This program activates the MAX2837 transceiver to transmit an unmodulated
carrier.

Required Lemondrop -> Jellybean connections:

SCK:      Lemondrop P3 pin 2 -> Jellybean P9 2
CS_XCVR:  Lemondrop P3 pin 3 -> Jellybean P9 3
MOSI:     Lemondrop P3 pin 4 -> Jellybean P9 4
CS_AD:    Lemondrop P3 pin 5 -> Jellybean P9 5
MISO:     Lemondrop P3 pin 6 -> Jellybean P9 6
ENABLE:   Lemondrop P6 pin 12 -> Jellybean P7 pin 12
RXENABLE: Lemondrop P6 pin 13 -> Jellybean P7 pin 13
TXENABLE: Lemondrop P6 pin 15 -> Jellybean P7 pin 15
SCL:      Lemondrop P7 pin 3 -> Jellybean P6 pin 3
SDA:      Lemondrop P7 pin 5 -> Jellybean P6 pin 5
SDA:      Lemondrop P7 pin 6 -> Jellybean P6 pin 6
VCC:      Lemondrop P4 pin 2, 4, or 6 -> Jellybean P17 pin 2, 4, or 6
GND:      Lemondrop P5 -> Jellybean P13

For now we are running everything at 3.3 V, but in the future we may also
require:

1V8:      Lemondrop P11 pin 2, 4, or 6 -> Jellybean P16 pin 2, 4, or 6
