Front end receiver modification for DRM: AKD Target Communications receiver. Model HF3. 
  
 
Summary. The receiver was modified and capable of receiving DRM, but performance was limited by 
the phase noise from the 1st
 Local Oscillator (LO).  
With the receiver on test, fed with a signal direct from a DRM modulator, the phase noise from the 1st
 
LO limited the SNR as reported by the receiver software to 21dB. If the 1st
 LO was replaced with the 
output from a Hewlett Packard frequency synthesiser,...