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Plant personnel use the paging capability to locate individuals throughout the facility, Further communication then occurs over the party line, allowing two or more people to converse without being heard over the speakers. Each indoor, outdoor, or hazardous area wall station contains a speaker amplifier for driving speakers. In addition, Desktop, Desk-Edge, and Flush-Mount stations include a separate subset equipped with a cable to plug into the remote enclosure. A single resistance load is required for each page and party line circuit to establish line impedance and minimize effects of stray induced hum or noise signals. For ease of load adjustment, a GTC line balance assembly should be placed near the electrical center of the system, and near an indoor handset station in a quiet area.


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The ubiquitous Phalanx close-in weapon system CIWS provides warships a last line of defence against missiles, aircraft and small boats. Upgraded over time, it has been in service for 38 years with the Royal Navy. Here we look at the history, design and capabilities of this system. Development of the Vulcan Phalanx began in the s as the US Navy woke up to the threat of the sea-skimmers after the destruction of Israeli destroyer Eilat by Russian-made Styx missiles in The M61 Vulcan Gatling gun had been in service since and was initially developed for use in air-air combat.

Substantial development and trials were needed before the Mk Phalanx went into full production in with USS Coral Sea taking the first operational Block 0 mounts to sea in Unfortunately, Sea Wolf was expensive, had a large equipment footprint and had only been fitted to a handful of frigates when the Falklands war unexpectedly erupted in April Other ships were hit during low-level bomb attack and the lack of close-in defensive capability was badly exposed.

In the s RN could have argued that it was primarily an ASW navy, and had not prioritised close-in defence for the surface fleet. Illustrious was rushed into service to provide reinforcements for the Falklands War. Photo: Rosedale Note the strengthened barrel restraint and muzzle brace to support the longer barrels and the Infra-Red camera on the left side. Over 1, units have been manufactured and many have cycled through upgrade programme more than once. The 30 systems employed by the US in Iraq had defeated over missile and mortar attacks by They were all eventually returned to the RN and converted to 1B standard.

Left With the radome removed the rotating search radar can be seen on the top of the mount. The parabolic tracking radar can be seen below. Right the 6-tonne mounts moved around the workshop by gantry crane.

Retro-fitting Sea Wolf to RN warships was neither affordable or practical whereas the Phalanx offered an immediate remedy. While the Falklands war was still in progress, two Phalanx systems intended for the USN were taken off the production line and rushed to Tyneside where HMS illustrious was hastily being completed.

Phalanx was first tested at sea by Illustrious on 20th June and again on 26th June, destroying the Rushton target with the first burst of fire. Although the Argentines surrendered on the Falklands Islands on 14 June, hostilities had not formally ceased. Equipped with Phalanx, the ship sailed south with greater confidence that an Exocet attack on the carrier could be defeated.

Phalanx has remained in RN service ever since The Type 42 air defence destroyers received the system and also their replacements, the Type 45s. Units are also fitted to Royal Fleet Auxiliary vessels, being rotated around ships as operational requirements dictate. The self-contained nature of Phalanx makes it particularly useful for self-defence of large, vulnerable auxiliaries that lack their own sensors and combat systems.

The Goalkeeper system has the advantage of heavier rounds and almost twice the effective range of the original Phalanx, able to break up an incoming missile further way from the ship.

The through-life costs of the larger Dutch system were higher as it was deck-penetrating, limiting which vessels could carry the mount. Sister ship HMS Albion now carries Phalanx, which has benefited from an on-going development programme in a way that Goalkeeper has not. As missile technology evolved, Raytheon has developed the Phalanx System in response.

The original Block 0 system could take two men as long as 30 minutes to reload from pre-linked ammunition boxes. B1 Baseline 1 raised the rate of fire from 3, rounds per minute to 4, B1 Baseline 2 improved accuracy with an improved muzzle restraint to decrease round dispersion. Block 1A introduced a new computer system to counter high diving and hard manoeuvring missiles and switched from hydraulic to pneumatic gun drive which could spin up faster.

The Block 1B upgrade PSuM Phalanx Surface Mode launched in was the most significant update so far, a response to navies increasingly operating in the congested littoral areas. The solution was the addition of electro-optical thermal imaging technology to supplement the radars. The stabilised Forward-Looking Infra-Red FLIR camera is mounted on the left side of the radome also allows the operator to visually identify targets in complex environments.

The original M61A1 gun barrels were designed for short bursts and dispersion increased with barrel wear. Through a rolling procurement programme, the RN had accumulated 36 mounts by which comprised a mix of Block 1 Baseline 2 and Block 1A. Subsequently, an additional 8 units were upgraded and in a further 5 new B1B mounts were purchased directly from Raytheon, primarily intended for RFAs.

In Babcock received a contract to upgrade a further 4 units. There are at least now 41 mounts in the RN inventory and at least 33 of them are B1B standard. Units are rotated between warships in refit and RFAs not deploying to high threat areas, providing for planned maintenance, as the table above indicates, there are sufficient numbers for the RNs requirements. For simplicity Phalanx does not rely on sophisticated IFF transponder systems for target discrimination, instead, every contact is assessed using closed-loop heuristic software.

If the target is inbound, able to manoeuvre to hit the ship, and moving at a pre-determined minimum speed then it will be engaged. Once confirmed as hostile, the contact is passed to the tracking radar which locks on at about 8 km range. When the target is about 2km away from the ship, the gun opens fire. The tracking radar compares both the target and the stream of outgoing rounds, adjusting the gun so the projectile stream converges on the target.

Accuracy is such that typically the third round out of the barrel will hit. In the event of multiple attacks, the next most imminent threat will immediately be engaged.

The system can track and assess up to 6 targets simultaneously. After an engagement, two sailors will re-load the ammunition drum at the earliest opportunity.

