Balun Mounting Bracket for COMTEK Baluns and Wire Antennas

Transcription

1 Balun Mounting Bracket for COMTEK Baluns and Wire Antennas Patent Pending DXE-WA-BMB DXE-WA-BMB-INS Rev 0b Shown with optional parts DX Engineering 2017 DX Engineering Southeast Ave. - Tallmadge, OH USA Phone: (800) Tech Support and International: (330) Fax: (330) DXEngineering@DXEngineering.com

2 Introduction and General Information This custom made patented pending Balun Mounting Bracket for top terminal COMTEK Baluns and Wire Antennas kit includes two DX Engineering End Insulators (US Patent No. D534,905) and all Stainless Steel Hardware. Using the optional coaxial cable strain relief (DXE-CSR213-1 for RG- 213 sized coax or the DXE-CSR8X-1 for RG-8X sized coax) with your optional dipole wire (DXE-ANTW Antenna Wire) and DX Engineering rope, this kit is the ideal starting point for building a quality coaxial cable fed single band resonant dipole, folded dipole or off-center fed dipole. The custom made mounting bracket will fit other manufacturers similarly packaged Baluns. The unique design provides minimum capacitive coupling to the wire and field surrounding the Balun core plus a special UV resistant, strong black plastic compound. The bracket as well as the end insulators feature an exclusive serpentine wire weave grip for insulated DX Engineering Antenna Wire. This method of threading the wire provides a grip strong enough to permanently support the antenna wires without the need for looping or wrapping the wire ends back on to the dipole wires. This allows fast and easy field adjustments of antenna length without soldering. This manual does not cover all the types of resonant dipoles that could be built using these components. The type of resonant dipole to be built is limited only by your imagination. For more complete antenna theory and for construction of the many different types of wire antennas possible, refer to textbook material such as the "ARRL Antenna Book" which is also available from DX Engineering. Features All-in-One mounting bracket (Patent Pending) Custom molded, UV resistant black poly-resin blend Serpentine routing of dipole wires to ensure maximum grip without soldering or other mechanical restraints Includes two DX Engineering End Insulators (US Patent No. D534,905) Easily mount a COMTEK balun with top wing nut terminals Adapts easily to other brand baluns built with the same NEMA mounting box used by COMTEK All Stainless Steel Balun Mounting Hardware Manual Updates Every effort is made to supply the latest manual revision with each product. Occasionally a manual will be updated between the time your DX Engineering product is shipped and when you receive it. Please check the DX Engineering web site ( for the latest revision manual. Page 2

3 Parts List Qty Description 1 Comtek Balun & Wire Antenna Bracket 2 DX Engineering End Insulators x 3/4 long Stainless Steel Hex Head Bolts 8 #6 Stainless Steel Flat Washers Nyloc Hex Nuts Note: The following assembly instructions are based on building a typical resonant dipole for 15 meters. Optional items include a COMTEK balun, DX Engineering Antenna Wire, DX Engineering Coax Strain Relief, DX Engineering Rope, DX Engineering Coaxial Cable, suggested Never- Seez for the stainless steel hardware and DX Engineering weatherproofing materials for coaxial connectors. Additional Items Needed but not Supplied: COMTEK Balun DX Engineering Premium Antenna Wire DX Engineering Coaxial Cable Strain Relief DX Engineering Synthetic Rope DX Engineering Coaxial Cable with PL-259 connectors installed PTX Never-Seez or DXE-NSBT8 Anti-Seize compound - used on the threads of Stainless Steel Hardware to prevent galling (seizing) and aid in proper tightening See the Options page near the end of this manual for complete details about the above items Page 3

