LHA35RM 1 GHz MDU Distribution Amplifier
Installation Manual
Page 2 of 3
SPECIFICATIONS
Parameter
Specification
(1)
Forward GaAs FET Push-Pull
Reverse
Bandwidth
54-1000 MHz
5-42 MHz
Full Gain (Min.)
(2)
35 dB
18 dB
Flatness
± 1 dB
Return Loss
In/Out
-16 dB
Test Points
-30 dB (output)
Gain Control
Variable
0-20 dB (input)
0-20 dB (output)
Slope Control
Variable
0-20 dB cable (input)
Fixed Equalizers
(3)
Mid-stage
Forward Distortions: 42 dBmV flat output (79 channels)
(4)
CTB
On CH 78
-62 dBc
CSO
On CH 78
-66 dBc
XMOD
On CH 2
-60 dBc
Forward Distortions: ref 44 dBmV output (79 channels, 12 dB intersage slope, 54-1000 MHz)
(4)
CTB
On CH 78
-65 dBc
CSO
On CH 78
-72 dBc
XMOD
On CH 2
-63 dBc
Reverse Distortions: 52 dBmv flat output, 4 CH
3rd on T10
T8+T9-T7
-68 dBc
2nd on T9
T7+12 MHz
-65 dBc
XMOD on T10
T7, T8, T9, T10
-64 dBc
Noise Figure
7 dB
Group Delay
Fwd (55, 25-58.83 MHz)
38 ns (max.)
Rev (41-42 MHz)
35 ns (max.)
Power, Environmental & Physical
Hum Modulation
-70 dB
RFI Isolation
5-1000 MHz
-100 dB
Surge Withstand
In/Out
IEEE C62.41-Cat A3, 6 kV, 200 A
Powering
Mains, 117 VAC
Power Consumption
8 W
Enclosure
IP54 category, diecast aluminum
Operating Temperature
-10°C to +55°C (+14°F to +131°F)
Dimensions (H x W x D)
7.6”H x 5.4”W x 3.0”D (19.3H x 13.7W x 7.6D cm)
Weight
3.8 lb (1.7 kg)
NOTES:
(1)
Specifications are typical, for T=20°C, ZIN=ZOUT=75 ohms
(2)
Tolerance on station gain is ± 2.0 dB
(3)
Model GE XX equalizers available in 12 & 14 dB at 1000 MHz
(4)
Digital output levels are lower
NOTE TO CATV SYSTEM INSTALLER
This reminder is provided to call the CATV system installer’s attention to Article 820-40 of the NEC that provides guidelines for proper grounding and, in particular,
specifies that the cable ground shall be connected to the grounding system of the building, as close to the point of cable entry as practical.
INSTALLATION & SETUP GUIDELINES
1.
Adjustable gain and cable slope controls are reachable under the cover. Refer to layout scheme for adjustable controls.
2.
This product is shipped with default 0 dB pad for plug-in interstage equalization.
3.
Before applying power to the amplifier make sure that the forward input level to the amplifier is not too high or damage to the amplifier might occur. To be on the safe
side, you should set the input gain control adjustment to minimum gain (fully counter clockwise) before powering the LHA.
4.
Set the input equalizer control for minimum slope (fully clockwise) and install a 0 dB plug in equalizer (factory installed) into the mid-stage equalizer socket.
5.
Now apply power to the amplifier and measure the amplifier forward output level at the 30 dB output test point. If it is very low then turn the input gain control
clockwise to increase the gain until the desired output level is reached at the highest operating frequency. Remember that the level measured at the test point is 30
dB lower than the real signal level.
6.
Turn the input equalizer control to adjust the forward output level to be flat across the full bandwidth. The input signal level will now be flat too. Under this condition
there will be best CNR across the full bandwidth.
