COM-TECH innovative and proprietary equalized-response Directional Coupler probe technology, delivering a very accurate and flat coupling level equalization all over its operating band (typical flatness: ±0.05 dB). Accuprobe provides enhanced wideband agility on Transmitters (frequency changes do not affect the measured level), and constant output level for every frequency on Combiners (frequency correction table not required).
COM-TECH products are all Beryllium Oxide free, in accordance with the directive 2003/36/EC, which has classified Beryllium Oxide as “Carcinogenic”, and has thereof restricted its use and imposed safety rules in processing it. COM-TECH Loads use Aluminum Nitride (AlN), a non-toxic and environmentally-friendly material.
COM-TECH innovative design providing the highest Quality Factor in the smallest space, for very compact VHF B.I and FM Bandpass Filters and Combiners.
COM-TECH innovative and proprietary Rigid Line system for indoor applications It comprehends a complete range of components from 7/8’’ to 6+1/8’’, it is compatible with EIA and WX standards, and offers, in addition to traditional Rigid Line systems, three extra features: Socket-Plug connections, Aluminum/Copper lines, Zero-Cutback interfaces.
COM-TECH innovative interdigital resonator design, for ultra-compact low-power VHF B.I Filters and Combiners.
COM-TECH innovative interdigital resonator design, for ultra-compact low-power VHF B.I Bandpass Filters and Combiners.
COM-TECH innovative heat management solution for Lowpass Filters, allowing very high input powers.. Integrates a specifically-designed radial Heat Sink.
COM-TECH innovative and proprietary design, providing an ultra-flat frequency response, and an enhanced Return Loss and Isolation. MultiStep grants agile connection of several modules with unparalleled performances on Balanced Combiners, and accurate power balance on Antenna Systems.
COM-TECH innovative resonator design, for very compact VHF B.III Filters and Combiners.
COM-TECH innovative and proprietary Extracted-Pole Elliptical-Response design, featuring two transmission zeros in a compact, in-line form-factor. Implemented in 6 and 7-Pole filter designs. Allows Adjacency Combination on Balanced Combiners.
Adjacent-Channel/Block Combination is not possible. The minimum combination spacing required is the "Second-Adjacent": one TV guard channel (e.g. 21-23-25) or one DAB guard block (e.g. 12A-12C-12E).
COM-TECH products are known for their reliability. All passive products are guaranteed for 10 years. Active products (E.g. Forced Air Cooling, etc.) and resale products are guaranteed for 2 years.
4-Pole filter design, with no transmission zeros. Allows Adjacent-Channel Combination on Manifold Combiners. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| Non Critical ≤ 5 W | Simple | - |
4-Pole filter design, with COM-TECH exclusive A.N.T. "Super Narrow Tuning" response, implemented on Low-Power Balanced Combiners. Allows Adjacent-Channel Combination. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| Non Critical | Simple Stringent* | Non Critical |
5-Pole filter design, with no transmission zeros. Allows Adjacent-Channel Combination on Manifold Combiners. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| Non Critical ≤ 10 W | Simple Stringent* | Non Critical* |
6-Pole filter design, with no transmission zeros. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| - | Stringent Full Service* | - |
| DVB-T | ATSC | ISDB-T |
| Non Critical | Full Service | Non Critical Sub Critical* |
6-Pole DAB filter design with DualCross Double Cross-Coupling, featuring four transmission zeros. Allows Adjacent-Block Combination on Balanced Combiners. Suitable for the following masks:
| DAB |
| Case 1 Case 2 |
6-Pole filter design with XLine Extracted-Pole Elliptical-Response, featuring two transmission zeros. Allows Adjacent-Channel Combination on Balanced Combiners. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| Non Critical | Simple Stringent* | Non Critical* |
7-Pole DAB filter design, with no transmission zeros. Allows Adjacent-Block Combination on Balanced Combiners. Suitable for the following masks:
| DAB |
| Case 1 Case 2 |
7-Pole filter design with XLine Extracted-Pole Elliptical-Response, featuring two transmission zeros. Allows Adjacent-Channel Combination on Balanced Combiners. Suitable for the following masks:
| DVB-T | ATSC | ISDB-T |
| Critical | Stringent | Sub Critical Critical* |
| DVB-T | ATSC | ISDB-T |
| Critical | Increased Atten. UHD Korean | Critical |
8-Pole DAB filter design with DualCross Double Cross-Coupling, featuring four transmission zeros. Allows Adjacent-Block Combination on Balanced Combiners. Suitable for the following masks:
| DAB |
| Case 3 Case 4 |
COM-TECH exclusive A.N.T. response design, implemented on Low-Power Balanced Combiners. Allows Adjacency Combination.
