Rockwell Automation COLLINS MP-20 User manual

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Introduction-----------------------------------------------------------------------------------------3
Radio Set Components----------------------------------------------------------------------------4
Operating Configurations andOptions--------------------------------------------------------9
Standard Two-Person Configuration----------------------------------------------------------9
Single Operator Configuration------------------------------------------------------------------9
Cold Weather Configuration-------------------------------------------------------------------10
Audio/Keying Option---------------------------------------------------------------------------- 10
Input Power Option------------------------------------------------------------------------------10
Antenna Options----------------------------------------------------------------------------------10
Preparation For Use------------------------------------------------------------------------------11
963A-1 Radio Set Harness---------------------------------------------------------------------- 11
719D-2A Receiver-Transmitter Group------------------------------------------------------ 13
Power Pack---------------------------------------------------------------------------------------- 14
Headset, Handset and Telegraph Key------------------------------------------------------- 14
938A-2 Antenna---------------------------------------------------------------------------------- 14
Antenna Counterpoise-------------------------------------------------------------------------- 15
938A-1 Antenna-Vertical Orientation------------------------------------------------------- 16
938A-1 Antenna-Horizontal Orientation--------------------------------------------------- 17
Operation----------------------------------------------------------------------------------------- 19
Preliminary Setup For Mobile Use----------------------------------------------------------19
Preliminary Setup For Stationary Use----------------------------------------------------- 20
886B-1 Generator Operations-------------------------------------------------------------- -20
Spare Battery Use------------------------------------------------------------------------------ 21
719D-2A Receiver-Transmitter Group Operating Controls---------------------------21
Frequency Display and Selectors---------------------------------------------------21
Mode Selector--------------------------------------------------------------------------21
Function Selector----------------------------------------------------------------------21
Gain Control---------------------------------------------------------------------------22
Panel Lighting-------------------------------------------------------------------------23
Operating Indicators------------------------------------------------------------------------- 23
Operating Time--------------------------------------------------------------------------------23
Warnings--------------------------------------------------------------------------------------- 23
Voice Communication----------------------------------------------------------------------- 24
CW Communication------------------------------------------------------------------------- 24
Data Communication------------------------------------------------------------------------ 24
Operation Maintenance---------------------------------------------------------------------25
Clearing Tune-Incomplete Condition---------------------------------------------------25
Reenergizing The 612A-1 Battery--------------------------------------------------------25

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Introduction
The MP-20 Radio Set (figure 1 is a lightweight HF portable receiver – transmitter
which offer many desirable features.
Figure 1. MP-20 Radio Set.
■20 watts of RF power output (pep or average)
■280,000 communications channels in the 2- to 30-MHz band at 100-Hz increments
■SSB and AM operation
■Voice, CW and data modulation
■Rugged construction
■Much smaller size and lighter weight then older systems
■Fully waterproof
■Low power consumption
■An integrated, automatic antenna tuner with constant VSWR surveillance for
greater efficiency.

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MP-20 radio set components
The MP-20 Radio Set, shown in figure 2, consists of the 719D-2A Receiver
Transmitter Group, 612A-1 Battery, 963A-l Radio Set Harness, H-189/GR Handset,
and 938A-2 Antenna.
Figure 2. MP-20 Radio Set Components

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7191D-2A receiver-transmitter group
A compact lightweight receiver - transmitter consisting of three units: 377L-2
Receiver – Transmitter Control, 671V-2 Receiver – Transmitter, and a 549A-2
Amplifier-Coupler. When mechanically latched together, these units are electrically
connected through mating connectors. All operating controls for the receiver-
transmitter are located beneath a hinged cover on the 377L-2.
612A-1 battery
A Nickel cadmium, 1.8 Ah, battery that latches beneath the 719D-2A Transmitter –
Receiver Group. It supplies DC power to the receiver – transmitter for 12 hours of
operation at a 1:9 transmits voice/receive duty cycle.
963A-1 radio set harness
A Lightweight, rugged pack frame with adjustable straps. It can hold,
simultaneously, a 719D-1A Receiver-Transmitter Group, 612A-1 Battery, and either
an 886B-I Generator or a spare 612A-1 Battery. The field pack attaches to the rear
of the pack frame, and has compartments to store all the accessory components
except the 412Y-2 Battery Charger.
H-189/GR handset.
A Handset with an earpiece, microphone, and push-to-talk (ptt) switch in one
assembly. It is connected to the receiver-transmitter through a coiled cord and plug.
938A-2 antenna
A 2.4 meters (8-foot) whip antenna that can be easily folded for storage. It has a
shock absorbing mount and detent positioning device capable of ±90" front-to-back
movement in 45o increments.
MP-20 accessory components
Accessory components, shown in figure 3. that may be used with the MP-20 include
headset, telegraph key, 540L-1 Battery Cable, 938A-1 Antenna, antenna
counterpoise, 540K-1 Control Extender, 412Y-2 Battery Charger, 886B-1
Generator, and nonrechargeable battery.

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Figure 3. Accessories Components (Sheet 1).

