From SEDSWiki

Re-estimated subsystem costs

• VX-3R: $205
• MCU
  • 16F877: $10
  • Misc parts (resistors, capacitors etc...): $50
• TNC (misc components, resistors and capacitors): $50
• PCB: $90
• prototyping parts (breadboard etc...): $40

Estimated energy per orbit

Assuming a Yaesu VX-3R.

• Transceiver
  • Receive: 60mA @ 3.7V, 90 minute orbit, so E = IVt = 60e-3 * 3.7 * 90 * 60 = 1198.8 J/orbit
  • Transmit: 1.2A @ 3.7V, 10 minute transmit, so E = IVt = 1.2 * 3.7 * 10 * 60 = 2664.5 J/orbit
• MCU: 10mA @ 3.3V, 90 minute orbit, so E = IVt = 10e-3 * 3.3 * 90 * 60 = 178.2 J/orbit
• TNC: 10mA @ 3.3V, 90 minute orbit, so E = IVt = 10e-3 * 3.3 * 90 * 60 = 178.2 J/orbit

On the Power wiki page, they say that they'll have 8183.5 J/orbit available and we're using 4219.7 J of that, or 52% of the total. This sounds reasonable to me - the transmitter is expected to be one of the highest power devices on the satellite. We need to check with Power (and the other teams) that this is OK.