4 Antenna Installation Safety Considerations WARNING! INSTALLATION OF ANY ANTENNA NEAR POWER LINES IS DANGEROUS Warning: Do not locate the antenna near overhead power lines or other electric light or power circuits, or where it can come into contact with such circuits. When installing the antenna, take extreme care not to come into contact with such circuits, because they may cause serious injury or death. Overhead Power Line Safety Before you begin working, check carefully for overhead power lines in the area you will be working. Don't assume that wires are telephone or cable lines: check with your electric utility for advice. Although overhead power lines may appear to be insulated, often these coverings are intended only to protect metal wires from weather conditions and may not protect you from electric shock Keep your distance! Remember the 10-foot rule: When carrying and using ladders and other long tools, keep them at least 10 feet away from all overhead lines - including any lines from the power pole to your home. Mounting Considerations When planning the location of your antenna, consideration should be given to the height, location of suitable support structures and feedline positioning and length. Generally speaking, dipole antennas should be mounted as high as possible for best performance. Antenna height will affect the exact resonance point, radiation pattern, and takeoff angle. The higher the antenna, the lower the takeoff angle to the horizon, which increases the effective range of the antenna. For DX, the minimum height above ground should be 1/2 to 1-wavelength at the lowest operating frequency. On the low bands, this height becomes impractical for most hams. For example, an 80m dipole at 70 feet is about 1/4-wavelength above the ground. This antenna would be good for local and short distance communications, but not optimal for DX, due to the high takeoff angle and ground absorption. A 40 Meter dipole at 70 feet is approximately 1/2-wavelength high and is likely to be good for DX and less optimal for local or short range communications. For more information on antenna design, feedline and radiation angles, consult a reliable text such as the "ARRL Antenna Book" which is available from DX Engineering. Page 4

5 Basic Assembly Note: The following assembly instructions are based on building a typical flat top resonant dipole for 15 meters. Optional items include a COMTEK balun, DX Engineering Antenna Wire, DX Engineering Coax Strain Relief, DX Engineering Rope, DX Engineering Coaxial Cable, suggested Never-Seez for the stainless steel hardware and DX Engineering weatherproofing materials for coaxial connectors. Using the included Stainless Steel Hardware, mount the COMTEK balun (in this example we ll use the COMTEK 1:1 Balun - part number COM-BAL-41130T) as shown below. Note: When installing stainless steel hardware, it is suggested that PTX-81343, 81464, DXE-NSBT8, NMBT8 - Never-Seez or Anti-Seize be used to prevent thread galling. Mount the Balun on the side opposite the cupped areas of the dipole wire guides. Page 5

6 When building a single band coaxial cable fed HF dipole antenna, you may easily use the formula L = 468/F to determine the overall length of the wire (L in feet, F in MHz). The formula takes into account the end-effect of the antenna wire to give you the overall length of the wire portion. As an example, using the formula L = 468/F, the overall length of a half wave dipole for MHz would be L = 468/3.800 or feet. Cut the overall length of the wire to 125 feet or more to include the extra length for tuning, then cut that in half to provide two dipole legs each 62.5 feet long. Use this theoretical formula length as a starting point to cut the wire, leaving about one foot extra on each dipole leg for wire fastening and fine tuning adjustment to allow for anomalies and environmental effects in your particular installation. Longer length dipole legs may be required for Inverted-V antennas. Both of the dipole leg ends should be measured and cut longer than necessary so you have enough wire to wrap around the Balun terminals and End Insulators, plus a little extra for final tuning. It s always easier to cut excess wire rather than having to solder on extra wire when tuning. In this example, we are making a 15 meter flat top resonant dipole. The lowest frequency on the 15 meter band is MHz. Example: MHz (bottom edge of 15 meters) Overall Length = feet Leg 1 = feet Leg 2 = feet Overall length would be BUT we add some extra for wire fastening and tuning Therefore; cut the legs to 13 feet each Longer length dipole legs (up to 2 feet longer) may be required for Inverted-V antennas. Page 6

7 Trim approximately 1 inch of insulation from the two dipole wires that will connect to the COMTEK Balun. Route the dipole wire ends through the mounting bracket in a serpentine manner as shown below. Note where the wire enters the bracket through the cupped area. Loosen the connection hardware on the COMTEK balun. Wrap one of the the trimmed dipole wire ends around the balun connection point between the flat washers in a clockwise direction. Don not include insulation, just have bare wire under the washers. Firmly tighten the balun mounting hardware wing nut. Repeat this for the other wire and balun terminal. Page 7

8 Install the optional DX Engineering Coaxial Cable Strain Relief - either the DXE-CSR213-1 or the DXE-CSR8X-1 depending on the type of coaxial cable used. In our example we are using the DXE-CSR8X-1 Cable Strain Relief to be used with the DXE-8X coaxial cable. Refer to the detailed instructions that are included with the strain relief for details on the assembly. Connect the coaxial cable (in this example DX Engineering DX-8X with PL-259s attached) to the bottom of the Balun. This coaxial connection should be weather proofed using the DX Engineering TES-2155 Temflex TM Rubber Splicing Tape with an overwrap of TES Scotch Super33+ tape for a complete weatherproof solution. Detailed information on weatherproofing connectors is available on-line at Page 8

