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Diplex Filters ( CATV and MATV Band Splitters/Combiners )

CATV Sub to TV Diplexers ( Return Path / TV Band )
General Purpose Diplexers ( 5 to 1000 MHz )
Table: Standard Diplexers at a Glance
Baseband: Audio / Video Diplexer ( DC to 4.2 / 4,5 MHz )
Power Inserter: AC/DC and RF (5-1000 MHz)
Custom Diplexers ( 5 to 1000 MHz )

Sub-TV / TV-Band Diplex Filters for Cable TV

LH7S-40/50 and LH7S-48/54 - Diplexers for 2-way TV systems

High performance band splitter/combiners, designed to provide two-way capability for CATV systems. LH7S-series consist of lowpass and highpass filters joined together to separate or combine the sub-TV band (return path) and TV band (forward path).


4.0"L x 2.5"H x 2.125"W

4.25"L x 3.25"W x 2.5"H(outdoor)


  • Low insertion loss and Good return loss
  • Excellent isolation between frequency ranges
  • DR-82-2A LH7S Graphs



Basic Specifications list:

LH7S- 40/50

LH7S- 48/54

  • Return path: 0 to 40 MHz
  • Forward path: 50 to 750 MHz,
    or 1000 MHz.
  • Mutual Isolation: > 50 dB
  • Return path: 0 to 48 MHz
  • Forward path: 54 to 750 MHz,
    or 1000 MH
  • Mutual Isolation: > 35 dB

Common Specifications:

  • Return path loss: < .75dB ( except < 2 dB at Fc1 )
  • Forward path loss: < 1 dB ( except < 2 dB at Fc2 )
  • General passband ripple: ± .25 dB
  • Return loss: Return path >18 dB; Forward path >16 dB
  • Custom cut-offs ( Fc1, Fc2 ) available
  • Connectors: 75 ohms F- type F/F ( optional BNC )

Example Graphs

LH7 to 40/50

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General Purpose Diplexers: CATV / MATV Band Splitter / Combiner

LH7 Diplexer :

Dim 1.75"H x 19"L x 3"D



Outdoor Diplexer:
Dim: 4.25"L x 2.5"W x 3.25"H

LH7 Series

LH7-series consists of a dual set of filters - lowpass and highpass with a common port - designed to combine two signals (low and high bands) into one output, or, separate the TV/RF spectrum into low and high bands.

  • Low insertion loss (< 1.5 dB), high isolati0on between the frequency bands(>40 dB)
  • Variety of models available - click for Table of Diplexers
  • Custom models available including option for 50 ohms SMA, BNC, N connectors

General Specifications

Bandwidth 0 to 550 / 750 / 860 / 1000 MHz
Custom cutoffs (see fig.1) Fc1 and Fc2 (3 dB cut-offs)
Fc1 = lowpass cut off, and Fc2 = highpass cut of
Fc1 and Fc2: available between 5 to 800 MHz
Passband loss: 1dB ± .5dB, except < 3dB at Fc1 & Fc2
Guard band: Fc1 and Fc2 are frequency separated by 10 %
Example: Fc1 = 300 MHz, Fc2 = 330 MHz ( i.e., 300 x 1.10 = 330 )
Return loss: 14dB typical
Mutual Isolation: > 40 dB (10 % guard band)
Connectors / Impedance: F-type female / 75 ohm

Example Graphs

LH7 470/520

Order Info: ask for model LH7- ( Fc1 / Fc2 )

Specify: Fc1 & Fc2 * ( Fc1 = 3 dB Lowpass cutoff; Fc2 = 3 dB Highpass cutoff )
* Guard band between Fc1& Fc2 is minimum 10% frequency separation

Options for standard LH7:

  1. Operating bandwidth: 1000 MHz
  2. Connectors: BNC (75 ohms)
  3. Outdoor model: specify LH7X
  4. Lowpass port is AC/DC passing ( DC block optional )
  5. Highpass port is not AC/DC passing ( Power pass option - 2 amp max, operating bandwidth is 750 MHz max)

Table: Standard LH7 models

Standard LH7 models are listed below. They can be modified for your special requirements.

