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AKD Target Hf3 Communications Reciever Instructions Manual

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    Page 1 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,...
    Page 2 2nd Steps Although the receiver was able to decode robust mode signals at this point, the amplitude response was very poor. Working through the stages: the first IF filter (which was originally a 2pole filter) I had replaced by a 4 pole 45 MHz monolithic crystal filter, type 45G15B1. These did not match in well with the existing circuitry, and were giving an 8dB p/p ripple across the wanted frequency range. Adding additional buffer stages to provide the specified terminating impedances...
    Page 3 This gave an overall response RF in to 455kHz out at the input of the 12kHz converter board of: The response is significantly improved, but still shows some ripple and falls off a bit steeply at the high frequency end. With a bit of adjustment to the three 455kHz IF coils, the final response below was achieved: Response 10dB/div Response 2dB/div Centre 455kHz, 5kHz/div 3rd Steps With the receiver amplitude response virtually flat across the required +/- 5kHz...
    Page 4 HF3 1st LO phase noise HP synthesizer phase noise
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