Vega U2020 Application Guide
2
This guide provides information for configuring U2020 systems with various numbers of channels. Block diagrams
and basic equipment lists are provided for systems with from four to sixteen channels. Other useful application and
configuration information is also included.
Important Notes
1.
Each MC-2020 series multicoupler can power to up to four attached receivers through its BNC antenna cables.
The MC-2020 power supply has a capacity of 2.5 amperes, more than enough for four receivers and the
multicoupler itself. It is NOT necessary to use the wall-type power supplies for the receivers when they are
connected to the output of a MC-2020 multicoupler. This usually considerably simplifies the installation of a
U2020 system.
WARNING
Because dc power is present at the output connectors of the MC-2020, unused outputs SHOULD NOT be
terminated with 50 ohms. For the same reason, MC-2020 series mulitcouplers SHOULD NOT be used with
receivers other than the R-2020. Serious damage to the receiver, and in some cases to the multicoupler, can
result.
2.
The original MC-2020 multicoupler covered the 746 -782 MHz frequency range used by the "A" and "B"
versions of the U2020 system. The newer MC-2020A multicoupler covers the full 672 to 782 MHz frequency
range, making it compatible with the newer "C", "D", "E" and "F" frequency ranges for the U2020, as well as
with the original "A" and "B" ranges. If a U2020 installation includes ANY systems in the newer "C", "D", "E"
and "F" frequency ranges, the MC-2020A multicoupler MUST be used, and not the original MC-2020.
3.
Early MC-2020 multicouplers used 2.5 mm power connectors, the same size as for the R-2020 receiver. In some
instances, users attempted to power MC-2020s and the attached R-2020s from one of the small wall-type power
supplies. This resulted in system failure and overheating of the power supply. Recently produced MC-2020s and
all MC-2020As use a 2.1 mm power connector, preventing this problem.
If a replacement power supply is required for a MC-2020; please specify the connector size when ordering. (If
the plug on a wall-type power supply fits the power connector on the MC-2020, a replacement with the 2.5 mm
connector is required. If it does not fit, a 2.1 mm power connector is needed.)
