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Harsh Electronics offers an assortment of directional and omni directional
antennas. While there are many factors to consider in making an antenna decision
there are 3 in escapable truths:
Height is everything.
The radio will only perform as well as the antenna and cable connected to it.
Height is everything.
FreeWave and Digi spread spectrum radios using only a 3" long unity gain whip
antenna have a line-of-sight range of about 20 miles. Using external antennas
will improve their performance considerably. In general, Yagi antennas should be
used for longer point-to-point links and omnis for shorter links or for repeater
sites. However these are simply guidelines. With proper placement the type of
antenna becomes secondary. As an example we know of installations where Yagis
are used for repeaters, with a 10 mile link coming into the back or side of the
antenna.
Harsh Electronics offers the following antennas. Note: the
omni-directional antennas maybe used with either brackets or magnetic mounts.
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Model |
Range |
Type |
Dir. |
Gain |
Conn. |
Dim. |
Notes |
|
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EAN0900NR |
900 MHz |
Whip,1/2 wave |
No |
|
N-type Male |
8" Tall |
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EAN0900RQ |
900 MHz |
Whip,1/4 wave |
No |
|
Reverse SMA |
3" Tall |
|
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EAN0900SR |
900 MHz |
Whip,1/2 wave |
No |
|
SMA |
7" Tall |
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EAN0900SQ |
900 MHz |
Whip,1/4 wave |
No |
|
SMA |
3" Tall |
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EAN0900WB |
900 MHz |
High gain |
No |
3 dB |
NMO |
12" Tall |
Donut pattern, open Coil
Includes brackets. |
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EAN0900WR |
900 MHz |
Whip |
No |
|
screw |
|
Replacement for DGR-115 |
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EAN0900YC |
900 MHz |
Yagi |
Yes |
10 dB |
N-type fem |
24" Long |
7-element; Bluewave;
50 °H / 45 °V Beamwidth.
125 MPH rated wind velocity. |
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EAN0905WB |
900 MHz |
High gain |
No |
5 dB |
NMO |
33" Tall |
Elevated feed antenna.
No ground plane required.
Includes brackets. |
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EAN0906YA |
900 MHz |
Yagi |
Yes |
6 dB |
N-type fem |
15" Long |
3-element; Mobile Mark;
100 °H / 60 °V Beamwidth.
100 MPH windload. |
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EAN0906WB |
900 MHz |
High Gain |
No |
6 dB |
N-type fem |
65" Long |
Fiberglass; Antenex;
Includes brackets. |
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EAN2400NR |
2.4 GHz |
Whip,1/2 wave |
No |
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N-type Male |
5" Tall |
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EAN2405WC |
2.4 GHz |
Whip |
No |
5 dB |
NMO |
4.5" Tall |
Donut Pattern, no ground plane required |
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EAN2414CR |
2.4 GHz |
Corner reflector |
Yes |
14 dB |
N-type fem |
7" Tall 5" Deep |
44 °H / 35 °V Beamwidth |
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We also can provide omni directional antennas with a horizontal
polarization. Horizontal polarization may be very useful when one of the
radios in a link is co-located near a page or cell phone tower, by
effectively lowering the overall noise floor by upto 20 dB. When using Yagi
antennas, this is accomplished by turning both antennas in the link so their
elements are horizontal. Out-of-band noise may also be reduced with the use
of a band pass filter.
NOTE: use of proper cable assembly is very important! |
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