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HP 8657B Option 022
0.3 GMSK Modulator Unit
HP 8657B with Option 022 0.3 GMSK Modulator Unit
December 2015
HP Technical Data describes Option 022 "For European digital communications systems, generates 0.3 Gaussian Minimum Shift Keying (0.3 GMSK). 100kHz to 2060MHz AM & FM. 0.3 GMSK 520MHz to 2060MHz, 10MHz to 130MHz data inverted. Baseband I/Q outputs. With 0.3 GMSK modulation turned off, the Signal Generator performs as a standard 8657B".
The 8657B is modified to provide a 800MHz input and output to the separate 0.3 GMSK Modulator which is housed in a 1U high case underneath. Interconnections are provided by 2 SMA to 3.5mm cables. The 3U high 8657B is fixed to the Modulator with 4U high front panel handles and rack ears, plus special brackets at the rear.