Adjacent TV channels (e.g. 21-22-23) or DAB blocks (e.g. 12A-12B-12C) can be combined in the same combiner. Requires a Mask-Combiner configuration (Filters in the transmitters are either absent or removed).
COM-TECH All-pole design. Implemented in 2, 3, 4, 5, and 6-Pole filter designs. Does not allow Adjacency Combination.
At high altitudes, due to the decreased thermal dissipation of rarified air, power ratings must be reduced:
| Altitude | Relative Power |
| 0 - 1.500 m (4.900 ft.) | 100% |
| 2.000 m (6.500 ft.) | 97.5% |
| 2.500 m (8.200 ft.) | 95.1% |
| 3.000 m (9.800 ft.) | 92.8% |
| 3.500 m (11.400 ft.) | 90.5% |
| 4.000 m (13.000 ft.) | 88.2% |
Filters and Combiners may undergo an additional power reduction due to decreased dielectric strength of rarified air, which affects their voltage safey factor. The altitude voltage derating depends on their design and it is typically impacting when operating at high power with Forced Air Cooling and Liquid Cooling options. COM-TECH carries out specific calculations when an installation at high altitude is involved, in order to maintain a high voltage safety factor.
Patch Panels with compact, integrated, and modular Antenna Splitters, available for several bands, and with different Split ratios. Unbalanced Splitters feature an innovative phase compensated design. They integrate Accuprobe Directional Couplers, with measurements reported on the front panel. The Modular Connector System allows a wide choice of connectors, also allowing to use standard COM-TECH adapters for the front ports. They are equipped with floating and independent Interlock Contacts, and provided with frames.
Suggested Filters / Combiners for ATSC 1.0 / 3.0 Masks:.
| Simple | Stringent | Full Service | Increased Atten. UHD Korean |
| 4-Pole 5-Pole 4-Pole A.N.T. 6-Pole XLine | 5-Pole 6-Pole 4-Pole A.N.T. 6-Pole XLine 7-Pole XLine | 6-Pole 6-Pole DualCross | 8-Pole DualCross |
Completely autonomous solution. The Customer purchases , in advance, the Manifold cable connectors (from COM-TECH) and the spare cable (either from COM-TECH or a local Seller). When a retuning is required, COM-TECH provides the calculated cable lengths for the new frequencies, together with the set-up layout. The Customer needs to cut the cables at the communicated lengths, assemble them, retune the combiner modules, and apply the assembled cables according to the set-up layout.
Simplest and hassle-free solution. When a retuning is required, the Customer purchases from COM-TECH the new cable-set, which is shipped together with the set-up layout. The Customer needs to retune the combiner modules, and, once received, apply the cables according to the set-up layout.
Equivalent size of a single cavity of a Filter or Combiner, measured in mm. A larger Cavity Size means higher maximum input power, lower insertion loss, better efficiency; but on the other hand involves higher costs, dimensions and weight.
Add-on Flange, which can be easily clamped to Rigid Line outers and Socket connections, transforming them into Flange connections. COM-TECH Clamp Flanges feature added threads which simplify the screw connection with other Flanges, avoiding nuts. It is available with FastLine Zero-Cutback, or with Recessed-Cutbacks, depending on the Socket or Rigid Line section it has to be clamped on.