9 Dipole Wires and End Insulators The End Insulators are installed at the far ends of the dipole wires. One on each end. Route the dipole wire in a serpentine manner as shown below. Note the wire enters the End Insulator at the cupped area. Once tuning is completed at low power, and the dipole leg wires are trimmed to length you can add an extra tuck in the wire end to provide even more gripping power on the dipole wires as shown below. Wrapping and soldering is not required. Attaching Rope to the End Insulators DX Engineering Double-braided Polyester Rope SYN-DBR should be secured to the Balun Mounting Bracket and the End Insulators (depending on your installation) using a non-slip knot. The rope hole (diameter) on the Balun Mounting Bracket is 0.371" and the end insulators are 0.34". One suggestion for attaching the rope to the End Insulators is shown below. The ends of the rope should be cauterized with a small flame to prevent the rope braid from fraying. Non-Slip Knot using SYN-DBR Double-braided Polyester Rope Page 9

10 Support Line The Balun Mounting Bracket s top hole is used for the attachment of a support line (also referred to as a messenger line) that is used to provide support for the antenna wire and feedline. The use of the messenger line, which is strongly recommended, will reduce the stress on the element wires and keep the antenna from stretching over time, which will change its resonant frequency. When using trees for support, you may want to use counter weights that will allow the rope to move when the trees sway in the breeze to avoid stretching or breaking your dipole. For more hints, consult a reliable text such as the "ARRL Antenna Book" which is available from DX Engineering. Ideally, the messenger line should attach to the same structure used for the dipole, only above it, forming at least a 30 degree angle between the dipole and the messenger line to support the antenna as shown below. Flat Dipole Installation between trees using a Messenger Line DX Engineering Double-braided Polyester Rope SYN-DBR is used for the messenger line by forming a loop at the mid-point of the rope. Push the loop through the Center-T top hole, and pull the rest of the rope through the loop.. Rope Loop for Messenger Line The excess rope can be used to attach the antenna end insulators to the support structures. Use the same structures used by the messenger line if possible. The ends of the rope should be cauterized with a small flame to prevent the rope braid from fraying. Page 10

11 The top support hole may also be used for rope to install it as an inverted-v. Inverted-V Dipole Tower Side Arm Installation Tower side arm Universal Mounting Plates and Saddle Clamps are available from DX Engineering. Tuning Once the dipole is completed, raise the dipole to its operating position. Attached an Analyzer (example: Rig Expert REU-AA-54) and determine the resonant point on the dipole. It will probably be a bit lower than you want - this is good. You then need to trim a small piece from each end of the dipole (about 1 inch) and re-measure. If the resonant point is low - trim the overall length shorter If the resonant point is too high, you have to add to the overall length. Once tuned, you are ready to get in the air and make contacts. Page 11

