SDI LNDA-15RM-C User manual

LNDA-15RM-C
1-50 MHz ISOLATION AMPLIFIER
OPERATING MANUAL
SPECTRADYNAMICS, INC • 1849 Cherry St. Unit 2. • Louisville, CO 80027
Phone: [phone] • Fax: [phone]
www.spectradynamics.com
SPECTRADYNAMICS, INC

LNDA-15RM-C Isolation Amplifier Operating Manual
Copyright © 2021 SpectraDynamics, Inc. All rights reserved.
LNDA-15RM-C: R01-2021/MD

Contents
1.0 Introduction …………………………………………………………………….... 1
2.0 Safety and preparation for use ………………………………..……….…….. 2
2.1 Electrical ……………….…………………………………………….……. 2
2.2 Instrument ……..…………….………………………………….….…….. 3
3.0 Front panel description …….…………………………………………….…… 4
4.0 Back panel description ………………………………………………….……. 5
5.0 Installation ……………………………………………………………….…….. 6
6.0 Operation ……………………………………………………………………… 7
7.0 Troubleshooting ………………………………………………………………. 8
8.0 Specifications …………………………………………………………………. 9
9.0 Warranty and service ………………………………………………………… 10

1.0 Introduction
Page 1
The LNDA-15RM-C is a Low Noise Distribution and Isolation Amplifier, designed for
maximum flexibility in a 19 inch rackmount 1U enclosure, that may contain up to three RF
signal distribution modules. Each module takes one RF input with a frequency range of 1-
50 MHz and provides five isolated outputs. All outputs are AC coupled and the grounds
are DC isolated to reduce the effect of ground loops. The channel-to-channel and reverse
isolation are greater than 95 dB providing ample protection for the signal source and
downstream users.
All output power levels are monitored and compared to a preset threshold of +7dBm to
provide the user with a visual condition of the RF signal through a monitor LED on the
front panel.
The LNDA-15RM-C Amplifier may be customized by selecting the number of inputs
and/or outputs as shown in the table below. Specifications for every option are listed on
page 9.
LNDA-15RM-C Options:
Other LNDA Options:
The LNDA-15RM-B Model does NOT include the DC power operation option.
OPTION Number of Inputs Number of Outputs
LNDA-15RM-B315
LNDA-15RM-B1 110
LNDA-15RM-B2 210
LNDA-15RM-B3 115
OPTION Number of Inputs Number of Outputs
LNDA-15RM-C315
LNDA-15RM-C1 110
LNDA-15RM-C2 210
LNDA-15RM-C3 115

2.0 Safety and Preparation for Use
Page 2
The LNDA-15RM-C Amplifier was designed for indoor use only and is not intended for
operation outdoors or in a wet environment. The instrument may be mounted in a standard
19-inch instrumentation rack or may be used on a laboratory bench.
Inspect the instrument and power cords for damage before first use.
2.1 Electrical safety and preparation for use
Voltages capable of causing injury or death are present in this instrument. Use extreme
caution whenever the instrument cover is removed.
Line Voltage
This instrument is designed to operate with a 100 to 240 VAC, 47 to 63 Hz power source.
Fuse
A 1.0 Ampere 250V 5X10mm slow-blow fuse is used for 100-240 VAC operation.
A 2.0 Ampere 250V 5X10mm slow-blow fuse is used for the DC power protection.
Only replace fuse with the same type and specifications.
AC Power
The instrument has a detachable three wire power cord for connection to a grounded AC
power source. The enclosure of the unit is directly connected to the outlet ground to
protect against electrical shock. Always use an outlet with a protective ground and do not
disable this safety mechanism. Detaching the AC power cord is the only option of
disconnecting the unit from the AC mains supply. Make sure you have access to the rear
panel or provide an external accessible AC disconnect means for the instrument.

