Bilectron was a subcontractor to RDA Inc, on a  project to develop a breadboard / brassboard of a VHF modulator test unit for a DOD research and development program. The function and operation of this unit are proprietary, however the generic features of the unit can be described. The unit features are:

• A modular architecture in a stacked PC/104 form factor

• Heavy diecast Aluminum powdercoated chassis and anodized Aluminum sleeve, which is removable for test

• Internal UPS operation provided by internal SLA battery and integral charger unit

• Integration of PC/104 FPGA and OEM DDS boards with custom designed mixed signal and RF PC/104 boards

• 160 Msps capable 12 bit DAC board designed for low noise and spurious output

• All frequencies derived from a single low phase noise OCXO based clock generator

• Custom filters for baseband and RF, including a group delay compensated wideband filter achieving +/- 0.5 dB flatness over the band.

Pictures of the unit with and without the cover and lid on are at the following links:

                    Modulator Unit Right view

                    Modulator Unit front with boards exposed

                    Modulator Unit back with boards exposed

                    Modulator with inner lower board exposed

                    Close ups of PC/104 PCBS (DAC Output, Mixer Doubler, Output Amp)