This page is idented to collect technical info regarding the communication package.
General Decisions
Decision QRGs: TX 70cm, RX 70cm and 2 m (otherwise 3rd harmonic of 2m will degrade 70cm reception)
Preliminary frequency payload: beacon: 70cm, rxtx modem 70cm, control unit 2m rx and possible 10m rx
Section HF
MiniCircuits LFCN-530 LowPass Filter, ceramics, DC to 530 Mhz (suitable to seperate bands) Datasheet Weblist with all filters
RF2117 High Efficieny Power Amplifier (70cm operation, controlable, up to 2 watts at 3V) Datasheet
RF5110G (Replacement for RF2117) (wider operation, more watts at 3V ) Datasheet
M/A-COM SW-425 HF Switch (DC to 3 Ghz, 3 Watts) Datasheet
Section Modem and Simple Receiver
Motorola MC3362 Low-Power Narrowband FM Receiver (suitable for 2m reception) Datasheet
Blockschematics for pic based afsk25 rxtx Link to pdf
Section Tranceiver
CC1020 Low-Power Single Chip RF Transceiver for Narrowband Systems (suitable for 12,5 and 25 kHz operation) Datasheet
AXSEM AX5043 SingleChip Lowpower Tranceiver (the swiss rxtx knife, operates from 2m up to 23cm Article about in german Link to Datasheet
Similar Projects
Development of a Highly Integrated Communication System for use in Low Power Space Applications (Thesis Huerta, 2006) Link to Document
Forum for CubeSat Techs Link to Forum-Transceiver-Antennas
Online Documentation of the Robusta Satellite, build by the University of Montpellier Wealth of tech docs and prints
Techinfo of ballooning projects of ÖWF/Polares Link to Documents, Thanks Michael
Requirements for ballooning practically ÖWF Experiances
PIC Based PSK31 encoder Link to Projectpage
Protocol
List of Satellite Starts so far (hall of fame) Link to the list
A survey of CubeSat Communication Systems (Do's and Dont's, KF6ZEO and KI6GIV) Link to Document
Misc
Usb sized SDR RX from 60MHz to 2200 Mhz, costs about €160 Project page
Shop for CubeSat Components (mur.sat wont fit into the clumbsy dice 
) Link to Shop
List of high altitude operating gps modules Link to List