Equivalent Size of coaxial component, with reference to the relative Coaxial Rigid Line, measured in mm:
23: 7-16, 7/8'', WX-20D
39: 1+5/8'', WX-39D
77: 3+1/8'', WX-77D
103: 4+1/2'', 4+1/16''
120: RL-120,WX-120D
152: 6+1/8'',WX-152D
The overall insertion loss of a Balanced Combiner Chain is the sum of the insertion loss of the single module, increased by the sum of the Wideband insertion losses of the succeeding modules: Overall I.L. = Single Module I.L. + (n • Wideband I.L.)
The composition of several digital signals undergoes to a complex statistical process, which deviates from the theoretical voltage composition. COM-TECH Balanced Combiners have been dimensioned to widely sustain the increased voltage peaks caused by the vector composition of several signals (up to 10 frequencies).
The combination of several Balanced Combiner modules involves a derating of the overall Return Loss:
| No. of Modules | Overall Return Loss (VSWR) |
| 1 | 26 dB (1.11) |
| 2-5 | 25 dB (1.14) |
| 6-8 | 24 dB (1.16) |
| 9-10 | 23 dB (1.18) |
COM-TECH Balanced Combiners have been dimensioned to withstand the overall output power, even in Wideband mode (the Wideband input power having a double impact on hybrid couplers), thus making the calculation of the Wideband Input power extremely easy: WB Input Power = Maximum Output Power – Sum of NB Input Powers
| Series | MX, SP, DB ... |
| No. Of Poles | 4, 6, 8 … |
| Technique | E: Cross Coupling, X: XLine, D: DualCross P: All-Pole, N: 2-Notch |
| Cavity Size | 60, 80 … |
| Band | C: UHF, B: VHF B.III, A: VHF B.I-II R: DAB, F: FM |
| No. of Modules (Filtered Chs.) | 2, 3, 4 … |
| Series | HC, HF, DC, PC … |
| Order | 3, 4, 6 …: No. of Slots, Inputs, Ports ... |
| Technique | Q: Quadrature, P: Progressive, A: Accuprobe ... |
| Size | 60, 80 … 39, 77… 64, 100 … |
| Version | 3, 4, 5…: No. of Probes, Balancing ... |
| Band | C: UHF, B: VHF B.III, A: VHF B.I, R: DAB, F: FM |
| C, D: | N Female |
| E, F: | 7-16 Female, Male |
| G, H, I: | 7/8’’ (WX-20D) Socket, Flange, Plug |
| J, K, L: | 1+5/8’’ (WX-39D) Socket, Flange, Plug |
| M, N, O: | 3+1/8’’ (WX/NAX-77D) Socket, Fl., Plug |
| P, Q, R: | 4+1/2’’ Socket, Flange, Plug |
| S, X, T: | RL-120 (WX/NAX-120D) Socket, Fl., Plug |
| U, V, W: | 6+1/8’’ (WX-152) Socket, Flange, Plug |
Balanced structure of two identical bandpass filters and two hybrid couplers, able to double the power of the single filters and providing constant impedance
COM-TECH Single Cross-Coupling design, featuring two transmission zeros. It provides extra selectivity and high efficiency. Implemented in 4- and 6-Pole filter designs. Allows Adjacency Combination on Balanced Combiners.Inputs on the same side
Customer takes care of the retuning. Retuning Instructions and Tools are provided.
Suggested Filters / Combiners for DAB / DAB+ / T-DMB Masks:
.
| Case 1 (Critical) | Case 2 (Uncritical) | Case 3 | Case 4 |
| 7-Pole 6-P. DualCross | 7-Pole 6-P. DualCross | 8-P. DualCross | 8-P. DualCross |
COM-TECH Bandpass Filters and Combiners feature built-in protection against antenna lightning discharges, achieved through a solid DC-Short circuit towards ground, on both the input and output couplings.
Dual-port probe allowing simultaneous FWD and RFL measurements on the same probe, permitting cost and space savings. Featuring Accuprobe technology on both ports, which provides an accurate equalized response (directivity >26 dB). Available for all bands, with SMA or N female connectors. Interchangeable with all COM-TECH probes.
