All you have to do is build a quadrature sampling detector
Stan Horzepa: "[A] software defined radio (SDR) application for the Apple iPhone, iPod touch and iPad called iSDR. It is a portable software-defined radio receiver designed for experimenters, shortwave listeners and Amateur Radio operators -- and it is free! A caveat: receiving live on-the-air signals with iSDR requires purchasing or constructing a quadrature sampling detector (QSD) RF front-end device that connects between an antenna and the microphone input jack of the iPhone, iPod or iPad."
(ARRL/Kim Elliott)
Additional info: http://digitalconfections.com/index.php?option=com_content&view=article&id=46&Itemid=54
Stan Horzepa: "[A] software defined radio (SDR) application for the Apple iPhone, iPod touch and iPad called iSDR. It is a portable software-defined radio receiver designed for experimenters, shortwave listeners and Amateur Radio operators -- and it is free! A caveat: receiving live on-the-air signals with iSDR requires purchasing or constructing a quadrature sampling detector (QSD) RF front-end device that connects between an antenna and the microphone input jack of the iPhone, iPod or iPad."
(ARRL/Kim Elliott)
Additional info: http://digitalconfections.com/index.php?option=com_content&view=article&id=46&Itemid=54