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DX Engineering

Transmit Four-Square

Hybrid Controller—

4 Directions plus Omni

DX Engineering’s TFS4 Series Four-Square

Controllers combine a high level of

engineering excellence with attention to

operator convenience and ease of

installation. The controllers are available

for 160, 80/75, and 40 meters. They allow the

operator to receive or transmit with 5.5 dB gain

in any one of four directions with 20+ dB

front-to-back ratio for interference reduction from

unwanted directions. You can also switch to a single omni-directional pattern with the

push of a button. This combination permits you to listen “all-around”—unhindered by

pattern nulls—and then select the best direction for signal reception and noise rejection.

The TFS4 controllers are designed for use with a four monoband vertical antenna array

spaced at the corners of a square that is 1/4-wavelength on a side. The vertical antennas

must be ungrounded and resonant in the desired band, and should be directly base-fed

by coaxial cable phasing lines from the centrally located controller. DX Engineering has

vertical antennas that are well suited for this application. Above all, a properly designed

and installed radial system is necessary for top antenna performance, whether using a

single vertical or a full array.

DX Engineering strongly recommends our optional QWC Series 1/4-wavelength cables.

They are constructed of the highest quality Belden 8213, an RG-11/U foam dielectric

cable with a velocity factor of 84% (0.84). These cables are cut to a precise electrical

length based on your choice of center operating frequency. They are terminated with

hand-soldered Silver-PTFE PL-259 connectors and weather-sealed with shrink tubing.

Finally, each cable is tested for high voltage breakdown for maximum reliability and

power handling.

If you already have a Four-Square array with a hybrid controller (such as COMTEK

SYSTEMS, etc.) and would like to upgrade to improved performance and the Omni

feature, the DX Engineering TFS4 Series is a direct transplant. BCD logic switching

allows the use of a four-wire control cable to perform the necessary switching functions

when powered by the included DXE-CC-4SQR Control Console.

• Classic Hybrid Design—easy to install

• 5 kW CW Power Rating—high reliability

• Hot S witching Lock-Out—disables amplifier while switching

• Drop-In Replacement for COMTEK SYSTEMS—easy upgrade

• Proven DX Engineering RF Relays—high performance

• High-Impact Shielded Weatherproof Housing—unique protection

DXE-TFS4-160B-P 160 Meter Four-Square Controller with Control Console ............ $609.00

DXE-TFS4-80B-P 80 Meter Four-Square Controller with Control Console .............. $599.00

DXE-TFS4-40B-P 40 Meter Four-Square Controller with Control Console .............. $589.00

The Control Console is also available separately

DXE-CC-4SQR Transmit Four-Square Control Console ................................$199.95

DX Engineering Customer Support personnel will be happy to help you

select all the components necessary for a complete installation.

PVS-2 Two-Element

Phased Vertical Systems

For those who do not have

space for a Four-Square phased

vertical array, COMTEK SYSTEMS o ers the superior PVS-2

two-element phased vertical system. Quality components

are used throughout, yet the system is very a ordable.

• Three direction switching includes

selectable end-fire and broadside directions

• Typical 18 dB front-to-back rejection and 3 dB gain

• Rated at 3 kW continuous Amateur Service duty

• <.05 dB insertion loss

• Includes MOVs for maximum ESD protection

• Amphenol silver tip SO-239s and Potter & Brumfield relays

• Includes a custom, in-house wound UNUN and a 90 degree toroid

• A 4-conductor control line is required

COM-PVS-160-A Phased Vertical System, 160M, 2-Element, 12 Vdc ...........$343.95

COM-PVS-80-A Phased Vertical System, 80M, 2-Element, 12 Vdc ............. $343.95

COM-PVS-40-A Phased Vertical System, 40M, 2-Element, 12 Vdc ............. $343.95

COM-PVS-30-A Phased Vertical System, 30M, 2-Element, 12 Vdc ............. $343.95

COM-PVS-20-A Phased Vertical System, 20M, 2-Element, 12 Vdc ............. $343.95

Accessories

COM-P213-160-P RG-213 Phasing Cable, 160M, Set of 2 ............................... $189.95

COM-P213-80-P RG-213 Phasing Cable, 80M, Set of 2 ................................. $119.95

COM-P213-40-P RG-213 Phasing Cable, 40M, Set of 2 ................................... $89.95

COM-P213-30-P RG-213 Phasing Cable, 30M, Set of 2 ................................... $81.95

COM-P213-20-P RG-213 Phasing Cable, 20M, Set of 2 ................................... $75.95

COM-CW4 4-Conductor Control Cable.......................................per foot $0.28

Antennas: Phased Arrays

ACB-4 Phased Array Systems

for 2- or 4-Element Vertical Arrays

COMTEK SYSTEMS uses state of the art design and

technology to produce the most advanced antenna

systems possible. These Phased Array Systems

are a ordable, simple to install, and easy to use.

