Антенны VHF-5T и VHF-5I - новая серия авиационных антенн, специально предназначенных для использования без заземления. Это означает, что их можно устанавливать внутри композитных самолетов и вертолетов. Эти антенны разработаны с использованием новейших инженерных технологий. Лабораторные измерения показывают, чтобы у них гораздо лучшие электрические характеристики, чем у других антенн. Многочисленные отзывы пилотов высокое качество работы этих антенн. Одна антенна выполняет функции трех: радиосвязь, навигация и аварийнфй маяк. Очень хорошо работают также и в металлическом корпусе.
Отличия между моделями: VHF-5T и VHF-5I отличаются друг от друга только способом соединения BNC. Обе антенны полностью идентичны по их электрическим характеристикам.
Крепится внутри фюзеляжа
Используется в композитном фюзеляже
Используется в тканевом фюзеляже
Может быть приклеена, либо прикреплена другим способом к раме или планеру
Маленький вес
Широкий диапазон эксплуатационных температур
Работает без заземления
Не подвержена коррозии
Крепится в любом месте
Максимальная дальность приема с низким VSWR
Предназначена для радиосвязи, для навигации или для аварийного маяка (только частота 121.5)
Гарантированная работа на всю жизнь ВС
FAQ
Q. What cable length is recommended for the antenna ? A. Any length can be used. This antenna is impedance matched to 50 ohms to allow you to use any length required.
Q. Can I use it in the plastic or fiberglass wingtip of a metal airplane ? A. Yes, but the antenna must be as far from the metal wing as possible. We have had limited success with this. Not recommended for the RV series aircraft.
Q. Will the strobes cause interference ? A. It is possible to couple the strobe audio squeal into the VHF radio. Thishappens when the antenna is close (about a foot) to the strobe.
Q. I thought the com antenna has to be vertical to work. A. For maximum sensitivity, this is best. The VHF-5 antenna has a higher gainthan others but still when mounted in the horizontal plane the resultantsensitivity is reduced but useable.
Q. Can I mount the antenna on a metal part of my airframe? A. No ! This antenna works best when separated from all large metal objects.Mounting it on any metal destroys its antenna properties.
Q. Some people have good operation with a ground plane working with their antenna, does this one do the same? A. No, any ground plane will destroy the effectiveness of this antenna.
Q. My fabric airframe is completed, where is the best location for the antenna? A. Mount it on a wood brace in the fuselage behind the cockpit. Fasten one end to a location on the lower part of the fuselage frame corner. Then fasten the other end to the opposite or diagonal part of the inside of the upper framecorner. Fasten the antenna to this installed piece of wood.
Q. Should I be careful of the angles at which I mount this wood? A. No. As long as the antenna is in the same plane as the plane of rotation ofyour propeller, it'll work.
Q. What happens if I mount the antenna on one of my wood stringers on the fuselage? A. The maximum range will always be off to the sides and the minimum range will be ahead and behind you.
Q. What happens if I mount the antenna on my wood spar in the wing? A. The maximum range will always be ahead and behind you and the minimum range will off to the sides.
Q. What if the antenna has to be mounted with a bend to fit in the space I want to use? A. Curving the antenna will fill in those minimum range areas mentioned above at the slight expense of the maximum range.
Q. Can't I have both? A. No, only a fixed amount of energy can be radiated. If you redirect energy tofill in holes in the pattern you must remove some from one part of theradiation pattern to fill in the other.
Q. Why is it so long compared to others? A. This is a dipole which is half wave length long and makes it about twice aslong as quarter wave antennas.
Q. Can this be made shorter ? A. No, it must be used as manufactured. If it is cut to fit, it will be destroyed.
Q. Do I need a 337 ? A. Perhaps. This is between you, your IA, and the local FAA. It mounts insideand so does not alter the airflow, it attaches with adhesive so no holes oralterations are required for the airframe mount, and it is too light weight toaffect weight and balance.
Q. Will this work on my canopy? A. Yes, but keep it as far from the metal frame as practical.
Q. Why do I have to keep it away from metal things? A. Any metal alters the characteristics of the tuning and pattern in unpredictable ways. Each airframe installation is different, so we recommend that you use tape and experiment with locations until you are satisfied with the operation.
Q. Where is a good location in my fiberglass fuselage? A. Put the com antennas on either side in the tail cone, & if the fuselage isn'ttall enough bend the antennas to resemble the letter"C". If you are using two,stagger them on opposite sides and try to have about 24 inches or more in thestagger.
Q. Why haven't I seen this type of antenna previously? A. This design has been in operation since 1981 but in response to consumer demand they are now being produced for the non-metal airframe market.
Newly acquired gyroplane had extremely high radio SWR (15+), poor cable run and tiny ground plane. I had just heard about independent ground antennas and Aircraft Spruce had the best price. The antenna has very good documentation, the 2 wings are flexible composite, very easy to conform to the nosecone curve of the fiberglass tub. I used 4 pieces of 3M VHB double sided tape to mount, one under the center box (balun), and the others as needed. Very secure. The SWR is now ~1.1 at 123.000 and a max of 1.6 at 136.975. Great purchase.
Brian S
05.10.2017
Fit perfect in my aircraft and fixed the antenna mounting issue I had for my ELT.
Aaron M
24.04.2017
Installed inside the aft fuselage of a Glasair 1TD. I previously had a standard Comm antenna with faux ground plane - lots of dead spots poor transciever performance. The VHF-5T solved ALL of those problems. Great reception, my transmissions are very clear and able to receive from any angle. GREAT antenna!
David T
16.08.2013
I installed the 5T comm antenna and the L2 transponder antenna inside the tail and fuselage during construction of my fiberglass Jabiru J230. My radio and Mode C transponder both work perfectly. Also, there are no ground planes to install and the antennas are hidden inside.
Tom
04.11.2019
I did not want antennas on the outside of my WWI airplane so chose to put this on the inside. I havenâ??t completed the plane or installed the radios yet, but it looks like this is going to work very well.
Ответ:The best route is to look at the FAQ tab on this page as the manufacture has answered a lot of these questions. This antenna is a non TSO'd. It is critical that it is mounted on a non metal surface.
Ответ:Per the manufacture, this antenna is designed for wood & fabric and composite aircraft like carbon fiber. Please refer to the FAQ tab on our page for more info on mounting.
