GENERAL TECHNICAL DESCRIPTION
The PRO 4 mini consists of two sub-systems; the housing which contains the gel-cell power supply and the
modules, and the CDM4 RF/power distribution module.
The housing is built of machined aluminum and covered with a vinyl carrying case. The handle is bolted directly to
the top aluminum panel of the case for security. The 6V, 4.8 Ah Panasonic LCR-456-P lead-acid gel-cell batteries
are connected in series to provide 12 Vdc power to all the modules installed into the system. These batteries were
selected for their recharge characteristics and reliability under extreme conditions.
The CDM4 RF/power distribution module is the heart of the PRO 4 mini system. Helical resonators in the front end
of the RF section attenuate out-of-band RF signals preventing intermodulation and front end overload. Following
the resonators is a low noise, low gain RF amplifier designed to evenly compensate for splitter losses in the stage
that follows. A precision splitter/isolator divides the RF signal into four isolated signals preventing spurious RF
coupling between receivers. The splitter/isolator is termination independent which prevents mismatched or
disconnected RF outputs from affecting the other receivers.
Power can be supplied to the CDM4 module from four possible sources. The primary source is the gel-cell battery
pack built into the bottom of the housing. Power may also be provided through an external DC power source of 12
to 20 Vdc of either polarity. When an external source is connected, an internal relay automatically disconnects the
internal battery pack. If that DC source fails or is disconnected, the system automatically reverts to the internal
batteries. AC power can be provided through the CH-50 charger included with the unit. While operating in the AC
mode, the internal batteries are also recharged. The individual receivers and the CDM4 module can also be
operated from internal 9V alkaline batteries housed inside each unit’s battery compartment. In this mode of
operation, all receivers and the CDM4 have to be manually switched for "internal" power. All power circuits are
protected by internal auto-reset fuses in the CDM4. Should the power to one receiver fail, the others will continue
to operate.
Figure 1 - PRO 4 mini Block Diagram
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(28 pages)
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