MC145191F.  Red Part No RB15.   

Also known as Maxon Part No 2201313

Used in a high number of portable two way radios, Mobile Radios and Data radios as the PLL, Frequency Synthesiser IC,

This device is used extensively in many high power radio transmitters.
This is an original Part, manufactured by Motorola and used in many radios, but now obsolete and no longer manufactured.  Once our stock is run out we will not be able to source more.