LA35Rx Series 1 GHz Compact MDU Amplifiers
Installation Manual
Page 3 of 4
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 & FORWARD OUTPUT LEVEL SETUP GUIDELINES
1.
Adjustable gain and cable slope controls are reachable under the housing lid. Refer to layout scheme above the RF circuit for controls adjustment.
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 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 counterclockwise) before powering the amplifier.
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 output level at the 20 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 20 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.
7.
Now install a plug-in equalizer into the mid-stage equalizer socket to get as close as possible to the desired output signal slope. The desired output slope is
determined by your system design. Consult your system planner or your system maps for this information. Equalizers are available in 2 dB steps from 0-20 dB at 1
GHz.
8.
Make a final adjustment of the slope and output level with the input gain and slope controls. Always adjust the gain control, then the slope control in that order.
9.
Remember to replace lid after adjusting.
INSTALLATION PRECAUTIONS TABLE
Precautions
Requirement
Facilitate service and maintenance
Allow a minimum of 35 in. (90 cm) clearance in front of the equipment rack(s)
Avoid direct heating or air conditioning
If unavoidable, use deflector plates
AC power source outlets
Locate equipment near sufficient outlets to provide power for test equipment and power tools
Rack support
Make certain rack supports are sufficiently rigid to support rack(s)
Building leakage
Beware of dripping water onto equipment from leaky roofs, waveguide roof entries, and cold water pipe condensations
SPECIFICATIONS (JXP-XX JXP-STYLE ATTENUATOR/EQ)
dB
Value
Parameter & Specification
Insertion Loss
Typical Delta Return Loss
S21 @ 5 MHz S21 @ Full Band 5-1200 MHz
5-750 MHz 5-1000 MHz 5-1200 MHz
00
± 0.15 dB
± 0.25 dB
-0.1 dB
25 dB
19 dB
16 dB
01
± 0.15 dB
± 0.30 dB
-0.15 dB
26 dB
24 dB
20 dB
02
± 0.15 dB
± 0.35 dB
-0.2 dB
27 dB
24 dB
21 dB
03
± 0.15 dB
± 0.35 dB
-0.2 dB
25 dB
24 dB
20 dB
04
± 0.15 dB
± 0.40 dB
-0.25 dB
25 dB
24 dB
21 dB
05
± 0.15 dB
± 0.40 dB
-0.25 dB
25 dB
24 dB
20 dB
06
± 0.15 dB
± 0.40 dB
-0.25 dB
25 dB
24 dB
20 dB
07
± 0.15 dB
± 0.40 dB
-0.25 dB
25 dB
24 dB
20 dB
08
± 0.15 dB
± 0.46 dB
-0.3 dB
25 dB
23 dB
20 dB
09
± 0.15 dB
± 0.46 dB
-0.3 dB
25 dB
24 dB
20 dB
10
± 0.15 dB
± 0.46 dB
-0.3 dB
25 dB
24 dB
20 dB
1.2" (3.0 cm)
0.5" (1.3 cm)
0.2" (0.5 cm)
ORDERING INFORMATION
Part #
Description
LA35R 42/54 VER 10-36V 1.0GHz
1 GHz, 2-way amplifier with 35 dB gain forward, 18 dB gain reverse, 42/54 MHz diplexer, 10-36 VDC
LA35R 65/85 VER 10-36V 1.0GHz
1 GHz, 2-way amplifier with 35 dB gain forward, 18 dB gain reverse, 65/85 MHz diplexer, 10-36 VDC
LA35R 42/54 VER 90-240V 1.0GHz
1 GHz, 2-way amplifier with 35 dB gain forward, 18 dB gain reverse, 42/54 MHz diplexer, 90-240 VAC
LA35R 65/85 VER 90-240V 1.0GHz
1 GHz, 2-way amplifier with 35 dB gain forward, 18 dB gain reverse, 65/85 MHz diplexer, 90-240 VAC
Required Accessory
6506-056
100-240 VAC/15 VDC wall transformer
Optional Accessories
JXP-xx
JXP-style fixed attenuator/EQ (xx = dB value; available values = 00,01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,19,20)
