If you look at the circuit, it looks like a front end of a broadcast band superhet receiver. It is a BC receiver (you know the type you find on small cassette radios). Suppose if you tune a Superhet receiver to listen 7.0 Mhz. The front end coil and C1A tunes on 7.0 Mhz. The Local Oscillator and C1B tunes on 455 Khz below 7.0 Mhz to produce IF signal 455 Khz. What we do, shift the Oscillator frequency closer to incoming frequency (about 1-2 Khz difference) to get AF.
The L1 is a short wave coil wound on a ferrite rod. T1 is short wave oscillator coil (green can). T2 is an audio driver transformer, not an IF transformer any more. Every thing else should be simple. From the transformer we use sutable audio amplifier to amplify the audio.