2.0 Safety and Preparation for Use
Page 3
2.2 Instrument safety and preparation for use
The LNDA-15RM-C Model is designed to distribute RF signals with a frequency range of
1 to 50 MHz. The recommended level for the RF input signal is +13 dBm +/- 2 dB. Any
output level below +7 dBm will trigger a fault condition turning off the corresponding
monitor LED.
Input signals must be kept below +20 dBm as greater power levels will damage the unit
and void all warranties.
All outputs are DC isolated from the chassis ground to prevent ground loops. These
outputs are rated to a maximum of 50 V.
Absolute Maximum Ratings:
Input RF Power +20 dBm Maximum
Reverse RF Power +20 dBm Maximum
Voltage at the RF Input +50 V Maximum
Voltage at the RF Output +50 V Maximum
Storage Temperature -10 to +75 ºC
Operation Environment 0 to +50 ºC

3.0 Front Panel
Page 4
AC Power LED
The AC Power LED turns on when AC power is applied to unit.
DC Power
The DC Power LED is on when DC power is applied to unit.
Monitor LEDs
The LNDA-15RM-C model may contain up to three RF distribution modules, each module
is monitored by the corresponding MONITOR LED labeled 1, 2 and 3. All MONITOR LEDs
are installed on every LNDA-15RM-C option. Only part numbers LNDA-15RM-C and
LNDA-15RM-C3 come with three functioning monitor LEDs. All other options will have a
non-working monitor LED. Please refer to LNDA-15RM-C table options on page 1.
Monitor LEDs will light up if the corresponding module(s) have output signal(s) level
greater than +7 dBm.
Any RF signal level less than +7 dBm will trigger a fault condition and the corresponding
Monitor LED will not light up. However the LNDA-15RM-C will still provide buffered copies
of the RF input signal on the back panel.

4.0 Back Panel
Page 5
AC Power
The LNDA-15RM-C model is configured to operate on 100 to 240 VAC.
INPUT
The number of available inputs are determined by the LNDA-15RM-C Option. A RF Signal
within the range of 1 MHz to 50 MHz may be connected to any of the SMA connectors
labeled INPUT. Only the LNDA-15RM-C option includes all SMA input connectors as
shown on the picture above. Other options are shown below.
OUTPUTS
The number of available OUTPUTS per RF input are determined by the model number
below. Any LNDA-15RM-C output may be used to drive the input of another distribution
module.
LNDA-15RM-C1:
LNDA-15RM-C2:
LNDA-15RM-C3:

5.0 Installation
Page 6
The instrument may be mounted in a standard 19-inch instrument rack or may be operated
on a laboratory bench.
Connecting Power
The LNDA-15RM-C ships with a standard North American or European IEC power cord
and a RM12BPE-6S(81) DC connector.
You may prepare a DC power cable with the DC connector following the connector
configuration on page 3.
Locate the AC POWER entry module on the rear of the enclosure and connect the power
cord. You may also connect the optional DC POWER Connector to an appropriate DC
power source.

6.0 Operation
Page 7
Plug the power cord into an appropriate AC power outlet. You may also connect the DC
power cable to an appropriate DC power supply.
The LNDA-15RM-C is designed to distribute signals from 1 MHz to 50 MHz. The RF inputs
have a 50-ohm input impedance. Provide a signal within the mentioned frequency range to
any of the SMA input connectors available on the back panel labeled INPUT. If the RF
signal has a power lever greater than +7dBm, the corresponding monitor LED of the
selected module located on the front panel will light up.
Five buffered copies, per distribution module, of the RF signal(s) will be available on the
SMA connectors labeled OUTPUTS located on the back panel. All outputs are AC
coupled and the grounds are DC isolated to reduce the effect of ground loops. Make sure
that the amplifier ground does not float to a potential greater than 50 VDC from the chassis
ground. An output ground potential greater than 50 VDC will damage the amplifier and
could cause injury or death to personnel.

7.0 Troubleshooting
Page 8
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. If there are problems that cannot be
resolved by the troubleshooting steps below please contact technical support.
Technical Support
Tel: [phone] , Fax: [phone]
[e-mail], www.spectradynamics.com
AC and/or DC Power LED does not turn on.
Disconnect the power cords and remove the top cover. Check the main AC and/or DC
power fuse and power cord. If any fuse is blown replace with same type and rating. Please
contact SDI if the any of the fuses blow again or if the event that caused the fuse to blow is
not known.
Monitor LEDs are off.
Check to see if the RF signal provided to the instrument is greater than +7 dBm.
Check to see if a signal is present at all outputs of the signal distribution module.
The Monitor LED will remain off with a power lever under +7dBm, but will still provide
buffered copies of the RF input signal. If the instrument is providing the copies of the input
signals you may continue using the LNDA-15RM-C amplifier.
If the power level of the RF signal provided is greater than +7dBm and the Monitor LEDs
remain off the instrument will have to be returned for repair.

