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The Stowaway Yagi Antenna
An antenna design based on the Yagi-Uda design
principle gives significant forward RF gain over a designated frequency range with significant side and rear rejection as well.
Our design
has about 9dB of RF gain over about a 24 MHz bandwidth. In addition several other important antenna parameters
were optimized for best performance. The
impedance, in this case 50 ohms, and the SWR, Standing Wave Ratio, over the
designed frequency range were also optimized.
The receiver and transmitters used in the location sound industry are designed to feed, or be fed by, 50 ohm antennas. The greater the deviation from this 50 ohm impedance the less power is transferred. The SWR should be as close to a 1:1 ratio as possible. The more the SWR deviates from 1:1 the less power is transferred. This applies equally to transmitter and to receiver antennas.
Our antenna
comes with a female BNC connector so you may choose the length of 50 ohm coax
that best suits your needs. Excess cable
length only serves to attenuate the RF signal you have worked so hard to obtain
in the first place. In addition our
antenna comes with a non-metallic standoff so as to keep the effects of a metal
mast to a minimum. The standoff has a
3/8-16 standard female thread in the bottom for mounting purposes, or it may be
clamped to a C stand. The standoff may
be fixed to the antenna in either a vertically or horizontally polarized
configuration. Note: When using two antennas we recommend one be vertically
polarized and one be horizontally polarized.
The usual design
of a Yagi antenna results in a longish antenna.
More gain equals more length. The
difficulty of this is stowage. It don’t
fit nicely nowhere. To solve this
problem our design allows the boom to be decoupled in the middle. Just a straight, stout, pull and the front
half of the boom is removed for stowage.
Total length is now about a foot.
It goes back together just as easily and is keyed for automatic correct
orientation.
And when 9
dB is not enough, our Yagi can accommodate an extension increasing the total gain
to about 15 dB. This will also increase
the rear rejection, as well. The
vertical and horizontal acceptance angles will also decrease.
The Stowaway Yagi Specifications
Gain: Approximately 9 dB
Bandwidth: Approximately
24 MHz
Impedance: 50 Ohms
SWR, Standing Wave Ratio:
Better than 1.25:1 over the specified frequency range.
Acceptance Angle: 23
degrees above and below the axis of the mast.
Stated another way, about 45 degrees horizontal and about 45 degrees
vertical.
Physical Dimensions in inches: Approximately 20.5 long X 11 wide X 2 ¾ high assembled,
without the standoff. !2 long X 11 wide
X 2 high, disassembled for stowage. The length and width vary with the chosen frequency.
Weight: Approximately
1 lb Antenna response measurements were made with a 6 foot length of RG 58 cable connecting the antenna to the test equipment.
Selecting your frequency:
When selecting the antenna frequency for your specific wireless application, please select from the options below and we will calculate a center frequency for your antenna that will cover the block in which you are operating your wireless system. For example, if you select (Lectrosonics) Block 26, frequency 665.600 MHz to 691.100 MHz, then the center frequency for your antenna would be calculated at 678.350 MHz and would be the appropriate configuration for Block 26.
Custom center frequencies may also be ordered at no additional charge. Please contact us for custom frequency plans.
NOTE: You may select from only one frequency block for each antenna ordered!
... and it's made in the USA!
| Available Options: |
| Frequency Block |
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