Citazione:
Originalmente inviato da Pepetone  domandina tecnica .....
la DX8 continua a funzionare secondo il criterio delle 2 portanti a 2,4 Ghz ??
se si.... si prevede di passare ad altre soluzioni che utilizzino tutti e 80 canali della banda 2,4Ghz ?? |
Il protocollo DSM utilizza 40 canali, di cui due vengono utilizzati per la trasmissione. Gli altri 38 canali sono usati per la ricezione:
"Please note that transmitting on only two hopping channels is not a disadvantage to DSM. First, the RC has very low data rate that the two hopping channels can more than handle. Second, the two channels provide excellent frequency diversity. Limiting DSM to two channels also avoids polluting the 2.4GHz band unnecessarily and allows for the expansion to future features such as telemetry [...] Conformity tests at Elliott Laboratories, Inc. in Sunnyvale, California, USA confirmed that DSM utilizes 40 non-overlapping channels, well above the minimum requirement of 15. Further, the test confirmed that DSM has 2 MHz of separation between the channels, again well above the minimum requirement, and that the dwell time per channel is only 2 ms, well below the specified maximum of 400 ms."
N.B.:
"From a bandwidth perspective, though, Spektrums DSM technology was designed to meet all of the requirements of FHSS modulation as specified in EN 300-328 v.1.7.1 clause 4.2.1"
(Fonte: Horizon Hobby Inc.)
P.S.: Mella.it vende la DX8 a 339 euro.