Suggested Filters / Combiners for DVB-T / T2 Masks:
.
| Non Critical ≤ 5 W | Non Critical ≤ 10 W | Non Critical | Critical |
| 4-Pole | 5-Pole | 4-Pole A.N.T. 6-Pole XLine 6-Pole DualCross | 7-Pole XLine 8-Pole DualCross |
A new combiner can be inserted in two possible different positions into the Balanced Combiner chain:
- In the Output (Antenna) side: The new Combiner type must be Balanced, and must be optimized to accept the existing frequencies. The integration requires major mechanical work. The new Combiner is generally bigger
-In the Wideband input: The existing combiner must have its Wideband port Unused, able to accept the new frequencies and withstand the increased power. The new combiner can be Starpoint, Manifold, Balanced (or single Filter). The integration requires reduced mechanical work. The new Combiner is generally smallerRetuning will be handled in COM-TECH premises with the maximum priority, in order to ship the retuned Component back to the Customer with the fastest time, to reduce off-line time as much as possible.
COM-TECH Filters use mnemonic codes:
| Series | CL, FC… |
| No. Of Poles | 4, 6, 8… |
| Design | E: Cross Coupling X: XLine D: DualCross P: All-Pole |
| Cavity Size (mm) | 60, 80… |
| Operating Band | C: UHF B: VHF B.III A: VHF B.I R: DAB F: FM |
COM-TECH Flange connection features added threads which simplify the connection with screws with other Flanges, avoiding nuts. Provides full compatibility with EIA Flange connections, regardless of the manufacturer. Flanges always require Inner Connections. As it is made by a Socket and a Clamp Flange, the Flange can easily be removed, to expose the Socket connection.
Dry Load brick, to be integrated by the Customer either on a Heat Sink or on a Liquid Cooled Cold Plate. Special highly conductive thermal paste providable upon request.
Provides a dramatic reduction in over-temperature of Bandpass Filters and Combiners, and consequently allows an increase in maximum operating power. Stand-alone system, featuring DC 24 V brushless, microprocessor-controlled, variable-speed fans, engineered to be easily replaced. Includes a multi-standard (110-230V, 50-60 Hz) switching power supply, and a contact alarm for over-temperature, missing power or any kind of electrical failure. Add-on option, which can be conveniently added at a later stage.
COM-TECH Bandpass Filters and Combiners are fully tunable throughout their operating band, in accordance with all worldwide standards and regulation masks. They are engineered to be easily tuned, using a standardized and limited set of tools. Customer-defined tunings are available on request.
Standalone Dry Load with integrated Heat Sink. Must be installed with fins in vertical position, and no obstructions to air flow.
Specifically designed for COM-TECH Bandpass Filters and Combiners to efficiently reduce over-temperature and consequently increase maximum operating power. Add-on option, which can be conveniently added at a later stage.
COM-TECH Hybrid Couplers efficiently sum the power of a pair of power amplifiers. Thanks to the Rack-Unit Connector Spacing, they can be conveniently plugged-in directly at the back of the amplifiers, avoiding the use of cables. Quick-Plug Connectors are available for a fast and lock-free connection.
An Inner Connection is always necessary to connect two Flange connections. Includes Nuts and Bolts for the relative Flanges.
Inner Supports are required to sustain the inner conductor in long Rigid Line sections, and must be placed, cutting the inner conductor, at specified lengths.
Suggested Filters / Combiners for ISDB-T Masks:
.
| Non Critical | Sub Critical | Critical |
| 4-Pole A.N.T. 5-Pole 6-Pole XLine 6-Pole DualCross | 7-Pole XLine 6-Pole DualCross | 8-Pole DualCross |
Dry Load brick, including a Fluid-Dynamic-optimized liquid cooling internal circuit. To be integrated with an external Liquid Cooling system. Compatible with most NTP connecting threads and with most coolant liquids. Beo Free.
