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Thread: 1,000 Watt Marconi Radar Systems Military Short Arc Searchlights

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    BVH's Avatar
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    Default 1,000 Watt Marconi Radar Systems Military Short Arc Searchlights

    Newest acquisition. I spotted these behemoths a couple weeks ago and stayed with the bidding process until I snagged these powerful military Short Arcs. While they may remotely resemble the MegaRay, the light with the 90 degree mirror weighs 72 lbs and the straight output light weighs 60 lbs. The optic you see in front of the straight output configuration light is approx. 5.75" to give some idea of scale. I am expecting them to arrive any minute so some of my description may change as I confirm things. I brought them all the way over from North Wales, UK. Can you believe it....They were picked up on Tuesday morning and are almost here.

    I've not been able to determine what they were prototyped for (These are Prototypes #2 and #3) but I would suspect some type of aircraft. Not that I am all that familiar with all military lighting, but I have never seen nor heard of anything like these so I have a feeling they never made "production". They don't really resemble any helicopter light I've seen so maybe they were developed for some type of fixed wing reconnaissance aircraft. No hits on Google other than the sales thread and a forum they were on before. They were made by Marconi Radar Systems, Ltd before they were absorbed by BAE so that puts these lights at somewhere around 1985 or earlier. Does anyone know if visible light is ever used to run or test radar systems? I have wondered if they are somehow related to radar systems. The seller had them for a couple of decades after buying them at a MOD military auction in 1991. They both function as designed and built. The second light has a rotating mirror in the head to deflect the light 90 degrees, other than that, they are the same. The switch box provides knobs for dimming and one to rotate the deflection mirror. Each one has an internal shutter so the light can remain on without any visible light being transmitted. Sort of like the VSS-3a and how it turns on in infrared mode so as not to give away its position inadvertently. The seller states that the input fuse is rated at 75 Amps and the system runs on 28 Volts so knocking off 1/3 of the power (as a guess), these could be 1500 Watt Short Arcs. I don't know beam spread at this point either but am hoping for 2 degrees max and better yet, 1 to 1.5 degrees.

    At some point, I am going to try to get to my test range for comparison shots. However, I don't want to repeat my "tank lights" episode from years back in which my 2.2KW VSS-1 "tangled" with the local Police departments' 1.6KW NightSun. There are no PD choppers here so I'll just have to worry about the local patrol vehicles. To power them at the range, I'll need my 4.5KW, 240 Volt generator and the Lorain 29 Volt, 100 Amps Rectifier. I think the 240V/16.5 Amps from the genny will be enough but will run the Lorain in the field but will try it at home from the house 240V/30 Amp circuit first to measure. That's a lot of heavy stuff to handle so the beam shots won't be easy to get. And the genny noise plus what I expect to be an impressive beam will probably generate calls.





    Cooling fan intake or exhaust, not sure yet




    Separate Power Supply




    Be Careful!




    Switch Box




    Front View




    Profile




    Right Angle device




    OEM Crates




    The Pair




    The light is a full third larger than I had imagined. It is a monster but I don't think it's 80 lbs. Guessing 60 but will weight it later.

    Fire Foxes 3 and typical Kleenex box with tape measure.




    I just had to take the front lens off to see inside. I'm very surprised. The orifice the light is emitted from is about 1/4" to 5/16" in diameter. Makes me think this is a laser. It's kind of scary looking in there. But then it hits a Plano Convex lens and is dispersed. How much, I don't know. I've got a lot to look at before I fire one up. And then I don't want to melt anything I'm aiming at so will break out a leftover piece of 3/4" granite slab.

    Last edited by BVH; 10-20-2012 at 04:43 PM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Default Re: Right Place At The Right Time - Vers. 2.0

    A few more pics. Upon removal of the ignitor cover, I noticed that there is white "goop" over the surface of the main ignition coil. However, on all other coils like this that I have seen, the goop or other insulation is hard. This stuff looks and feels like it has turned to the consistency of Thermal Compound and the oil base has partially separated from the solid material. There is an oily film on many of the components and on the bottom and side of the ignitor housing. Anyone ever seen this?

    Ignitor Cover




    Ignitor Coil with Goop fallen off




    More Goop where I don't think it should be - probably from shipping




    More Goop thrown around




    Warning




    Ignitor identifier




    Cooling Fan




    Ignitor Cover with Goop

    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* FRITZHID's Avatar
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    Default Re: Right Place At The Right Time - Vers. 2.0

    incredible find Bob!!!! I'm jealous as hell! Lol
    interesting with such a small light output orifice, I'm very curious!
    I Got tired of looking for the light at the end of the tunnel so i lit that bitch up myself! Convoy s2 365nm, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, Amondotech n30, vss-3A, Reylight Ti Lan v3, Helius Sigma 9, astrolux s41 219, Shadow JM35, BLF GT,

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    Flashaholic* The_Driver's Avatar
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    Default Re: Right Place At The Right Time - Vers. 2.0

    I love following you story-type monster-light-threads

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    Default Re: Right Place At The Right Time - Vers. 2.0

    Thanks Driver!

    More pics of the lamp and surrounding area

    Finned "Snout" removed to reveal lamp and shutter device. The burn impression on the shutter reveals the beam to be about 5/8" in diameter as it hits the shutter.




    There's a small motor that pivots the shutter out of the beams' path. The reflector is obviously an Elliptical as it's harnessed all output into the 5/8" diameter beam at the shutter and then after traveling another inch or so, it passes thru the .300" hole behind the shutter. From there, it has to travel about another 6" to hit the Convex lens where it is collected, diverged and sent out tightly collimated at about the size of the 5.75" lens according to the seller.




    Front of the light, snout removed showing lamp support. One of the two bolts on the right was nearly falling out of the hole.




