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| + | [* green] The bottom side has all the RF circuitry -- the chip is a Nintendo chip marked "WR-DOL / H2102 / CG2710 / 02", presumably the radio. |
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| + | [* orange] [http://www.epcos.com/web/generator/Web/Sections/Press/TradePress/PressReleases2003/SAWComponents/CordlessFunWithSAWFiltersPage,locale=en.html|EPCOS X6882] custom bandpass filter |
| + | [* blue] Trim-pot for adjustment at the factory -- could be a frequency tweak or gain adjustment. |
| + | [* violet] The rotary switch allows the user to choose a frequency to avoid interference with other devices. |
| + | [* red] The antenna is mounted directly on the PCB, inside the device. |
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