Provides a dramatic reduction in over-temperature of Bandpass Filters and Combiners, and consequently allows an increase in maximum operating power. Requires an external Liquid Cooling system (Transmitter). Compatible with most NTP connecting threads and with most coolant liquids, and includes a temperature sensor. Add-on option, which can be conveniently added at a later stage.
Manifold Combiners require cables with specific lengths, depending on the frequency set. A frequency change in the chain requires the cables lengths to be modified. Beyond offering the Substitution Program, COM-TECH also offers three solutions, providing, thanks to a proprietary Functional Model Simulation, the optimized cable lengths for the new frequencies, and making the retuning of Manifold combiners straightforward and fast. A lowered wrench, provided by COM-TECH, is necessary for the modules retuning.
Combiner configuration which makes use of Mask Bandpass Filters (6, 7, and 8-Pole), and consequently Filters in the transmitters are either absent or removed. This approach is mandatory for Adjacent-Channel Combination, and delivers, beyond that, the highest system efficiency, and a complete agility of the transmitters.
COM-TECH Matching Line feature a 5-section matching trunk, and allow to improve the matching of a Transmission Line.
COM-TECH products feature an innovative and proprietary Modular Connector System, which allows a wide choice of connections to be mounted on the same product. It also permits easy replacement of most connectors by the Customer, at a later stage.
Modular 90° Angular Connection, which, thanks to COM-TECH Modular Connector System, allows a wide connector choice, both in terms of size (1+5/8’’, 3+1/8’’, etc.) and type (Socket, Plug, Flange) on both sides, permitting to create 90° elbows with maximum versatility: eg: 1+5/8’’ Zero-Cutback Socket on one side, 3+1/8’’ Recessed-Cutback Plug on the other side. Fine Match screw available (removable on request).
COM-TECH Modular Frame System allows a complete Combiner modularity, providing an easy and convenient possibility of extension, integration, maintenance and shipment (combiners can be shipped as separate modules, and later assembled and installed on site). It can be integrated with Directional Couplers, Patch Panels, and other components.
Modular Straight Connection, which, thanks to COM-TECH Modular Connector System, allows a wide connector choice, both in terms of size (1+5/8’’, 3+1/8’’, etc.) and type (Socket, Plug, Flange) on both sides, permitting to create between-series adapters with maximum versatility: eg: 1+5/8’’ Zero-Cutback Socket on one side, 3+1/8’’ Recessed-Cutback Plug on the other side.
Combiner configuration which makes use of No-Mask Bandpass Filters (3 and 4-Pole), while Mask Filters are built-in the Transmitters. This approach does not allow Adjacent-Channel Combination, and is usually adopted with existing Transmitters already having their own built-in filters.
Number of Poles (or Cavities, or Resonators) of a Filter or a Combiner. A larger Number of Poles means more selectivity (typically required by more demanding transmission masks); but on the other hand involves higher insertion loss and lower efficiency, together with higher costs, dimensions and weight.
Two-port probe with external load, with conventional frequency response, working on an extended frequency range. Suitable for legacy and traditional applications. Interchangeable with all COM-TECH probes.
These Oil and Water Loads are available, depending on the model, with different cooling techniques, most requiring external power supply.
- Oil: Oil Load with integrated Heat Sinks (does not require external power supply)
- Oil + Forced Air: Oil Load with integrated heat sinks, cooled down by a forced air system
- Oil Circulation + Forced Air: closed-circuit-circulation Oil Load, cooled down by a forced air system
- Water Circulation + Forced Air: closed-circuit-circulation Water Load, cooled down by a forced air systemCOM-TECH takes care of the Retuning, limiting the transmission interruption time as much as possible
Frequency bands for TV and Radio applications, with relative standards and coding:
(C) UHF: 470 - 862 MHz, DVB-T/T2, ATSC 1.0/3.0, ISDB-T
(B) VHF B.III: 174 - 240 MHz, DVB-T/T2, ATSC 1.0/3.0, ISDB-T
(A) VHF B.I: 54 - 88 MHz, ATSC 1.0/3.0, ISDB-T
(R) DAB: 174 - 240 MHz, DAB/DAB+
(F) FM: 87.5 - 108 MHz
COM-TECH products conform to the following Operational, Transport, and Storage conditions:
ETSI EN 300 019-1-3 V.2.4.1 (2014-04), Class 3.1, Normal Conditions
Maximum Operating Temperature: see Product Datasheet
ETSI EN 300 019-1-2 V.2.2.1 (2014-04), Class 2.2
ETSI EN 300 019-1-1 V.2.2.1 (2014-04), Class 1.1
COM-TECH products are designed for indoor use, and are not waterproof. Maximum attention should be carried out to prevent contact with water, especially during transportation and installation.
