRC-12) Maximum permitted power levels for unwanted emissions in the spurious domain, TABLE I (WRC-12) Attenuation values used to calculate maximum permitted spurious domain emission power levels for use with radio equipment Fragment tabeli: ________________________________________________________________________________________________________________________________________________________ Service category in accordance with |Attenuation (dB) below the power supplied to the antenna transmission line Article 1, or equipment type15 ________________________________________________________________________________________________________________________________________________________ All services except those services quoted below: |43 + 10 log (P), or 70 dBc, whichever is less stringent ________________________________________________________________________________________________________________________________________________________ Amateur services operating below 30 MHz (including |43 + 10 log (PEP), or 50 dB, whichever is less stringent those using SSB)16 ________________________________________________________________________________________________________________________________________________________ dBc: decibels relative to the unmodulated carrier power of the emission. In the cases which do not have a carrier, for example in some digital modulation schemes where the carrier is not accessible for measurement, the reference level equivalent to dBc is decibels relative to the mean power P. PEP: peak envelope power in watts supplied to the antenna transmission line, in accordance with No. 1.157. Pozdrawiam serdecznie |
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