Belcher, R. et al. (1989). Newnes Mobile Radio Servicing Handbook. Butterworth-Heinemann, Oxford.
Bird Electronic Corp., Catalog GC-92.
Farnell Instruments Ltd, Catalogue, 1993.
Marconi Instruments Ltd, Test and Measurement Instrument Systems 1993/94.
RTT Systems Ltd, Catalogue, 1993.
Winder, S.W. (2001). Newnes Telecommunications Pocket Book. ButterworthHeinemann, Oxford.