COM-TECH Bandpass Filters are equipped with a capacitive, non-directive Monitor Probe, providing a reference signal on the output port. The probe connector can be SMA or SMB female, and can be mounted on both sides, according to the position of the output port.
Native interface for 3+1/8'', allows connections from N to 4+1/2'':
| Code | Connection |
| - | N, 7-16, 7/8'', 1+5/8'' |
| D-PC100M | 3+1/8’’ Socket (Default), WX-77D Socket |
| D-PC100N | 3+1/8’’ Flange |
| D-PC100O | 3+1/8’’ Plug, WX-77D Plug |
| D-PC100P | 4+1/2’’ Socket |
| D-PC100Q | 4+1/2’’ Flange |
Native interface for 4+1/2'', allows connections from N to RL120:
| Code | Connection |
| - | N, 7-16, 7/8'', 1+5/8'', 3+1/8'' |
| D-PC130P | 4+1/2’’ Socket (Default), WX-103D S., 4+1/16'' S. |
| D-PC130Q | 4+1/2’’ Flange, 4+1/16'' Flange |
| D-PC130R | 4+1/2’’ Plug |
| D-PC130S | RL-120 Socket |
| D-PC130X | RL-120 Flange |
Native interface for RL-120, allows connections from N to 6+1/8'':
| Code | Connection |
| - | N, 7-16, 7/8'', 1+5/8'', 3+1/8'', 4+1/2'', 4+1/16'' |
| D-PC150S | RL-120 Socket |
| D-PC150X | RL-120 Flange |
| D-PC150T | RL-120 Plug |
| D-PC150U | 6 +1/8'' Socket |
| D-PC150V | 6 +1/8'' Flange |
| D-PC150W | 6 +1/8'' Plug |
Native interface for N, allows connections from N to 7-16:
| Code | Connection |
| D-PC25C | N Female (Default) |
| D-PC25D | N Male |
| D-PC25E | 7-16 Female |
| D-PC25F | 7-16 Male |
Native interface for 7-16, allows connections from N to 1+5/8'':
| Code | Connection |
| D-PC32C | N Female |
| D-PC32D | N Male |
| D-PC32E | 7-16 Female (Default) |
| D-PC32F | 7-16 Male |
| D-PC32G | 7/8’’ Socket, WX-20D Socket |
| D-PC32H | 7/8’’ Flange |
| D-PC32I | 7/8’’ Socket, WX-20D Socket |
| D-PC32J | 1+5/8’’ Socket, WX-39D Socket |
| D-PC32K | 1+5/8’’ Flange |
| D-PC32L | 1+5/8'' Plug |
Native interface for 1+5/8'', allows connections from N to 3+1/8'':
| Code | Connection |
| - | N, 7-16, 7/8'' |
| D-PC64J | 1+5/8’’ Socket (Default), WX-39D Socket |
| D-PC64K | 1+5/8’’ Flange |
| D-PC64L | 1+5/8’’ Plug, WX-39D Plug |
| D-PC64M | 3+1/8’’ Socket, WX-77D Socket |
| D-PC64N | 3+1/8’’ Flange |
| D-PC64O | 3+1/8’’ Plug |
COM-TECH Plug connection is the male counterpart of the Socket connection. Allows direct, compact, and efficient connection to Rigid Line sections and COM-TECH Sockets, avoiding the use of Flanges and Inner connections. It is equipped with an external clamp ring which allows to secure the connection. It is available, for selected sizes, also in a special “Quick Plug” version, which allows a fast and lock-free connection. It is available with FastLine Zero-Cutback, or with Recessed-Cutbacks depending on the Socket or Rigid Line section it has to be connected to.
