NOAA APT Receiver

Currently I'm working on improving the reception of the antenna for the NOAA satellites in APT.
The range of the images is not big enough like expected.
The antenna is an home made Quadrifilar helicoidal: http://jcoppens.com/ant/qfh/index.en.php

An example of how is an image APT:
:
From left to right you see:

• Visible channel sync
• Visible channel telemetry
• Visible channel image
• Marker and space of visible channel
• Infrared channel sync
• Infrared channel telemetry
• Infrare channel image
• Marker and space of infrared channel

Channel sync:
Channel A: series of  square waves at 832 Hz, 7 cicles

Oscilloscope	Spectrum

Channel A: series of  square waves at 1040 Hz, 7 cicles

Oscilloscope	Spectrum