saa1057

can i use 4059 or SAA1057 as prescalers in this 50 mhz frequency meter to make it work in Ghz range...

http://ironbark.bendigo.latrobe.edu....wfm/newfm.html

because these chips have very low frequency response stated in their datasheets than is desired.

No chance. Look at datasheets for those two chips.

What VCO do you use for SAA1057?