Network Deployment Willtek's 8300 Griffin Fast Measurement Receiver is the ideal choice for quick and accurate performance of a wide range of measurement functions in the RF channel. Featuring the latest RF and logic technologies, the Griffin is the most effective measuring receiver available for planning and optimising cellular networks like TETRA, GSM-R or UMTS. Compliant measurements to the "Lee Criteria" for several channels can be performed while driving at 100 km/h.