[teleforce]

Wonderful article and I don't even know that this device existed perhaps due to Agilent/Keysight bias laboratory/shop.

R & S AMIQ Modulation Generator general specs is available here [1].

Fun facts, the venerable Silicon Valley was started by Hewlett-Packard (HP, then Agilent, now Keysight) that mainly supplying function/signal/waveform generator for the then booming radar and electronics industry.

HP Garage is now a designated landmark and marked with a plaque calling it the "Birthplace of 'Silicon Valley' " [2].

[1] Rohde & Schwarz – AMIQ04 I/Q Modulation Generator:

https://testworld.com/product/rohde-schwarz-amiq04-iq-modula...

[2] Hewlett-Packard:

https://en.wikipedia.org/wiki/Hewlett-Packard

[CamperBob2]

Their first customer was actually Disney, who needed a wide-range audio oscillator to test sound hardware that would be used in theaters showing 'Fantasia.'

The oscillator's model number was 200A, because even back then they understood the SV maxim "Nobody wants to buy the first version of anything."