Radio Builders

Radio Discussion => Technical Corner => Topic started by: RIGMO on November 18, 2025, 09:12:56 pm

Title: Re: MC145151P2 Low Phase Noise
Post by: Albert H on February 02, 2026, 12:16:59 am

The "Smartkit" circuit works well enough.  It takes a few seconds to lock, but you're not going to be changing frequency all the time!  The version of that circuit that we used to use had differing filter resistors, switched in by a 4066.  This would allow lock in about 4 seconds, then would slow the filter down by 12 times to allow really low bass through, and prevent bass tilt.It added to the circuit complexity but avoided the normal compromise between lock-up time and bass response.

Title: MC145151P2 Low Phase Noise
Post by: RIGMO on November 18, 2025, 09:12:56 pm

HI
Question for all sopecialy for Alber H

How To achive speed and stability
do anyone heave good solution with outpus φR, φV Phase Detector B Outputs (Pins 8, 9)
Thank you in advance