The gun barrels are removed and the radome assumes the horizontal position protected by a cap for transport and installation. Sept Weapon engineers of Naval Air Squadron are assigned to the Royal Fleet Auxiliaries to maintain aircraft and self-defence weapons. Other than ammunition lockers, the impact on the ship is minimal. RFA Tidespring, April Rounds being loaded. The orange discarding sabots are clearly visible. HMS Southampton, May The RN has never fired Phalanx in anger although it has provided reassurance to crews during many operations.

Despite being proven during multiple tests and trials the system has had a slightly unlucky history. Their speed makes them harder to detect and track but it is their vast kinetic energy that is particularly deadly. Assuming the CIWS manages to break up the missile somewhere under 1km before impact, then the ship may still be sprayed with high-velocity fragments.

This is obviously preferable to the intact missile impacting and detonating deep inside the ship but deadly fragments are likely to disable delicate sensors and penetrate the light steel plate of modern warships. Phalanx may prevent the loss of the ship but may not be able to stop it from becoming eliminated as an effective fighting unit. It will always be preferable for a PDMS to destroy the inbound missile well outside the Phalanx range and much further away from its intended target.

Phalanx is likely to be very effective against any aircraft that managed to get within its operating envelope but this is an increasingly unlikely scenario in an era of stand-off weapons. Amongst some naval enthusiasts, CIWS have almost become fetishised with arguments that Phalanx should be carried by virtually every vessel in the Naval Service as some kind of virility sign. In an ideal world of unlimited resources, every frontline vessel would have a complete set of equipment and not be subject to STOROB.

Because each Phalanx requires weapons engineers to maintain and support the system with accompanying cost and manpower overhead, it is a sensible policy to rotate between vessels deploying to higher threat areas. The self-defence capabilities of the aircraft carriers draw a great deal of comment but Phalanx is just one of their many layers of protection.

Photo: S. The RN selected to go for the Phalanx 1B update instead. Using the same mount, to launch Rolling Airframe Missiles, SEA RAM has far greater range 10km but is more expensive and the shot launcher is challenging to reload at sea. During tests in , it successfully destroyed incoming mortar rounds. Initially, the LDEW is intended to provide short-range air defence, counter-UAV and close-in protection for naval vessels while the gun is retained for heavier missile targets.

The attraction of the Laser is its accuracy, ability to react quickly and no requirement for ammunition. As they grow in power, theoretically targets could be destroyed at longer range and the Laser may eventually eclipse the gun and PDMS.

These non-deck penetrating mounts can deliver 5 rounds per second out to about By delivering heavier shells further away from the ship, in the CIWS role, the Mk 4 is superior and more flexible than Phalanx in some ways, able to use a variety of specialised munitions, depending on the target.

Photo: BAE Systems. When assessing the effectiveness of Phalanx, it should be seen as one part of a layered defence system. This includes intelligence-led assessments of the threat, area air defence, electronic warfare and decoys which are often overlooked or underestimated. Clearly not an infallible shield against a saturation attack by modern hypersonic missiles, Phalanx is, however, an affordable and relatively simple way to add a significant layer of protection against many threats.

A little overblown perhaps? Phalanx remains an affordable because we already have it way to add some extra protection against a limited set of specific threats might be more truthful? It has other uses. Several Americans have made mention of Iranian boat flotillas turning around and going home when a Phalanx was brought to bear, and in both of those cases the Americans were slewing the Phalanx around so they could use the electro opticals on the side of the 1B, not the gun itself.

They could…. They are reasonable likely to have their own directors fitted and so be a much more capable anti-missile system. UK MoD is now a combined arms force nothing more nothing less.

Mk 4 Bofors has a round magazine, it uses the ships combat management system and sensors, Max range is 12,meters effective range is smaller , kg without ammo, rpm, round barrel life, muzzle velocity radar, tv camera, full 3P integration and Backup controls on the mount itself. Italians dropped the 40mm Breda Bofors for 76 Oto with guided rounds.

The 40mm Bofors was dropped before the 3P rounds were introduced in s. Breda Bofors i still make reference to Bofors because those guns in L70 were licensed to Breda to manufacture and modify them.

The mod is just adding a fuze setter onto the mount. The Leonardo Marlin 40 is lighter again than than the Bofors Mk 4, but only holds 72 rounds 2 x


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In a rail weld position, rail head corner failure above mud pumping spots are observed due SM SMA SM Basic strength (N/mm2).

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Features Blogs News Interviews Articles. Cash Store Points Store Shop. On the move, boat running! Boat comes home every night for battery top ups on trickle charger and garage protection The important things to consider here is what battery configuration should I be looking to setup to power the system? Attached Images. Nice boat! You have the negative of my V Doing a stereo upgrade in the future,will be watching to see suggestions also.

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sm400i speakers corner

The ubiquitous Phalanx close-in weapon system CIWS provides warships a last line of defence against missiles, aircraft and small boats. Upgraded over time, it has been in service for 38 years with the Royal Navy. Here we look at the history, design and capabilities of this system. Development of the Vulcan Phalanx began in the s as the US Navy woke up to the threat of the sea-skimmers after the destruction of Israeli destroyer Eilat by Russian-made Styx missiles in

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JPG] and the amplification head in it's current environment. I've finally got round to taking some pics of my swr gear. JPG] Watch out for pics of my other Swr gear. You don't see many of them at all, what a rarity!!. On my first look i thought it was a grand prix pre-amp. Here is a poor pic of my SWR - a 4x8 and 1x15 from the early 90's.

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Push each side/corner in separately and don't assume it is latched just because it isn't falling off. XLT SM Heavy Duty Speaker Microphone.

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  1. Bailintin

    Excuse me for what I have to intervene ... similar situation. Write here or in PM.