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).

• Low insertion loss and Good return loss
• Excellent isolation between frequency ranges

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 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

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 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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