DIAMOND W-719 Dual Band Wire Dipole Trap Dipole Antenna Instruction Manual

DIAMOND W-719 Dual Band Wire Dipole Trap Dipole Antenna

OPERATION INSTRUCTIONS
Keep this manual carefully, hand or a ties uctions thoroughly before using it.

Safety Precautions

Note beforehand that the company shall not be liable for any damages suffered by the customers or third parties in using that product, or for any failures and faults that occur in the use or misuse of this product, unless otherwise provided for under the law.

• Type and meaning of the marks

DANGER

• Don’t install the antenna on a rainy or windy day since it is dangerous.
• Don’t touch the antenna during transmission since it is dangerous.
• If there is a thunderstorm during operation, stop the operation immediately and remove the cable from the transceiver. If that doesn’t make it in time, don’t touch the antenna and the cable. It may be severely injured or die due to getting an electronic shock from a lightning strike.

WARNING

• Don’t drop the antenna, tools, and attachment when installing the antenna at the height. Install the antenna after assembling it on the ground.
• Install the antenna firmly so as not to fall due to the strong wind. Even if falling down the antenna, locate the antenna at a safe place where people and buildings are not inflicted injuries.
• Don’t attempt to install the antenna only by yourself. Installing the antenna alone on the roof may lead you dangerous accidents. Always ask your friends for help installing the antenna.

CAUTION

• Make sure to adjust the antenna before using it.
• Install the antenna as far away as possible from any obstacles to obtain its maximum performance.
• Keeping transmitting with high VSWR may cause the transceiver to be damaged. Stop transmitting immediately and check the antenna.
• When transmitting, operate within the specification of the transmission power. It is a big burden on the antenna on FT8 etc. Don’t operate over the specification of the transmission power. The antenna may be damaged.

Description

1. The W719 can be operated on 1.9MHz(160m) and 7MHz(40m).
2. 7MHz is 1/2 wave and 1.9MHz is high efficiency.
3. It is easy to assemble.
4. It is easy to adjust each frequency by the adjustment elements.
5. The element is applied in AWG 12 IV wire. It is an excellent performance of low expansion and contraction rate, withstand tension and weatherability.
   • Operate FT8 at 250W continuously.

Parts List

Please confirm if all parts of the below list are contained in the package.

• Balun (BU-50A) · · · · · 1
• 1.9MHz Loading Coil · · 2
• Element (J) 4.6m ( l 81. l “) 2
• Element (K) l Om (393. 7″) 2
• Adjustment element 0.4m(l 5.7″) 2
• Insulator · · · · · · · · · · · · 2
• Cremona Rope l0m(393.7″) · · · 1
• Self-melting Plastic Sealing Tape 0.3m(l l .8″) 1
• Binding wire 0.6m(23.6″) 1

Assembly

The antenna is assembled as shown in the figure.

1. Turn the element (K) 20cm(7.9″) through the balun and bind two parts by the binding wire. Cut the binding wire for l 0cm (3.9″).
2. When installing the element to the loading coil, turn the element l 5-l 6cm(5.9″-6.3″) and hock it. Turn the crimping terminal side of the element (Kl four times and fix them with the spring washer and the nut. Do the same at the element (J) side and fix it. (Set the 7MHz adjustment element on the balun side of the loading coil.)
3. Put the element (J) 55cm (21. 7″) through the insulator and tie it as shown in the figure.
4. Connect the coaxial cable to the balun. For waterproofing, wrap the connector with self-melting plastic sealing tape, and wrap it again with the plastic tape. Pull the self-melting plastic sealing tape approx. two times its former length when wrapping.

NOTE

• Since each element is being affixed with its cord, assemble the antenna by referring to the assembled antenna figure.
• Set the adjustment element downward to avoid affecting the resonant frequency of the main element.
• The elements that are connected with both ends of the insulators become the adjustment element which is 50cm(l 9.7″) hanging down. (When adjusting more than  .9MHz, the adjustment element will be more than 50cm(l 9.7″).)
• Tie the insulators with the Cremona rope firmly as shown in the figure.

Installation

There are various ways of installation depending on the place where it is installed.

Note

1. To touch the antenna during transmitting is a risk of electric shock because the tip of the element is a voltage point. Noise may be generated due to the spark at the building etc. Install the tip of the element at more than 2m(78.7″) away from the building.
2. To avoid having a direct load from the coaxial cable, turn the coaxial cable around the balun once and fix it with the plastic tape. If the coaxial cable and the element are parallel, SWR may be higher, or common mode electronic currency may occur and it becomes the reason for the noise. Hang the coaxial cable down against the element vertically. (If common mode occurs, it is recommended to use the CMF2000.)
3. In the case of installing the antenna in trees etc., it is recommended to use the strong or elastic rope at the rope side to avoid breaking the elements by strong wind.
4. The antenna adjustment has to be practiced at the place where the antenna is being operated. It is useful in finding the easy way to do the antenna up and down. The radiation impedance (50.0 is fine) will be changed depending on the height because the horizontal dipole is affected by the ground. Install the antenna at the higher may have the nearly perfect adjustment. However, it depends on the surroundinenvironmentts.

Adjustment

1. Install the antenna without cutting the adjustment element once. Find the resonance point (best SWR) by the SWR meter or the analyzer and take notes. The resonance point at factory adjustment is around 7.0MHz.
2. Put the antenna down after taking the notes of the measurement and adjust the frequency. Start adjustment from higher operation frequency(7MHz). Cut the adjustment elements at both sides at the same length and adjust the desired resonance point (best SWR).
3. Install the antenna again after finishing the adjustment and confirm the resonance point. Adjust it again if there is a difference between the desired frequency and the actual one. If ok, find the resonance point (best SWR) on the l .9MHz band and take notes. The resonance point at factory adjustment is around 1.8MHz.
4. Put the antenna down after taking the notes of the measurement cut the adjustment element for the l .9MHz band and adjust it. The procedure is the same as 2.
5. Install the antennae again after finishing the adjustment and measure the SWR on both 1.9MHz and 7MHz at the last. If no problem, please confirm if the antenna is fixed firmly.

Cut the adjustment elements that are closer to the balun on both sides at the same length.

Note: If cutting the adjustment element too much, solder the element.

Resonance frequency change of the adjustment element
The resonance frequency will be higher if cutting the adjustment elements.

Note
Since the amount of the frequency change by cutting the adjustment element may change more or less depending on the place where the antenna is installed, it is recommended to cut the element a bit shorter for adjustment.

VSWR

Specification

The point when operating new digital mode FTB etc.
Operating new digital mode FTB etc. is a big burden on the antenna and other equipment due to continuous transmission. Operate the max, power rating at less than l /5 of SSBCPEP) on FTB etc.

• Though these products purchased are manufactured under strict quality control, if damage is caused by transporting, ask your dealer promptly.
• Design and specifications of these products will be changed for future improvement without advance notice.

DIAMOND ANTENNA CORPORATION
Miyata Building, No.15-1, 1-chome Sugamo, Toshima-ku Tokyo, Japan 170-0002 Phone. +81-3-3947-1411 FAX. +81-3-3944-2981

• Website   https://www.diamond-ant.eo.jp/english/

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