12 Optional Items COMTEK Baluns COMTEK Jerry Sevick W2FMI Series Current Baluns were inspired by the writing of Jerry Sevick, as published in his book "Understanding, Building, and Using Baluns and Ununs", also available from DX Engineering. COMTEK baluns are value-engineered to provide maximum performance at minimum cost, while providing a superb, efficient match between unbalanced coax and balanced antennas. COMTEK Baluns feature: * Jerry Sevick design with modern improvements from DX Engineering's in-depth balun research and development * Unique high-voltage compensating capacitors for unequaled SWR bandwidth * Outstanding ferrite mix coated toroid core with special design to accommodate close coupling without excessive stress * Exceptionally high and consistent common mode impedance across the specified band, which provides isolation where it is needed most * Special wire size selection and Teflon-insulated wire sleeves provide exact impedance matching and superb insulation, unlike common Thermaleze wire * Typical insertion loss is less than 0.2 db * Power handling from 3 kw continuous to 7 kw intermittent, depending on model * May be used to 54 MHz with reduced ratings * Gasketed SO-239 connectors are silver plated and have Teflon insulation * Sealed in a weatherproof 4 in. x 4 in. x 2 in. NEMA box * Stainless steel hardware Part Number Ratio Cores Max Rating Wrap COM-BAL-11150DT 1:1 2 5 kw cont. Coax COM-BAL-11150T 1:1 1 3 kw cont. Coax COM-BAL-41130T 4:1 1 3 kw cont. Wire COM-BAL-41150T 4:1 2 5 kw cont. Wire DX Engineering Cable Strain Relief Kits DX Engineering Cable Strain Relief Kits are designed to be used with DX Engineering and COMTEK Baluns. Offered with two cable clamp sizes to cover most popular sizes of coaxial cables, they may be used in many other applications with only a single point of suspension necessary. Long runs of coaxial cable are heavy, and if they are not properly restrained, the weight of the cable can cause a failure in your feedline connection. In some cases, the cable can pull completely out of a PL-259 connector. The DXE Cable Strain Relief Kits are designed with corrosion-resistant aluminum and use stainless steel hardware. These kits are very durable and will ensure that the cable stays connected, to keep you on the air. Part Number DXE-CSR213-1 DXE-CSR8X-1 Description Cable Strain Relief for RG-213 sized coaxial cable Cable Strain Relief for RG-8X sized coaxial cable DX Engineering Antenna Wire DX Engineering Antenna Wire will help your achieve top performance and long, trouble-free operation. This relaxed PVC-insulated 14 AWG stranded copper wire is UV resistant and rolls out easily, unlike wire that is commonly available at big-box stores, which coils and kinks. DX Engineering Antenna Wire will last much longer when exposed to the elements as compared to bare wire. Part Number DXE-ANTW-1000 DXE-ANTW-500 DXE-ANTW-300 DXE-ANTW-150 DXE-ANTW-75 Description Antenna Wire foot spool Antenna Wire foot spool Antenna Wire feet Antenna Wire feet Antenna Wire - 75 feet Page 12

13 DX Engineering Antenna Support Rope Synthetic Textile Industries Antenna Support Rope is the premium double-braided Dacron/polyester rope that Amateurs and SWLs have been using for years. Available in several sizes and spool lengths, this superior antenna support rope is not weakened by decay or mildew and provides excellent resistance to abrasion. The color sealed black polyester yarn used in the braided jacket also protects the cord from damage due to ultra-violet light. Part Number SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR SYN-DBR Description Antenna Support Rope in., 100 ft., 260 lb. break strength Antenna Support Rope in., 1000 ft., 260 lb. break strength Antenna Support Rope in., 100 ft., 420 lb. break strength Antenna Support Rope in., 1000 ft., 420 lb. break strength Antenna Support Rope in., 100 ft., 770 lb. break strength Antenna Support Rope in., 350 ft., 770 lb. break strength Antenna Support Rope in., 500 ft., 770 lb. break strength Antenna Support Rope in., 100 ft., 1790 lb. break strength Antenna Support Rope in., 500 ft., 1790 lb. break strength Antenna Support Rope in., 500 ft., 2150 lb. break strength DX Engineering 400MAX Low-Loss 50 ohm Coaxial Cable DXE-400MAX DXE-400MAX - Bulk Cable - No Connectors - Sold by the foot DXE-400MAX-500 DXE-400MAX - Bulk Cable - No Connectors foot length DXE-400MAX Low-Loss Cable DXE-400MAXDX003 DXE-400MAX Cable - PL-259 each end, Tested, 3 foot length DXE-400MAXDX006 DXE-400MAX Cable - PL-259 each end, Tested, 6 foot length DXE-400MAXDX009 DXE-400MAX Cable - PL-259 each end, Tested, 9 foot length DXE-400MAXDX012 DXE-400MAX Cable - PL-259 each end, Tested, 12 foot length DXE-400MAXDX018 DXE-400MAX Cable - PL-259 each end, Tested, 18 foot length DXE-400MAXDX025 DXE-400MAX Cable - PL-259 each end, Tested, 25 foot length DXE-400MAXDX050 DXE-400MAX Cable - PL-259 each end, Tested, 50 foot length DXE-400MAXDX075 DXE-400MAX Cable - PL-259 each end, Tested, 75 foot length DXE-400MAXDX100 DXE-400MAX Cable - PL-259 each end, Tested, 100 foot length DXE-400MAXDX125 DXE-400MAX Cable - PL-259 each end, Tested, 125 foot length Gas-Injected Foam Won t Absorb Water DXE-400MAXDX150 DXE-400MAX Cable - PL-259 each end, Tested, 150 foot length Low-loss, gas-injected foam polyethylene DXE-400MAXDX175 DXE-400MAX Cable - PL-259 each end, Tested, 175 foot length DXE-400MAXDX200 DXE-400MAX Cable - PL-259 each end, Tested, 200 foot length DX Engineering 400MAX is premium, low-loss, 50 ohm bulk cable with a special Type III-A, UV-resistant polyethylene jacket that is ideal for outdoor applications, particularly direct-bury. With its larger 10 AWG stranded copper center conductor, 400MAX is specially suited for high-power amateur stations, providing a lower loss solution for long cable runs at any power level. The high-quality construction continues with a gasinjected foam polyethylene dielectric, followed by the highest level of shielding from bonded aluminum tape covered by a tinned copper shield braid. DX Engineering 400MAX Low-Loss 50 ohm Bulk Coaxial Cable uses crimp PL-259 or N connectors. dielectric bonded tape foil covered by a braided copper shield.405 low-density polyethylene jacket is UV resistant, ideal for outdoor use Direct bury Attenuation/ 100 ft. Power Rating Efficiency % MHz 6.9 kw 93 % MHz 4.8 kw 90 % MHz 2.8 kw 83 % MHz 2.1 kw 79 % MHz 1.2 kw 65 % MHz 0.7 kw 47 % Velocity Factor: 84% (0.84) Minimum Bend Radius: 6 Repeated Bends 2.5 Fixed Install Page 13

