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You may look this project. It has two inputs. First is for frequencies up to 62 MHz and second up to prescaler frequency limit. It can be even 3.5GHz.
I realized it and find OK. Prescaler can be any type with required divide ratio and high enough upper frequency limit.
I MADE A CMOS CASCADE CMOS DRIVEN MATRIX LED DISPLAY
IT USED 1MHZ REFRESH OF THE LED MATRIX MUX SO THE LED UPDATES AS PER YOUR DIVISION EXACTLY {LOTS OF LEDS DONT SO GIVES A FALSE ILLUSION SLURRING YOUR MEMORY OF THE EVENT AS YOU TUNE} WAVES IN THE BRAIN
ALPHA BETA GAMA DALTA EPSILON -1KHZ - 1 MHZ RESPONSE LEVELISED
LOTS OF ENGINEER COMPLAIN
BEST "REFRESH" TYPE COUNTER I FOUND WAS A NIXIE TUBE FOR NON MEMORY SLUR WHILE TOO TUNE SO I DESIGN MY OWN}
THIS STOPS SLOW FLICKER AND REFRESH PROBLEMS
TAKING THE TOTAL COUNT DOWN TOO A BINARY ROW PIN CARD TYPE MATHS REPRESENTATION OF THE FREQ
INSTEAD OF USING CONVENTIONAL GATE AND COUNT
I USE SAMPLE AND HOLD
THE HOLD WAS HELD AND THE HELD SAMPLE WAS REFRESHED @ 8 MHZ THE ROWS WERE REFRESHED LIKE A PIN BOARD OF THE RT SAMPLE IN DATA TERMS - SOME FREQ
I DEDUCTED WITH A DIGIMETRIC PRESCALLER
I THINK WAS AN AD SOMETHING CHIP ILL LOOK OUT THE SCHEMO
GATE AND COUNT BY CASCADE IS STUPIDO
SAMPLE THE GATED HELD IS LIKE PI METAL DETECTOR TECHNIQUE
AND IS FASTER LATENCY IN RT THAN MOST PLL'S LOCK
ONE THING I LEARNED IS THIS
IF GRAVITY EXISTS AND IT DOES
IT GOES UP AS WELL AS DOWN MUCH LIKE COLUSIVE LAW
OF MOTION OF A BODY IN AN ATMOSPHERE
SO....... THE BODY OF RADIO THESE DAYS PREFERS TOO USE THE IMAGE OF THE FREQ AND THEN DOWN CONVERT {DOUBLE HETRODYNE}
SO WHY STICK A FREQ COUNTER AS A SINGLE HETRODYNE DEVICE
u can use a simple timer counter in ucontroller, 8051 pic avr, then use the prescaler ic to increase the freq. range but it will decrease the resolution.
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