| Stacja AM w pasmie 7 mhz. |
| Z dokumentu https://www.iaru-r1.org/index.php/downloads/Documents/HF/IARU-Region-1-HF-bandplan-Article--17June2016_english/ : IARU Region 1 HF bandplan – how to interpret? Ulrich Mueller, DK4VW, Chairman IARU Region 1 HF Committee C4 .... Segments with 2700 Hz maximum bandwidth: All modes with up to 2700 Hz bandwidth may be used, such a maximum bandwidth is needed for SSB or digital modes transmitting text, image or voice. The bandwidth of a normal SSB filter has set this upper limit of 2700 Hz. Such a limitation should allow usage of the band by as many stations as possible with an equal fraction of a band, independent of mode. In the past we had no limitation of bandwidth indicated in the bandplan, but the introduction of such limitation is justified by the increasing number of radio amateurs during the past decades. .... Segments with 6000 Hz maximum bandwidth: Modes with up to 6000 Hz may be used on frequencies above 29000 kHz, since the 10m band is wide. In practice such a bandwidth is used mainly for FM transmissions with a very low modulation index. .... Amplitude Modulation This mode with a bandwidth exceeding 2700 Hz is occasionally used for historical reasons. A footnote to the bandplan is trying to cope with such requirement: Amplitude modulation (AM) may be used in the telephony sub-bands provided consideration is given to adjacent channel users. It was agreed by the conference that a special segment for AM is not useful, it would encourage AM which is not intended. IARU Bandplan https://www.iaru-r1.org/images/IARU_REGION_1_HF_BAND_PLAN__2016_v2.pdf Ktoś może powie że ma gdzieś PZK, IARU i bandplany - ja tak nie powiem. |