14 DX Engineering RG-213/U MIL-Spec 50 ohm Coaxial Cable 213U DXE-213U DXE Bulk Cable - No Connectors - Sold by the foot DXE-213U MIL-Spec Cable DXE-213U-500 DXE Bulk Cable - No Connectors foot length DXE-213UDX003 DXE-213 Cable - PL-259 each end, Tested, 3 foot length DXE-213UDX006 DXE-213 Cable - PL-259 each end, Tested, 6 foot length DXE-213UDX012 DXE-213 Cable - PL-259 each end, Tested, 12 foot length DXE-213UDX018 DXE-213 Cable - PL-259 each end, Tested, 18 foot length DXE-213UDX025 DXE-213 Cable - PL-259 each end, Tested, 25 foot length DXE-213UDX050 DXE-213 Cable - PL-259 each end, Tested, 50 foot length DXE-213UDX075 DXE-213 Cable - PL-259 each end, Tested, 75 foot length DXE-213UDX100 DXE-213 Cable - PL-259 each end, Tested, 100 foot length Solid Dielectric Won t Absorb Water DXE-213UDX125 DXE-213 Cable - PL-259 each end, Tested, 125 foot length Solid Polyethylene Dielectric DXE-213UDX150 DXE-213 Cable - PL-259 each end, Tested, 150 foot length DXE-213UDX175 DXE-213 Cable - PL-259 each end, Tested, 175 foot length DXE-213UDX200 DXE-213 Cable - PL-259 each end, Tested, 200 foot length DX Engineering RG-213/U is a low-loss, 50 ohm, MIL-spec bulk coaxial cable with a noncontaminating Type II PVC jacket. Specially manufactured for DX Engineering, RG-213/U cable is perfect for outdoor use due to its excellent UV resistance and durability in direct-bury applications. Specially suited for high-power amateur stations, RG-213/U provides a lower loss solution for long cable runs at any power level. Featuring a solid polyethylene dielectric, DX Engineering RG-213/U uses crimp and standard PL-259 and N connectors normally designed for RG-8 sized cables..405 Type II-A jacket is non-contaminating and UV-resistant, suitable for outdoor use Direct-bury Braided copper shield Direct-bury Attenuation/ 100 ft. Power Rating Efficiency % MHz 4.9 kw 90 % MHz 3.4 kw 87 % MHz 2.0 kw 79 % MHz 1.5 kw 73 % MHz 0.9 kw 57 % Velocity Factor: 66% (0.66) Minimum Bend Radius: 5 DX Engineering 8X Low-Loss 50 ohm Coaxial Cable (RG8-X or Mini-8) DXE-8X DXE-8X - Bulk Cable - No Connectors - Sold by the foot DXE-8X Low-Loss DXE-8X-1000 DXE-8X - Bulk Cable - No Connectors foot length Foam Dielectric Cable (also known as RG-8X or Mini-8) DXE-8XDX1-5 DXE-8X Cable - PL-259 each end, Tested, 1-1/2 foot length DXE-8XDX002 DXE-8X Cable - PL-259 each end, Tested, 2 foot length DXE-8XDX003 DXE-8X Cable - PL-259 each end, Tested, 3 foot length DXE-8XDX006 DXE-8X Cable - PL-259 each end, Tested, 6 foot length DXE-8XDX012 DXE-8X Cable - PL-259 each end, Tested, 12 foot length DXE-8XDX015 DXE-8X Cable - PL-259 each end, Tested, 15 foot length DXE-8XDX018 DXE-8X Cable - PL-259 each end, Tested, 18 foot length DXE-8XDX025 DXE-8X Cable - PL-259 each end, Tested, 25 foot length DXE-8XDX050 DXE-8X Cable - PL-259 each end, Tested, 50 foot length DXE-8XDX075 DXE-8X Cable - PL-259 each end, Tested, 75 foot length Gas-Injected Foam Won t Absorb Water DXE-8XDX100 DXE-8X Cable - PL-259 each end, Tested, 100 foot length Low-loss, gas-injected foam polyethylene DXE-8XDX150 DXE-8X Cable - PL-259 each end, Tested, 150 foot length DX Engineering RG-8X 50 ohm bulk coaxial cable is a low-loss, foam-dielectric, braided shield cable intended for moderate-power HF stations or mobile applications where short runs and flexibility are key factors. Slightly larger than RG-58 cable, DX Engineering RG-8X offers better handling characteristics, good shielding, and low loss. RG-8X uses crimp and standard PL-259 connectors with reducing adapters (sold separately). dielectric Very flexible; ideal for short, in-shack jumper cables.242 Type II jacket is non-contaminating and UV-resistant, suitable for outdoor use Direct-bury Attenuation/ 100 ft. Power Rating Efficiency % MHz 3.0 kw 86 % MHz 2.2 kw 81 % MHz 1.2 kw 69 % MHz 0.9 kw 62 % MHz 0.4 kw 42 % Velocity Factor: 82% (0.82) Minimum Bend Radius: 2.4 Page 14