Angular Elbow with Plugs on both sides
Allows to join two Rigid Line sections, two Sockets, or a Socket with a Rigid Line section
Available with FastLine Zero-Cutback or with Recessed-Cutbacks, depending on the Sockets or Rigid Line sections it has to be connected to
Fine Match screw available (removable on request)
Straight Junction with Plugs on both sides. Allows to join two Rigid Line sections, two Sockets, or a Socket with a Rigid Line section. Available with FastLine Zero-Cutback or with Recessed-Cutbacks, depending on the Sockets or Rigid Line sections it has to be connected to.
Simple and immediate solution. The Customer purchases, in advance, from COM-TECH a kit of premade cables of varied lengths. When a retuning is required, COM-TECH provides the calculated cable lengths for the new frequencies, together with the set-up layout. The Customer needs to retune the combiner modules, pick the cables with the communicated lengths and apply them according to the set-up layout. The cables kit can be reassorted just purchasing the cable lengths needed.
COM-TECH products are categorized by Series, which are identified by the first two letters of their code. Eg: CL-Series for "Combline" Bandpass Filters, FC-Series for "Folded Combline" Bandpass Filters, DC "Directional Couplers", etc.
Innovative solution to combine high-power amplifiers (ideal for liquid-cooled transmitters), which makes use of Progressive Multicouplers and Splitters. This system delivers the maximum possible Transmitter efficiency (Typical 99% – 0.04 dB overall I.L.), and a high port isolation (>30 dB), allowing partial operation and hot replacement of the amplifiers. An integrated Liquid Cooled Load is available as an Option for the Multicoupler.
Cost-effective solution to combine low and medium power amplifiers (ideal for air-cooled transmitters), which makes use of Quadrature Multicouplers and Hybrid Couplers. This system delivers the maximum possible Transmitter efficiency (Typical 99% – 0.04 dB overall I.L.), and a high port isolation (>30 dB), allowing partial operation and hot replacement of the amplifiers. Requires Quadrature Splitters.
Specifically designed for COM-TECH products, and compatible with standard 19’’-Racks. COM-TECH provides standard and customized solutions (including front panel custom painting) to integrate Bandpass Filters, Lowpass Filters, Combiners, Directional Couplers and other components into Rack-Shelves.
Components with Rack-Unit Connector Spacing have input connectors exactly spaced by a multiple of Rack Units, allowing them to be plugged-in directly to the Power Amplifiers outputs, avoiding the use of cables. Quick-Plug Connectors are available for a fast and lock-free connection. Available on most Hybrid Couplers and Multicouplers.
Remote Assisted Retuning can be offered for simple Filters and Combiners
requires network analyzer hooked up to a fast internet connection, and trained personnel
COM-TECH offers several options for Retuning:
- On-Site Retuning: COM-TECH takes care of the entire retuning process, limiting the transmission interruption time as much as possible.
- Factory Retuning: Once the product has been received, Retuning will be handled in COM-TECH premises with the maximum priority, in order to ship it back in the fastest time.
- Remote-Assisted Retuning: Remote assisted Retuning is possible for simple Filters and Combiners. The Customer must have a network analyzer hooked up to a fast internet connection, and trained personnel
COM-TECH can provide Tuning Instructions for all its Bandpass Filters and Combiners. A complete Toolkit is available on request, including all the tools needed to retune all COM-TECH Filters and Combiners.
COM-TECH FastLine Rigid Lines use Highly Conductive ETP copper for the inner conductor, and Highly Conductive hardened aluminum for the outer conductor. The advantages, compared to full ETP copper Rigid Lines (available on request), are: better mechanical properties (stiffness and lightness), higher resistance to environmental agents (the outer does not need to be painted), optimal temperature behavior (thermal expansion compensation between Inner and Outer), and a significant price reduction.