A phased array consists of two or more

elements fed in a phase relationship and power

ratio to obtain a directional pattern. COMTEK

SYSTEMS’ phased array switchboxes can be used

with 2- or 4-element horizontal or vertical arrays to provide

the greatest directivity.

We o er the ACB-4 for all amateur bands from 10 meters

to 160 meters. The ACB-4 is band specific—you cannot

use an 80 meter ACB-4 for any band other than 80 meters.

Power Supply/Switch Control

• 12 Vdc operation

• Custom USA-made switch permits 360° rotation

in either direction with no stops

• Current limiting resistor protection for each LED

• Chassis and cover custom manufactured to

COMTEK SYSTEMS specifications

• Lexan® label for recording favored directions

• Compact size: 2" H x 6.25" W x 5" D

90 Degree Hybrid-Relay Matrix

• 15 amp gold-plated contact relays with dust covers

• Belden PTFE silver stranded wire over 3M Fiberglass tape-wound toroids

• Sprague 5% balanced temperature, frequency, and voltage stable capacitors

• Laboratory analyzed for improved performance

• Double-sided printed circuit board

• 2 kW conservative rating for Amateur Radio Service

• Harris MOVs for lightning surge protection with Sprague RF bypass caps

• Brushed aluminum Z-chassis and cover with riveted seams

• Size: 4" H x 6" W x 8.5" D

COM-ACB-160-A Hybrid Phased Array Four-Square System, 160M ................. $422.95

COM-ACB-80-A Hybrid Phased Array Four-Square System, 80M ................... $412.95

COM-ACB-40-A Hybrid Phased Array Four-Square System, 40M ................... $402.95

COM-ACB-30-A Hybrid Phased Array Four-Square System, 30M ................... $392.95

COM-ACB-20-A Hybrid Phased Array Four-Square System, 20M ................... $392.95

COM-ACB-15-A Hybrid Phased Array Four-Square System, 15M ................... $392.95

COM-ACB-10-A Hybrid Phased Array Four-Square System, 10M ................... $392.95

Stack 2 Systems

Designed for tri-band, log periodic or

monoband Yagi antennas covering the

40 to 10 meter bands, the Stack 2 Yagi

Switch Relay Unit lets you select from

two antennas, either individually or

simultaneously. This allows you to choose

the best vertical radiation angle for the band conditions. It handles

3,000 watts and features reliable Potter and Brumfield relays.

The perfect compliment to your Stack 2 Yagi Switch Relay Unit, the Stack 2

Switch Control Console integrates seamlessly with both old and new COMTEK Stack 2

Systems. It runs on 12 Vdc at 1A and includes a power cable.

You can save money by purchasing both components together in a single system. The

only other items you’ll need to complete your installation are the three-conductor

control cable and 2 equal lengths of 50 Ω coax cable.

COM-STACK-2 Stack 2 Yagi Switch Relay Unit ............................................... $226.95

COM-STK2A Stack 2 Yagi Switch Control Console ..................................... $125.95

COM-STACK-2-A Stack 2 Yagi Switch System with Console and Relay Unit ... $294.95

Stack 3 Systems

Building upon the success of the Stack 2 System,

COMTEK o ers you even more selectivity,

giving you a broader range of signal arrival and

transmission angles. The Yagi Array Switch

Relay Unit lets you choose from any single (or

combination of) three Yagi Beam Antennas. You can

also use it to match and switch a 3-monoband Yagi

stacked array for any HF band, covering 40, 30, 20, 17, 15, 12 and 10 meters.

To operate the Stack 3 Yagi Array Switch, use a COMTEK Yagi Switch Control Console.

This unit helps you select each antenna individually or in any combination of your other

two antennas. Indicator lights are intuitive and the controls are user-friendly; the unit

works on 110 Vac.

The Switch Unit and Control Console are also available together in an economical

package. You just need to add your frequency-specific impedance-matching coax and

control cable.

COM-STACK-3 Stack 3 Yagi Switch Relay Unit ............................................... $299.95

COM-STACK3-1 Stack 3 Yagi Switch Control Console ..................................... $125.95

COM-STACK-3-1 Stack 3 Yagi Switch System with Console and Relay Unit ... $399.95

Orders by 10 pm ET Ship Same Day, See 58 for Details

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CUSHCRAFT MA160V Spécifications Page 2

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