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Headset
A headset consisting of two earpieces, a boom microphone, a push to talk (ptt)
switch, a headband, and a coiled cord and plug.
Telegraph key
The telegraph key is adjustable in tension and gap, and has a 0.9-metre (3-foot)
flexible cord and plug. The key can be attached to the operator's thigh with a strap.
540L-1 battery cable
A 1.5-metre (5-foot) cable and a canvas bag, with an adjustable shoulder strap, that
allows the 612A-1 Battery to be carried under the operator’s outer clothing during
very cold weather.
938A-1 antenna
A dipole antenna that consists of two 35.67-metre (117-foot) braided wires wrapped
on individual plastic bobbins, that allow long-range communication. Each wire has
a 15.25-metre (50-foot) throwing line attached. The two wires are connected to a
center junction, which is connected to the receiver - transmitter with a 15.25-metre
(50-foot) antenna feeder cable.
Antenna counterpoise
Four 10-metre (32.8-foot) braided wires, wrapped on a plastic bobbin, are used to
provide a ground plane in low electrical conductivity areas. The four wires are
connected together at a center junction, which is connected to the receiver-
transmitter with a 1.8-metre (6-foot) cable.
510K-1 control extender
A 2-piece unit that allows the 377L-2 Receiver-Transmitter Control to be extended
for one-man operation of the receiver-transmitter while it is mounted on the
operator's back. The 377L-2 plugs into the part that clips onto the operator's belt.
The other part, connected through a cable, secures to the 671V-2 Receiver-
Transmitter.

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Figure 3. Accessories (Sheet 2).

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412Y-2 battery charger
A portable battery charger, with a cover, that allows up to six 612A-1 Batteries to be
charged or discharged simultaneously. It operates with either +28 volts dc power or
110 volts ac power. A simple internal wiring change permits Operation on 220-V ac
power.
886B-1 generator
A hand-operated generator that can be latched between the receiver-transmitter
and the battery to extend the operating time indefinitely. The charging current is
about 125 mA at cranking speeds that can be maintained by the operator for 15
minutes.
Nonrechargeable battery
The nonreehargeable battery is a dry expendable battery that can directly replace
the 612A-1 Battery.
Operating configurations and options
The accessory components may be used with the 719D-2A Receiver-Transmitter
Group to produce operating configurations for various missions. Options that must
be considered in selecting the proper configuration include: type of input power,
mission duration, transmission range, stationary or mobile use, one or two man
operation and weather conditions.
Standard two-person configuration
The standard configuration consists of the 719D-2A Receiver-Transmitter Group
and 612A-1 Battery installed in the 963A-l Radio Set Harness. The 938A-2 Antenna
is connected to the antenna connector and the H-189/GR Handset is connected to an
audio connector. This configuration may be used during mobile missions of up to 12
hours operating time and distances up to 25 kilometers (15.5 miles). Normally, two
persons are required; one to carry the unit, the other to operate the controls from
the rear.
Single operator configuration
The 377L-2 Receiver-Transmitter Control can he clipped onto the operator's belt
using the 540K-1 Control Extender. This makes it possible for one person to operate
the 719D-2A Receiver-Transmitter Group while carrying it.

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Cold weather configuration
During very cold weather, the 612A-1 Battery must be kept warm to obtain
sufficient mission time. The 540L-1 Battery Cable allows the 612A-1 Battery to be
removed from the 963A-1 Radio Set Harness and to be carried in a battery bag
under the operator's outer clothing.
Audio/keying option
The 719D-2A Receiver-Transmitter Group can be keyed by the H-189/GR Handset,
the headset, the telegraph key, or by a modem. All connections are made to one of
the two audio connectors on the 377L-2 Receiver-Transmitter Control.
Input power option
The 963A-1 Radio Set Harness is made to accept a second 612A-1 Battery, which is
latched beneath the operating 612A-l Battery. When the operating G12A-1 Battery
becomes discharged, it can be interchanged with the spare 612A-l Battery to provide
a total of 24 hours of operation.
For cases of isolated or extended missions, when recharged 612A-1 Batteries are not
available, the 886B-1 Generator is used to replenish the battery charge. It may be
used either when the 719D-2A Receiver-Transmitter Group is not being used or
when it is in operation. The 886B-1 Generator connects directly between the 719D-
2A Receiver-Transmitter Group and 612A-1 Battery on the 963A-l Radio Set
Harness, without the need for additional cables.
Antenna option
In dry or rocky terrain of low electrical conductivity, a counterpoise Is provided for
use with the whip antenna. The simple 4-wire counterpoise is laid out on the ground
and its center connected to the shell of the BNC connector on the 719D-2A Receiver-
Transmitter Group.
To accomplish extended range communications, a simple portable 93SA-1 Antenna
(dipole) is provided for use in place of the 2.4-metre (8-foot) whip antenna. Each leg
of the dipole has a nylon throw line for stringing the dipole between convenient trees
or other structures. The center of the dipole has a coaxial feed cable, which is
connected to the BNC connector on the 719D-2A Receiver-Transmitter Group. The
dipole may be erected either vertically or horizontally; horizontal erection
providing, the greater range.
A 637K-1 Antenna can be used with the 719D-2A Receiver-Transmitter Group. This
high-angle radiation antenna requires a base adapter.