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Wireless set No. 21 was developed for Infantry Brigade and Royal Artillery Regiment communication. The set was used as vehicle station, animal pack station, or ground station replacing Wireless Set no. 11 low power.
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| Freq. cov. |
4.2 to 7.5 MHz 19 to 31 MHz |
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| RX IF | 465 KHz | |||
| Range | 2 - 5 miles | |||
| RF Power | 0.8 / 1.5 W | |||
| PWR Supply | 6 V accumulator | |||
| Weight | 48.5 lbs without batt. | |||
| Size | 11x19 3/4x12.5 in | |||
| Tubes Rx | 3xAR8 - 6xARP12 | |||
| Tubes Tx | 2xATP7 | |||