Balanced FM Combiners 3 Pole Filter module

Balanced FM Combiners 3 Pole Filter module
PRODUCT DATASHEET
CA3P400IB-318
Balanced FM Combiners
3 Pole Filter module
RFS offers a comprehensive product line of FM combiners to suit a wide
range of applications. The balanced (or constant impedance) bandpass
design offers an expandable system that is built in a modular form
enabling extra stations to be added at a future date. This configuration
provides state of the art performance with the best frequency response
and isolation attainable.
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A module consists of a balanced pair of bandpass filters, two 3dB
couplers and a balancing load.
The narrowband input corresponds to the filter resonant
frequency, whereas the wideband input can be any other
frequency across the FM band. Modules can therefore be
cascaded to form a multichannel combiner.
A balancing load absorbs narrowband reflections within the
module and any wideband signal that passes through the filter
network. This property of redirecting signals between the output
and balancing loads results in the transmitter working into a 50
ohm system across the full operating bandwidth of the antenna.
The narrowband signal is split by the input coupler, passes
through the bandpass filters and is recombined in the output
coupler to add at the output port.
Wideband signals are split by the output coupler, then reflect
from the bandpass filters and, as the path lengths are identical,
recombine in the output coupler to add at the output port.
Isolation between the inputs is provided by the output coupler
directivity and the filter selectivity.
Showing integrated combiner using 3 Pole 400 mm
filter
FEATURES / BENEFITS
Compact size for given power rating
Vertical entry and exit without additional elbows
Can be field retuned to any frequency in the 87.5 - 108MHz band
2 and 3 pole bandpass filter versions standard
Natural convection cooling for all power levels
Suitable for channel spacings as close as 800kHz
Group delay corrector modules available for complex multichannel systems
Larger units shipped in "knock-down" condition for ease of handling through
standard doors and elevators
Custom options such as patching facilities and power monitoring are
available
Input/output line sizes can be varied to suit using RFS developed R series
adaptors.
Technical Features
STRUCTURE
Product Line
Combiner Radio
Product Type
Band II (VHF) FM Balanced Combiner
Filter Type
Integrated
ELECTRICAL SPECIFICATIONS
Frequency Range
MHz
Frequency Range comment
87.5 - 108
Field tunable
Minimum Channel Spacing
0.8 MHz
Narrowband Input Power (maximum)
kW
8.2
Output Power (maximum)
kW
40.0 Ave
Impedance (unbalanced)
ȍ
Number of Poles
50.0
3
Input Return Loss
dB
>30 to ±200kHz
Input Group Delay variation over Channel Bandwidth
ns
< 25 to ±100kHz *
Narrowband Input Connector
1-5/8" EIA
Narrowband Insertion Loss at Channel Centre Frequency
dB
0.35
Intermod Spurs (10dB Tx Conversion Loss)
dB
< -80 at minimum ch spacing
CA3P400IB-318
REV: 01
All information contained in the present datasheet is subject to confirmation at time of ordering
REV DATE: 14/01/2016
www.rfsworld.com
Page 1 of 2
PRODUCT DATASHEET
CA3P400IB-318
Balanced FM Combiners
3 Pole Filter module
Wideband Input Min. Insertion Loss
dB
0.1 *
Min. Narrowband to Narrowband Isolation
dB
50
Isolation comment
At minimum channel spacing
Amplitude Variation
dB
Amplitude Variation Comment
<0.1 to ±120kHz
May vary at minimum channel spacings.
MECHANICAL SPECIFICATIONS
Wideband Input Connector
3-1/8" EIA
Output Connector
3-1/8" EIA
Weight
kg (lb)
145 (320)
Dimensions (Height or Length)
cm (in)
140.0 (55)
Dimensions (Width)
cm (in)
90.0 (35)
Dimensions (Depth)
cm (in)
120.0 (47)
Combiner Module Configuration
External Document Links
Multistation Combiner Arrangement
Notes
* May vary at minimum channel spacings.
CA3P400IB-318
REV: 01
All information contained in the present datasheet is subject to confirmation at time of ordering
REV DATE: 14/01/2016
www.rfsworld.com
Page 2 of 2
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