Originally Posted by howardcano

You'll still need amplification and a comparator with some hysteresis to create the digital input levels necessary for the phase detector. The tank circuit formed by the timing loop and its parallel capacitance filters at 5 MHz, so it would be best to not use the 470R resistor and balun transformer. It might be possible to use more filtering, but if you use too much then the system won't follow the modulation very well. It's certainly worth trying if there are noise problems.