2 Meter Slot Antenna
Description
Picture 2: measurement setup Operating with a power between 2 and 50W (the factory output of my Icom IC7000), and taking advantage of the contest organized during the summer, when the propagation is good on these upper bands, I was able to perform some QSO in order to characterize my antenna system. The cubical quad antenna lends itself to use at VHF and UHF, and a 2 metre quad or two meter quad is easy to make using a few items that are easy to obtain or may even be available anyway. It should be remembered when considering its use that the quad, when fed at the bottom gives horizontal polarisation. This includes OTA TV antennas, satellite dishes, and fixed wireless internet service antennas. This gives you the perfect opportunity to construct a slot antenna and hide it in plain site. As a practical matter, I live in a very restrictive HOA (not for much longer though, hooray!) and my small antennas escape notice.
Benefits:
- Rugged construction for years of reliable service
- Low noise floor picks up weak signals better than comparable wire or plastic enclosed antennas
- Wide bandwidth, (4+ MHz across the 2 meter band). No need to retune
- Omnidirectional RF radiation pattern is balanced for communicating with stations at or slightly above the horizon line.
- Pretuned and ready to go for the 2 meter amateur radio band
KB9VBR 2 Meter J-Pole Antenna Specifications:
- Constructed out of 1/2 inch copper tubing
- Overall length 69 inches
- radiator 58 inches
- matching stub 19 inches
- Choice of SO-239 or N Female connector is soldered on at the point of lowest SWR
- Omnidirectional radiation pattern
- Gain is about 3dbi or about 2.5dbd compared to a 1/4 wave ground plane
There are literally hundreds of antennas on the market, what makes this antenna any better than some of the higher priced you’ve seen or experienced? The simple answer is that it just plain works great. Dollar for dollar, the KB9VBR J-Pole antenna may be the best value on the amateur radio antenna market.
Dual Band Performance in a single antenna:
Each antenna is individually tested and tuned for optimum performance on their respective bands. The two meter antenna is tuned to 146MHZ (1.2:1 SWR or less at 146MHz), and the SWR is 1.4:1 or less throughout the entire 2 meter band. This antenna also works great as a dual band antenna. The antenna will tune up on 70cm for excellent dual band performance.
Omnidirectional Sector Waveguide SLOT Antenna
C Band 2320MHz
The slotted waveguide has achieved most of its success when used in an omnidirectional role. It is the simplest way to get a real 10dB gain over 360 degrees of beamwidth
The Slotted waveguide antenna is a Horizontally Polarized type antenna, light in weight and weather proof.
3 Tuning screws are placed for tweaking the SWR and can be used to adjust the center frequency of your choice.
Measurement plot return loss Vs. SWR
Antenna is made of aluminum, mast mount of galvanized steel and nuts of stainless steel.
All the 12 slots are milled with high Precision on a CNC milling machine.
This antenna is available for frequencies on your request, please mail your frequency.
PRICE: Download price list page
Type: SL2320 (2300...2400MHZ) Other freq. on request
Antenna is tuned to your specifications and come's with a measurement Plot of our Network Analzyer. (click right picture for example)
| Specifications: | 2300....2400 MHz (13cm) | |
| Gain | 9,3 dB | . |
| Weight | 3,4 kG (7.5 lbs) | |
| Length | 103 cm (3.4 ft) | |
| Max. RF power | 1000 Watts | |
| RF Connector | N-Connector Female | |
| VSWR | 1.0: 1 | |
| Return loss | >30 dB (typ. 34dB) | |
| impedance | 50 ohm | |
| Mast clamp | 48.....54mm | |
| Graphical display [12 KB] H plane type SL2320 over 360 degrees |
How a Slotted Waveguide Antenna Works
This antenna, called A slotted waveguide, is a very low loss transmission line.
It allows to propagate signals to a number of smaller antennas (slots). The signal is coupled into the waveguide with a simple coaxial probe, and as it travels along the guide it traverses the slots.
Each of these slots allows a little of the energy to radiate. The slots are in a linear array pattern. The waveguide antenna transmits almost all of its energy at the horizon, usually exactly where we want it to go. Its exceptional directivity in the elevation plane gives it quite high power gain. Additionally, unlike vertical colinear antennas, the slotted waveguide transmits its energy using HORIZONTAL polarization, the best type for distance transmission !!
| USER PICTURE Slotted waveguide antenna |
2 Meter Skeleton Slot Antenna
2 Meter Slot Cube Antenna Arrl
ON4IY placed a 13cm slotted waveguide antenna at: 2320,975 MHz, QRA JO20kv, 110 mASL.
Beacon call is: ON0KUL/B
More info of this beacon can be found at: ON4IY