15 DX Engineering 8U Low-Loss RG-8U 50 ohm Coaxial Cable DXE-8U DXE-8U - Bulk Cable - No Connectors - Sold by the foot DXE-8U Low-Loss DXE-8U-500 DXE-8U - Bulk Cable - No Connectors foot length Foam Dielectric Cable DXE-8UDX002 DXE-8U Cable - PL-259 each end, Tested, 2 foot length DXE-8UDX003 DXE-8U Cable - PL-259 each end, Tested, 30 foot length DXE-8UDX006 DXE-8U Cable - PL-259 each end, Tested, 6 foot length DXE-8UDX009 DXE-8U Cable - PL-259 each end, Tested, 9 foot length DXE-8UDX012 DXE-8U Cable - PL-259 each end, Tested, 12 foot length DXE-8UDX018 DXE-8U Cable - PL-259 each end, Tested, 18 foot length DXE-8UDX025 DXE-8U Cable - PL-259 each end, Tested, 25 foot length DXE-8UDX050 DXE-8U Cable - PL-259 each end, Tested, 50 foot length DXE-8UDX075 DXE-8U Cable - PL-259 each end, Tested, 75 foot length DXE-8UDX100 DXE-8U Cable - PL-259 each end, Tested, 100 foot length Gas-Injected Foam Won t Absorb Water DXE-8UDX125 DXE-8U Cable - PL-259 each end, Tested, 125 foot length DXE-8UDX150 DXE-8U Cable - PL-259 each end, Tested, 150 foot length DXE-8UDX175 DXE-8U Cable - PL-259 each end, Tested, 175 foot length DXE-8UDX200 DXE-8U Cable - PL-259 each end, Tested, 200 foot length Low-loss, gas-injected foam polyethylene dielectric.405 high-flex PVC jacket Low-loss foam dielectric Braided copper shield DX Engineering RG-8/U bulk coaxial cable is a low-loss corrected 50 ohm coaxial cable with a black vinyl jacket and foam polyethylene dielectric. Specially suited for high-power amateur stations, RG-8/U provides a lower loss solution for long cable runs at any power level. High reliability and low loss are key points when considering this cable. DX Engineering RG-8/U uses standard and crimp style PL-259 and N connectors. Attenuation/ 100 ft. Power Rating Efficiency % MHz 5.4 kw 93 % MHz 4.1 kw 90 % MHz 2.2 kw 81 % MHz 1.8 kw 77 % MHz 1.0 kw 60 % Velocity Factor: 81% (0.81) Minimum Bend Radius: 6 Repeated Bends 2.5 Fixed Install PTX-81343, DXE-NSBT8 - Anti-Seize & Never-Seez An anti-seize compound MUST be used on any Stainless Steel nuts, bolts, clamps or other hardware to prevent galling and thread seizure. Any of these products can be used for this purpose. Part Number Description *PTX Anti-Seize, 1 oz. Squeeze Tube *PTX Anti-Seize, 8.5 oz. Aerosol Can *DXE-NSBT8 Never-Seez, 8 oz. Brush Top *DXE-NMBT8 Never-Seez, 8 oz. Brush Top, Marine Grade * These products are limited to domestic UPS Ground shipping only TES M Temflex 2155 Rubber Splicing Tape. Conformable self-fusing rubber electrical insulating tape. It is designed for low voltage electrical insulating and moisture sealing applications. For outdoor use, it should be protected from UV deterioration with an overwrap of TES TES Scotch Super 33+. Highly conformable super stretchy tape for all weather applications. This tape provides flexibility and easy handling for all around performance. It also combines PVC backing with excellent electrical insulating properties to provide primary electrical insulation for splices up to 600V and protective jacketing. Both tape products are available from DX Engineering. Page 15

