COLINEAR OMNI-DIRECTIONAL ANTENNA, PACKS AS MUCH GAIN AS 2 DIPOLES
SHIPPING FROM EU!
Looking for a solution giving gain similar to 2 bay vertical dipoles with perfect omnidirectional coverage and have some space available at the top of a roof or a tower? Than this is the antenna for you. 2-dipoles mounted at the side of the tower will not give perfect omni-directional coverage; this antenna at the top of a tower will. Produced to exacting
standards using state of the art electrical and mechanical designs resulting
in superior performance and long service life.
There are several similar designs out there, all based on the old SIRIO design. Most of those use very poor gamma match from the CB-radio version which blows very fast. Those also use cheap plastic connectors. Pretty much all of them use low-cost cast heads. Ours is the only version which comes with high-grade CNC machined head. Check the photos.
When measured against a standard 1/2 wave dipole the Exterminatorｮ delivers
a massive 5.15 dBi gain across the entire FM Band. All RF connectors are teflon
components with specifications that exceed required ratings. Antenna arrives fully tuned and assembled the Exterminator can be installed on your
tower or mast in a matter of minutes.
Remember to write your desired frequency during check-out under comments, we will tune your antenna for you. You can always tune your
antenna alone with SWR meter and instructions. Note that although antenna is tuned at the factory it is sometimes necessary to make a small adjustment depending on for example nearby objects etc. Some parts may also move slightly during shipping so remember to re-tighten all screws. Antenna ships in fully assembled form, but the two sections are collapsed for easy transport. You will only have to release two screws and extend the two telescopic sections all the way to the two black marker circles, than fix the screws again.
- Perfectly circular coverage when mounted on top of a tower/pole.
- Matches or outperforms 2 dipoles
- Easier to mount than 2 dipoles
- Not wideband, requires tuning (we do this for you)
- NOT SUITABLE for people who don't know how to operate SWR meter or perform simple antenna tuning (take wideband dipoles or systems instead please)
- Frequency range: 87.5 - 108 MHz (check our website for VHF TV version)
- Max power rating: 900-1000W (N), 3KW (7/16) - 4kW (EIA)
- Impedance: 50Ω unbalanced
- Gain: 5.15 dbi (Upgrades 1KW tx into 2KW ERP tx)
- Radiation (H-plane): 360ｰ omni directional
- Polarization: Vertical
- Connector: "N" - 7/16" DIN - EIA
- 6MHz Bandwidth at S.W.R. 2:1:
- S.W.R. at res. freq.: ≤ 1.5:1
- Feed system: Gamma match
- Tuning: Arrives pretuned (retuning by length adjustment and gamma match adjustment)
- Materials: Aluminum, Teflon, Copper
- Wind load / resistance: 305 N at 250 Km/h
- Wind surface: 0.28 m2
- Height (approx.): 3,5m (depending on frequency)
- Weight (approx.): 5,5Kg
- Mounting mast: 60-75mm
Although antenna comes pre-tuned it is recommended that you re-check the SWR before putting antenna into service, nearby objects can slightly de-tune the antenna!
1. If you received your antenna pretuned extend the two telescopic sections until the two black marker rings show.
If you are retuning to another frequency extend the antenna as shown below (loosen screws and extend the 2 telescopic parts).
If tuning for around 88MHz: Extend fully
If tuning for around 100MHz: Extend 50%
If tuning for around 108MHz: Extend about 25%
2. Mount the bottom part of the antenna to the intended metal pole and tighten with screws firmly
3. If you received antenna pretuned, do not loosen gamma rod.
If this is a new untuned antenna or if you are re-tuning loosen the gamma strap so that the gamma rod can move in and out
with a bit of effort. Now set the rod so that it is about 1/3 in the black gamma match tube.
4. Connect RigExpert SWR analyzer (AA-170 or better), power it up, press 4 for SWR measurement. (read the PS below if you do not own one).
5. Move center frequency to frequency of choice (use Freq - and Freq + buttons), set range to about 20MHz for a start,
you can reduce range later when you get close to the frequency of choice.
6. Press OK to start measurement. The curve minimum needs to be close to zero at the desired Frequency.
7. Change the length of the antenna until you get best SWR at desired frequency.
8. Change gamma rod position until you get best SWR at desired frequency.
9. Repeat 7 and 8 until you get minimal SWR reading possible.
10. Tighten all screws
11. Check SWR again. If needed, correct.
12. You're done!
PS: If you don't have antenna analyser feel free to use SWR meter as well, however do this at minimal power that still makes it possible to get a decent reading out of your SWR meter and at the same time does not endanger the output stage of your transmitter. Never read SWR off the LCD display of your transmitter, USE A REAL SWR meter or antenna analyser.