Critical RF Direct - Where Enterprise and Government Find the Best Service & Lowest Prices on Critical RF Systems and Software

Looking to connect up to an unlimited number of 2-way radio systems together over an an unlimited distance?


Want to instantly talk & listen to employees and users of commercial, public safety, and other radio types of 2-way radio system(s) from your BlackBerry, iPhone, or other Smartphones, PC's and Mac's?


Need to make all radio systems in your city, county, state, or nation interoperable with one another on a budget?  Tired of being told you need to replace or upgrade all of the radio equipment?


Have a desire to shed costly monthly backhaul overhead incurred while running a wide area mobile wireless system such as cellular, SMR, LMR? Need to find and take an elegant approach to packet switched backhaul migration to eliminate ongoing costs?


When planning, designing, and implementing Critical RF Direct engineers can help save you time and money!

About Us

Critical RF Direct was founded in October 2009 by Critical RF, Inc. Founder Steve Calabrese (callsign: KJ4MDZ).


Steve and his friends Alex Norwood and Dr. Sam Gray unexpectedly ignited the PTToIP revolution in 2001 at Clemson University by designing and pioneering the Critical RF software and hardware suite, the first ever working commercial PTToIP and RoIP platform that allowed people and companies with mobile devices, computers, and 2 way radios to instantly talk worldwide.


Our references are from vast in both geography and project scope, and available to you upon request. is committed to the very best in customer service - the founder's touch.


We look forward to helping you design the most efficient and cost effective system for your needs.


Critical RF Direct offers immediate system design assistance as well as the lowest prices on Critical RF RoIP system linking, mobile backhaul, softradios, and interoperability products.


Here you will find the entire Critical RF suite of hardware and software as well as information on how to demo and purchase.