DSE PRS 500mW module 1 21.6Mhz IF to FM demodulator (out) 2 Transmitter modulator (in) 3 Clock (in) 4 Data (in) 5 Latch Enable (in) 6 Gnd 7 TX enable (active high) (in) 8 no connection 9 RX enable (active high) (in) 10 +ve power (probibly to RF power amp) 11 +ve power (probibly to PLL and something else) 12 no connection module will work at 5v. Square pin (pin farthest away from the aerial) is pin 1.