16 Technical Support If you have questions about this product, or if you experience difficulties during the installation, contact DX Engineering at (330) You can also us at: For best service, please take a few minutes to review this manual before you call. Warranty All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a period of one (1) year from date of shipment. DX Engineering s sole obligation under these warranties shall be to issue credit, repair or replace any item or part thereof which is proved to be other than as warranted; no allowance shall be made for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by DX Engineering. If DX Engineering s products are claimed to be defective in material or workmanship, DX Engineering shall, upon prompt notice thereof, issue shipping instructions for return to DX Engineering (transportation-charges prepaid by Buyer). Every such claim for breach of these warranties shall be deemed to be waived by Buyer unless made in writing. The above warranties shall not extend to any products or parts thereof which have been subjected to any misuse or neglect, damaged by accident, rendered defective by reason of improper installation, damaged from severe weather including floods, or abnormal environmental conditions such as prolonged exposure to corrosives or power surges, or by the performance of repairs or alterations outside of our plant, and shall not apply to any goods or parts thereof furnished by Buyer or acquired from others at Buyer s specifications. In addition, DX Engineering s warranties do not extend to other equipment and parts manufactured by others except to the extent of the original manufacturer s warranty to DX Engineering. The obligations under the foregoing warranties are limited to the precise terms thereof. These warranties provide exclusive remedies, expressly in lieu of all other remedies including claims for special or consequential damages. SELLER NEITHER MAKES NOR ASSUMES ANY OTHER WARRANTY WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NO PERSON IS AUTHORIZED TO ASSUME FOR DX ENGINEERING ANY OBLIGATION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE FOREGOING. DX Engineering 2017 DX Engineering, DXE, DX Engineering, Inc., Hot Rodz, Maxi-Core, DX Engineering THUNDERBOLT, DX Engineering Yagi Mechanical, EZ-BUILD, TELREX, Gorilla Grip Stainless Steel Boom Clamps, Butternut, SkyHawk, SkyLark, SecureMount, OMNI-TILT, RF-PRO-1B, AFHD-4 are trademarks of PDS Electronics, Inc. No license to use or reproduce any of these trademarks or other trademarks is given or implied. All other brands and product names are the trademarks of their respective owners. Specifications subject to change without notice. DX Engineering 1200 Southeast Ave. - Tallmadge, OH USA Phone: (800) Tech Support and International: (330) Fax: (330) DXEngineering@DXEngineering.com Page 16