User Manual
7. DC Power Injector Connections and Indicators
This LED glows RED when the pole mounted amplifier goes into transmit
amplification mode. The Remote Transmit LED is controlled by unique
circuitry, which actually detects changes in the DC current traveling through
the transmission line to the amplifier. When you see this LED flash, you will
know that the remote pole amplifier is going into transmit mode.
This LED glows GREEN when DC power is applied to the amplifier and it is
in the receive mode. When toggling between transmit and receive this LED
will glow slightly dimmer.
This N-type female connects to the radio via a short jumper cable.
This N-type female connects to the amplifier on the mast using the coax
transmission line.
This is the DC power input for the injector and is a standard 2.1 mm barrel
jack. +12VDC should be applied with center positive.
This jack parallels the 12 VDC jack power jack. It can be used to provide 12
VDC to the radio modem or Access Point using a short DC jumper cable.
Provided that the radio device operates on 12 VDC and draws less then 600
ma, the standard DC power supply that comes with the amplifier kit can be
used to power both it and the amplifier/DC Injector. This extra jack is
installed when the DC-INJ-DUAL option is ordered.
Red Transmit LED:
Green Receive
LED:
“To Radio”
Connection:
“To Amplifier”
Connection:
12 VDC:
AUX 12VDC:
8. Power Supply
The AMP2440 kit comes with a 100 to 240 VAC power supply that has a standard 2.1 mm
barrel plug [center pin positive (+) tip and outer ring negative (-)]. Although normally supplied
with a power supply, any 12 Volt DC, 1 amp (or greater) regulated power supply can be used.
The amplifier can operate from 11 to 14 VDC enabling battery or vehicle operation as well.
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The DC power input is diode protected to prevent damagecaused by reverse polarity input
voltages as well as by an TVS to protect it and the amp from overvoltage surges.
dBm
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Watts
1.0 mW
1.3 mW
1.6 mW
2.0 mW
2.5 mW
3.2 mW
4.0 mW
5.0 mW
6 mW
8 mW
10 mW
13 mW
16 mW
20 mW
25 mW
32 mW
40 mW
50 mW
64 mW
80 mW
100 mW
128 mW
160 mW
200 mW
250 mW
320 mW
Watts
400 mW
500 mW
640 mW
800 mW
1.0 W
1.3 W
1.6 W
2.0 W
2.5 W
3.0 W
4.0 W
5.0 W
6.0 W
8.0 W
10 W
13 W
16 W
20 W
25 W
32 W
40 W
50 W
64 W
80 W
100 W
1000 W
dBm
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
60
Table A - Conversions from dBm to Watts
Table B - Typical Cable Attenuation Values
These values are approximate. Check with cable manufacturers for exact specifications.
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Cable Type
Belden 9913
LMR 200
LMR 240
LMR 400
LMR 600
1/2” LDF
1/2” Superflex
3/8” LDF
3/8” Superflex
1/4” Superflex
Attenuation per 100 ft
at 2.4 GHz (dB)
8.0
16.8
12.9
6.9
4.4
3.9
6.1
5.9
6.8
9.8