Model LH7- (Fc1/Fc2) Passband Low port (MHz) Passband High port (MHz) Mutual Isolation Band Separation (Freq) *
LH7 - 10/14 0 to 10 14 to  750 40 dB min Sub / TV, 4 MHz
LH7 - 33/43 0 to  33 43 to  750 40 dB min Sub / TV, 10 MHz
LH7 - 40/50 0 to  40 50 to  750 40 dB min Sub / TV, 10 MHz
LH7 - 48/54 0 to  48 54 to  750 35 dB min Sub / TV, 8 MHz
LH7 - 65/88 0 to 65 88 to  750 40 dB min VHF / Low, 23 MHz
LH7 - 70/83 0 to  70 83 to  750 30 dB min VHF / Low, 13 MHz
LH7 - 88/108 0 to  88 108 to  750 35 dB min FM, 20 MHz
LH7 - 126/156 0 to  126 156 to  750 40 dB min CATV / Mid, 30 MHz
LH7 - 175/217 0 to  175 217 to  750 40 dB min VHF / High, 42 MHz
LH7 - 210/228 0 to  210 228 to  750 30 dB min VHF-Hi / Sup, 18 MHz
LH7 - 230/470 0 to  230 470 to  900 50 dB min VHF / UHF, 240 MHz
LH7 - 240/258 0 to  240 258 to  750 30 dB min CATV Sup, 18 MHz
LH7 - 300/330 0 to  300 330 to 750 35 dB min CATV Sup / Hyp, 30 MHz
LH7 - 470/520 0 to 470 520 to 800 35 dB min UHF, 50 MHz
LH7 - 500/550 0 to 500 550 to 750 35 dB min CATV / Hyp, 50 MHz
LH7 - 600/660 0 to 600 660 to 750 35 dB min CATV / Hyp, 60 MHz
LH7 - 750/850 0 to 750 850 to 1000 35 dB min CATV / Hyp,100 MHz

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Baseband Diplex Filter ( Audio and Video Splitter / Combiner )

LH7 4.2/4.5
Dim 2.25"H x 5.5"L x 6.5"W

LH7 4.2/4.5

Diplex filter consists of a video lowpass and audio bandpass. High quality base band splitter/combiner, is designed to combine 0 to 4.2 MHz and 4.5 MHz signals, or, separate composite source into video and audio signals. Specifications include

  • Common port: 0 to 6 MHz passband
  • Video port - Passband loss: < 1.0 dB (0 to 3.5 MHz) and <3.0 dB at 4.2 MHz
  • Video port - Return loss (0 to 3.8 MHz): 15 dB min
  • Relative Group Delay - 0 to 3.58 MHz: <300 ns
  • Audio port - Passband Loss: < 5 dB
  • Audio port - Return Loss (4.5 MHz): 15 dB min
  • Mutual Isolation: 30 dB min
  • Standard Connectors: F-type female, 75 ohms
  • Optional Connectors: BNC, 75 ohms

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Power Inserter AC/DC and RF Diplex Filter (DC-1000 MHz)



DR-82-2A or 4A

Dim 2.25"H x 4.0"L x 2.125"W

DR-82-2A DR-82 Info Sheet

DR-82 Power Inserter (Bias Tee)

Diplex filter, DR-82, is designed to combine or separate AC/DC and RF signal (5-1000 MHz). Available with 2 amp and 4 amp capacity, without fuse, with fuse or circuit breaker. DR-82 features include:

  • Low thru loss RF passband (0.75 dB typical)
  • AC/DC to RF isolation >55 dB
  • Return loss (5-1000 MHz): 18 dB typical
  • Relative Group Delay - 5 to 1000 MHz: <20 ns
  • Power INPUT can be fused for 2A or 4A current
  • Circuit Breaker Option available for 4 Amp model
  • Standard Connectors: F-type female, 75 ohms
  • Optional Connectors: SMA, BNC, N, 50 ohms

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