====== Uplink ======
This is a proposal for a small uplink (ground to balloon) radio system:

===== Ground Station =====
  * 70cms (434MHz) Ham RADIO transmitter running 10W FM into
  * 10dbi yagi
  * PC
  * packet radio TNC - or soundcard software TNC (such as AGWPE or TrueTTY)








===== Balloon System =====
  * **Good quaility** 434MHz "licence exempt" type NBFM module
  * Single PIC chip decoder based on N0QBH "simpler" code - [[http://www.ringolake.com/pic_proj/zcd/zcdmodem.html|See Here]]

Although the N0QBH decoder does not use DSP techniques the expected preformance should be quite good given the channel is running over FM. 

Prototype system built on fibregalss matrixboard 60 x 26 x 12mm - weight 20g (including receiver module).

**Good quality:** Aim for sensitivity of -120dBm (0.22uV into 50ohm) for 12dB SINAD (signal + noise to noise ratio) and a 6db bandwidth selectivity of 10Khz (-/+5Khz).

{{communication:simpler.gif|}}