TMA2Q/LPC2Q Quadrature Tower Mounted Amplifier Instruction Manual
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Caution
: Observe anti-static discharge practices at all times.
The TMA2Q assembly should be located as close as possible to the antenna system. It may be desirable to install
a Sun shade to reduce TMA2Q internal temperature variations in hot and sunny climates.
The TMA2Q enclosure has built-in mounting brackets with dimensions shown in figure 4. The brackets are
typically fastened to two channel struts, which in-turn are fastened to a mast or tower leg. All fasteners and
mounting hardware exposed to the weather must be suitable for the environment; generally galvanized steel or
stainless steel materials are used.
The TMA2Q has provisions for bonding the metallic components and internal lightning arrestors to an earth
electrode system (terminal is marked EARTH). The grounding/bonding stud is stainless steel, 10-32, and will
accept a copper terminal lug. The bond to the tower should be No. 6 AWG copper and be as short and straight
as possible and be installed according to local practice.
Mount the TMA2Q with the RF connectors and weep-hole oriented downward. All RF connectors on the outside
of the enclosure are female type N connectors, and the corresponding coaxial cables must have male Type N
connectors. Type N connectors should be made up finger-tight; never use a wrench or pliers on the type N
connectors.
The TMA2Q is equipped with two LNA modules and requires two independent RF transmission circuits, one
labeled “CCW” and the other labeled “CW” (figure 5). Connections
always are made to both circuits. It is suggested that before the
coaxial cables are installed they be marked with colored tape or
colored heat-shrink tubing. This will help reduce the possibility of
incorrect connections to the circuits during and after initial
installation. On the system drawings, circuit “CCW” is color coded red
and circuit “CW” is color coded green.
Figure 4 (left) ~ Tower Mounted Amplifier mounting dimensions in inches
D.
LPC2Q LNA Power Coupler Installation
Caution
: Connect transmission lines at the TMA2Q before connecting
to the LPC2Q, and before connecting at the LPC2Q momentarily short
the center contact of the cable connector to the shell to dissipate any
static build-up in the cable. Never apply a short to the RF In + dc port
of the LPC2Q.
Caution
: To minimize transient voltage damage to active components
in the TMA2Q and LPC2Q assemblies and to prevent accidental
opening of the overcurrent protection circuits in the LPC2Q, DO NOT
apply power to the LPC2Q until all transmission line connections have
been made between the TMA2Q and LPC2Q.
0.375in.
4.00in.
8.75in. min, 8.875in. max
0.3125in.
Enclosure Mounting Dimensions
NOT TO SCALE