8.0 Specifications
Page 9
All tests done at 5 MHz and +13 dBm input unless otherwise specified.
Specifications are valid for all options of LNDA-15RM-C.
Rackmount chassis 1U H, 19“ W, 14” D
Weight 10 lbs.
AC Input Voltage Range 90-264 VAC, 22 W, 47-63 Hz
DC Input Voltage Range 12-36 VDC, 13 W
Storage temperature -10 to +75 ºC
Operation environment 0 to +50 ºC
Humidity 5% to 95% Non-condensing
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Power Level 1 dB compression 17 18 - dBm
Bandwidth +/- 1 dB 1 - 50 0.5 - 65 - MHz
Gain @ 5 MHz - 0.2 0.5 dB
Impedance Input
Output
-
-
50
50
-
-
Ohms
Return Loss Input (S11) 5MHz
Output (S22) 5MHz
-
-
-30
-30
-25
-25
dB
Distortion +13 dBm
+17 dBm
-
-
-45
-40
-40
-35
dBc
Isolation Output to output
Output to input
95
100
100
105
-
-
dB
Phase Noise 1 Hz
10 Hz
1 kHz
10 kHz
-
-
-
-
-143
-153
-162
-165
-140
-150
-159
-162
dBc/Hz
Temperature-delay
Coefficient
0 - 50 ºC -
-
3 5 ps/ºC

9.0 Warranty and Service
Page 10
The LNDA-15RM-C is warranted to be free of defects under normal operating conditions,
as specified, for one year from date of original shipment from SpectraDynamics, Inc. (SDI).
SDI’s obligation and liability under this warranty is expressly limited to repairing or
replacing, at SDI’s option, any product not meeting the said specifications.
This warranty shall be in effect for one (1) year from the date a LNDA-15RM-C is sold by
SDI. SDI makes no other warranty, express or implied, and makes no warranty of the
fitness for any particular purpose. SDI’s obligation under this warranty shall not include any
transportation charges or costs of installation or any liability for direct, indirect, or
consequential damages or delay. Any improper use, operation beyond capacity,
substitution of parts not approved by SDI, or any alteration or repair by others in such
manner as in SDI’s reasonable judgement affects the product materially and adversely
shall void this warranty. No employee or representative of SDI is authorized to change this
warranty in any way or grant any other warranty.
Service
Do not attempt to service or adjust the instrument unless another person, capable of
providing first aid or resuscitation, is present. Please remember that any alteration or repair
may void the warranty. Contact SDI with any questions or to request an RMA if a repair is
needed.
SpectraDynamics, Inc.
1849 Cherry Street Unit 2.
Louisville, CO 80027
USA
Tel: [phone]
Fax: [phone]
[e-mail]
www.spectradynamics.com

EC Declaration of Conformity
This Instrument has been designed and manufactured in accordance with the below
referenced Standards and complies with all essential requirements of the Directives listed
below.
Directives:
2014/35/EU of the European Parliament and of the Council of 26 February 2014 on
the harmonization of the laws of the Member States relating to the making available on the
market of electrical equipment designed for use within certain voltage limits.
2014/30/EU The Electromagnetic Compatibility Directive and its amending directives.
2011/65/EU of the European Parliament and of the Council of 8 June 2011 on the
restriction of the use of certain hazardous substances in electrical and electronic
equipment.
Standards:
EN 55011 2009 + A1: 2010, Product family standard for Industrial, Scientific and
Medical (ISM) equipment.
EN 61010-1:2010 Safety Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use – Part 1: General Requirements
EN 61326-1:2013 Electrical Requirements for Electrical Equipment for Measurement,
Control and Laboratory Use – Part 1: General Requirements