Single-port probe, featuring an Integrated Load and a convenient Short-Circuit Button, which can simulate a full reflection for directivity check and amplifier shut-down protection test. Featuring Accuprobe technology, which provides an accurate equalized response (directivity >32 dB). Available for all bands, each of them with different coupling ranges, with SMA or N female connectors. Interchangeable with all COM-TECH probes.
COM-TECH Socket connection reproduces a rigid line section: its inner and outer conductors have the exact same dimensions of the relative Rigid Line. Allows direct, compact, and efficient connection to COM-TECH Plugs (including Elbows and Junctions), avoiding the use of Flanges and Inner connections. A Clamp Flange can easily be added on top of it transforming it into a EIA-compatible Flange. It is available with FastLine Zero-Cutback, or with Recessed-Cutbacks.
Power ratings reported in the datasheets refer to the following standard conditions:
Altitude: below 1.500 m (4.900 ft.)
No Rack-Shelves, no enclosures, no obstructions to natural air flow
Heat Sinks: fins in vertical position, and no obstructions to air flow
Liquid Cooling: Glycol 30%, Temp. 45 °C, Flow 6 l/min
Combiners: Non-Adjacency
Body temperature below the maximum operating value
Simple construction made of two hybrid couplers and a phasing line. This architecture has major limitations and compromised performances. The diminutive selectivity makes it difficult to combine neighboring frequencies. Providable upon request.
COM-TECH Substitution Program permits the seamless substitution of the new Filter or Combiner combiner with the old one, with a very limited Transmission interruption time, and avoiding the retuning to the Customer:
1. COM-TECH ships a new (or refurbished) Filter / Combiner, tuned on the new frequencies
2. Customer substitutes the received Filter / Combiner with the existing one and ships back the latter
3. Once received, COM-TECH evaluates the old Filter / Combiner and refunds it accordingly
COM-TECH Filters and Combiners feature state-of-the-art Temperature Stabilization, achieved through 3D EM and Fluid Dynamic simulations, special materials, and environmental and laboratory tests.
COM-TECH offers different Tuning Training programs to its Customers, divided into theory and practice modules. All courses are studied and customized, starting from the choice of the location (COM-TECH or Customer’s premises), the number of attendees, topics and products to delve into. An attendance Certificate is issued to all participants.
The Wideband port, available only in Balanced Combiners, delivers a unique versatility to Balanced Combiners, allowing to expand their combining possibility by connecting several Modules in cascade. A chain of n Balanced Modules has n Narrowband inputs and one Wideband input port. The Wideband port can be either be Used (connected to a Filter or a Combiner) to combine additional frequencies, or left Unused (connected to a Load), in order to allow future expansion.
The Wideband port can be either optimized for specific frequencies or for the whole band:
- Frequency Optimized: the Return Loss is optimized for the best values on the specified frequencies, at the expense of reducing the values outside. Extension is limited to the optimized frequencies
-Whole-band Optimized: the Return Loss is optimized to have the best tradeoff on the whole band. Extension is possible, but with limitations on all frequencies
Combiners with MultiStep technique have unparalleled performances, allowing an almost optimal Return Loss value on the whole band.
The Wideband input port can be either be Used, or left Unused for future extension:
- Used: the Wideband port is connected to a Filter, Starpoint, Manifold Combiners (or existing combiner), in order to effectively combine 1, 2 or more frequencies. This approach is cheaper, but does not allow future expansion
- Unused: the Wideband port is connected to a Load. All frequencies to be combined require a Balanced Combiner module. This approach is more expensive, but allows future expansion
COM-TECH FastLine Zero-Cutback connections have no offset between the Outer and Inner conductors. The flush interface allows fast, convenient and simple installations. Zero-Cutback connections require specific Clamp Flanges, Elbows, Junctions, Plugs, and are not compatible with Recessed-Cutback connections, and vice-versa. Recessed-Cutbacks connections, available on request, have an offset (cutback) between the Outer and Inner conductors. WX, NAX and custom offsets are also available.