Raymarine V300 Informations techniques Page 39
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Noté. / 5. Basé sur avis des utilisateurs
191
Antennas
What boat? In choosing an antenna for your boat, the rst consideration is the boat itself, as well as what type of boating you do with it. If yours is
a simple shing boat that would be dwarfed by a 23-foot antenna, then of course the longer, better, higher-gain antennas are out of the question.
If yours is one of the luxurious boats with the multiple decks, then that 23-footer might not even do. Remember, though, that the important
consideration is not just the size of the boat, but what you do with it. If you never take your 90-footer out of Lake Fishbitten, then you don’t need a
huge antenna, after all. And it’s not likely that you’ll take your bass boat Pacic island hopping.
What kind of boating do you do? How much range do you really need from your radio? The farther you venture from shore the longer reach you’ll
need from your radio - and thus from your antenna - to communicate with base stations like the Coast Guard. The farther out you go, the farther you
have to reach to communicate with other boats, too. If yours is a shing vessel, and you need to communicate with others in your eet who are some
distance away, you’ll need a large antenna, high up. For VHF, output power is limited to 25 watts. So, the antenna has to “reach” with its antenna
gain, a function of antenna height, length, and quality.
Antenna Gain Shakespeare’s VHF antennas come in gain categories, like 3dB, 9dB, etc. This is a measure of how efcient the antenna is with the
signal you feed it, but it depends a great deal on the length of the antenna. The gain of an antenna is stated in decibels (dB) of effective radiated
power. Gain is an increase (or even a decrease) in ERP. You do not get antenna gain from any so-called ampliers built into the antenna, and it does
not mean you can put more than the maximum legal 25 watts into a VHF antenna. You only get dB gain from longer, more efcient antennas. High
gain factors are 6dB, 9dB, and thereabouts. Unity means no antenna gain - a multiplier of “one.”
Shakespeare Antenna Considerations
Shakespeare The Stowaway Emergency
VHF Flex Antenna 1/4 Wave Whip
Comes packed in a 12” weather-resistant,
plastic tube which can “stow away” in an
easy-to-reach location for instant emergency
capability if your main antenna becomes
broken or disabled. Complete with 12’ cable,
connector, and rubber suction cup for fast,
easy mounting to any smooth horizontal
surface.
lele nyl oter oern
10” overall length
Velcro strips for storage included
SHA 5911
Shakespeare 36" Low Prole End-Fed
1/2 Wave VHF Antennas
he erfet hoe for ss ots entre onsole shn
boats, or any vessel where compact size is most important.
Comes with a standard-duty stainless steel whip. Chrome
plated brass canister minimizes de-tuning.
Sealed, tin-plated copper wirecoil
eres ont wth entre hole for sse of the
supplied 15’ RG-58 cable. PL-259 connector included
Stainless steel whip
SHA 5240-R Standard whip
SHA 5241-R Heavy duty whip
Shakespeare 36" Stainless Steel Skinny Mini
VHF Antenna
This compact, lightweight antenna is ideal for vessels where space
s lte ss ots n shn essels for ele ts hroe
plated brass canister minimizes de-tuning. Cable and PL-259
connector included.
VHF marine band 3dB
3 foot stainless steel whip
Sealed, tin-plated copper wire coil
eres ont wth entre hole for sse of the
supplied 15' RG-58 cable
One section
SHA 5250
Skinny Mini VHF AIS Antenna
esne to eet the roer nwth rereents
of all popular AIS transceivers, this antenna mounts
with ease. Its compact size will be welcome aboard
any vessel. Chrome plated brass canister minimizes
de-tuning.
Built for AIS transceivers
SHA 5250-AIS
Shakespeare Emergency VHF Antenna
Stores itself in a yellow, metal tube that hangs up
where it's handy. The tube becomes part of the mount
when you set up the antenna. Includes 20' of RG-174
n o wth onnetor
Self-contained
Convenient hanger for easy storage
Sealed, tin-plated copper wire coil
One section
Built-in mount
Closed 9" long, open 16"
SHA 5910
Shakespeare Sailboat Racers VHF Antenna
Super light-weight black stainless steel antenna
Gold-plated connector
End-fed, center-loaded design
Black L-bracket included for mast mounting
One 15" section
SHA 5216
- ELECTRONICS 1
- Instruments 4
- Fuel Metering / Senders 8
- Beyond Virtual Reality! 10
- Transducers pg 169 11
- 7” colour display 12
- 10.4” colour display 12
- 8.4” colour display 13
- 12.1” colour display 13
- 4kW 48NM, 3.5’ open array 14
- 6kW 64NM, 4’ open array 14
- 2.2kW 24NM, 18” dome 14
- 4kW 36NM, 24” dome 14
- 600w/ 1kW Dual 15
- 4.5” display 15
- Furuno 2nd Station Display 16
- Furuno 2nd Station Handheld 16
- Furuno Auto Pilots 16
- Furuno In-Hull Transducer 17
- Furuno Thru-Hull Transducers 17
- Furuno Smart Sensors 17
- Maretron 19
- Bronze housing 20
- NMEA2000 to Yamaha CMD 21
- Depth Sounders 23
- North AmericaMAX Lakes 25
- BETTER DESIGNED 27
- BUILT AND BACKED 27
- Marine Stereos 28
- 6-1/2" 32
- 15 conductor (22-15) 33
- Black, 2-station set 33
- Ivory, 2-station set 33
- Black, phone only 33
- VHF Radios / CB Radio 36
- VHF Radios 37
- VHF HF/SSB CELLULAR AM/FM CB 38
- SATELLITE RADIOMARINE TV 38
- Antennas 39
- Chrome brass ferrule 40
- Nylon ferrule 40
- “L” Bracket for 5215 40
- VHF Antennas 42
- Nylon ferrule with standard 44
- 1in-14 thread 44
- ............... White 44
- ............... Black 44
- Lift-n-Lay 45
- SHA 5248 46
- SHA 5207 46
- SHA CN-1100T Telus 46
- SHA 4208 46
- Antenna Accessories 47
- 6" Extension 48
- 1' Extension 48
- 2' Extension 48
- Antenna Mounts 49
- 7/8" - 1" 50
- 1" - 1-1/2" 50
- Stainless steel 50
- Includes SM31 mounting kit 51
- Surface mount kit 51
- Radar Mounts 52
- 1/8" 55
- 3/16" 55
- 1/4" 55
- Wind Instruments 56
- Cable kit, 16.5' 59
- Battery Monitors 60
- Fuel Cells / Battery Chargers 61
- Battery Chargers 62
- Battery Chargers / Inverters 65
- Sine Wave Inverter/Chargers 66
- Sine Wave Inverters 66
- Inverters 67
- ME Series Inverter/Charger 68
- The Powerful Differ ence 68
- Available Accessories: 68
- Inverter/Chargers 69
- N o t e s 71
- � 73
- 73
- Isolators 77
- 12/24 Volt 78
- Regulator 78
- Corrosion Control 79
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