The Clock Generator provides a series of synchronized clock signals required for the clocking functions of the digital communications system. The module consists of a master clock driving a 10^n-frequency divider, which in turn drives eight divide-by-two cascade-connected frequency dividers. Access to the output signals of each section is achieved through BNC connectors. In addition, a multi-pin connector provides the output signals from each of the divide-by-two frequency dividers. All frequency divider output signals have a 50% duty cycle.

One of the following four master clocks can be selected through push buttons:

variable frequency clock (1-10 MHz)
crystal-controlled fixed-frequency clock (10 MHz)
external clock
manual clock (activated through a push-button switch)

The frequency-division ratio of the 10^n-frequency divider is determined using a push button that selects an integer power n from 0 to 7. An LED display indicates the chosen frequency-division ratio.

The Clock Generator can be stacked on top of the Power Supply / Dual Audio Amplifier, Model 9401, the Enclosure / Supply Regulator, Model 9420, the FSK Modem, Model 9449, or on top of any module of the Analog Communications Training System. Power is distributed through the self-aligning multi-pin connectors located on the top and bottom of the modules.

Specifications
Power Requirements: Connection to the Power Supply / Dual Audio Amplifier, Model 9401 (not included)

External Clock Input: Maximal Frequency 10 MHz

Clock Outputs

• A (Master Clock)
  • Complement of A
• B (Master Clock/[10^n]) (n=0 to 7, switch selectable)
  • Complement of B
• B/[2^n] (n=1 to 8)
  • Composite Clock (all eight B/[2^n] clock outputs on D-connector)

Output Impedance: 50 Ω (all BNC outputs)

Physical Characteristics
Dimensions (H x W x D) 112 x 330 x 300 mm (4.4 x 13.0 x 11.8 in)
3.3 kg (7.3 lb) 3.3 kg (7.3 lb)