Picking up from where we left off last time, with transmitter batteries, here are some more results from timed discharge tests with transmitters. The Spektrum DX7, as already noted, gave a running time from charge to battery warning of 9 hours. A similar check on a JR DSX9 gave an equal result, both transmitters being powered by a 1500 mAh NiMH pack. Further testing on a JR PCM10SX showed that 2.4 GHz transmission is inherently easy in its power demands. Using the same battery pack again the PCM 10 ran for just under 4 hours with a 35 MHz module fitted. When this was changed for a 2.4 GHz module, and the battery recharged, it ran for just over 7 hours. To emphasise this point, the new Spektrum DS6i transmitter runs happily on a four-cell pack. Bear in mind that these figures apply only to the tested transmitters. They may be typical, but each one is individual and its battery performance will depend on the individual battery. Knowing the performance that a pack will give can be very useful. The voltage of a partially charged battery will show on the display of a transmitter. Taken together with the discharge performance, a discharge table for a transmitter can usefully predict the remaining transmission time. For large capacity NiMH packs this can give some of the presumed benefits of LiPo power.
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