    Lamp Close-up. Chamber looks to be about 1 5/8" in diameter. I didn't notice the "0.8" and smaller text in the reflector while taking the pic. I need to go back and see where it's coming from. Only markings on the front base so far are "49". I still don't know the power level of the light. I'll have to take readings with the ignitor cover off at some point. checking and setting focus will be a time-consuming task. The snout needs to be removed for each movement.




    Much as I want to, I've decided to not remove the lamp until I have run the light just in-case something happens during removal and re-installation and I want to get the Volts and amps at the bulb so I know the power level and can get a new bulb made if the need arises.
    Last edited by BVH; 10-13-2012 at 09:01 AM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Default Re: Right Place At The Right Time - Vers. 2.0

    Just some guessing of output power. Based on the strip resistor in the power supply, the lamps running Voltage will be between 20.2 and 20.8. after start-up and boost. They have tapped the strip at 3 points and each tap lands on its own terminal which is marked with a Voltage range. The cable directly out to the ignitor and then to the Anode is on the "20.2V - 20.8V" terminal. My second guess is that the Amperage draw will be somewhere around 66% of the 75 Amp input fuse rating - so 49 Amps. 20.5 x's 49 = 1004 Watts. Once I finish re-insulating the 45KV ignition coil, I'll be able to fire it up and verify the numbers. I'm hoping for more than 1000 but logic tells me it will be right at 1000 Watts. Changed the title to reflect my guess. Doing lots of cleaning and polishing while I wait for the multiple layers of liquid electrical tape to fully cure on the coil. Maybe done by Wednesday.
    Last edited by BVH; 10-15-2012 at 10:01 PM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* FRITZHID's Avatar
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    Default Re: Right Place At The Right Time - Vers. 2.0

    I Got tired of looking for the light at the end of the tunnel so i lit that bitch up myself! Convoy s2 365nm, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, Amondotech n30, vss-3A, Reylight Ti Lan v3, Helius Sigma 9, astrolux s41 219, Shadow JM35, BLF GT,

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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Neat! Thanks for pics and data. Glad someone here got them, I considered bidding but shipping cost looked huge from UK (you obviously sprung for air freight).
    For power supply, just fired up my AN/VSS-3 with a Mean Well RSP-1500-27 switch mode up to 56A output and will run on 120V, $335 + tax and shipping from PowerGate. Might work for you.

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    Default Re: 1,000 Watt Military Short Arc Behemoths

    I mentioned in your VSS-3 thread about member Modamag's 2 remaining Lorain 29V/100 Amp rectifiers that will run off 120V. $150 each. He's in your area so you could pick one up, no shipping.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* Echo63's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    looking forward to seeing this thing fired up.

    i dont think i will ever get anything bigger/badder/brighter than a Maxabeam, but to see one of these big beasts (60"CA, VSS3, Megaray, Locator etc) in action would be awesome
    flashlight collector by day
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    Enlightened Zephrus's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Hey BVH nice lights and great find! Having been a pilot for a while and from my time at Fort Rucker, my best guess would be that these were design to be some sort of quick-deploy beacon lights for military aircraft. What leads me to this conclusion is the rotating (or oscillating) mirror head on the one light. There was most likely a rotator also meant for the second which got lost along the way. I think that, with the rotator attached and operating, the beam profile and divergence will tell us more. Typically, aircraft beacons will have a slight upward angle of a few degrees as well as a certain spread, and will be configured such that the lower portion of the beam is near parallel with the ground or diverging about a degree from it.

    When you get these babies fired up it should be more telling. Check the mirror, is it absolutely flat or does it have even the slightest convex shape to it? It may be hard to tell on visual inspection but will be much more obvious when operating. Also when operating, see if the beam really is deflected 90 degrees of if there is any upward angle along with a certain amount of divergence. Does the mirror actually rotate or is it a side-to-side oscillation? How fast is the rotation or oscillation? I was also noting the converging mount holes in the flanges on the light without the rotator head... can't really see the other side but this may be another clue. It does say "searchlight starter" on the power supply but that may not be very telling if it was a "generic" light starter used in other apparatus as well. Being prototypes this really has me curious

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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Thanks for the thoughts, Zep. I've spoken to the Advanced Radiation Corp (ARC) guys a few times on lamp orientation. It is always best to orient the bulb so that when a light is in normal operation, the Anode is straight up. This is because all the brute forces of the flame are directed at the large Anode electrode - which is designed to take the heat and force. Cermax bulbs come with a warning not to operate them above 45 degrees above the horizon. This is because the thin Cathode is in front. Point it up too much and the flame will be blown back against it and damage occurs rapidly. This is the same configuration used in these lights. The Cathode is in front. If the lights are pointed up, the bulbs would most likely expire quickly. I can only conclude that they are made to run horizontal (an acceptable compromise) or possibly even run facing down - best for the lamp. The Anode in the VSS-1 was straight up. Perfect for the bulb since the light was used horizontally, not much up or down. My 600 watt helicopter minigun light has its' Anode in the rear so as it's pointing down, the Anode is up. The VSS-3 has its' bulb oriented horizontal - the compromise. So these certainly could have been airborn using the compromise orientation. But why the 90 degree head?

    The non-90 degree light has a cast alum lens holder that finishes it off in front so the lights were made to be finished off either way - straight or 90 degree. Either end piece will go on either light - the snout and its' mounting flange are the same on both lights. The rotational motor wiring exists in both lights.

    I did learn a tid bit today from an acquaintance. He knows someone who worked supplying a few short arc bulbs to a military contractor here in the U.S. many years ago. It was secret at the time. The light was being developed to defeat some type of Radar system. It was heavy in the U.V. output and could be variably pulsed and was approximately 1KW. I don't see any pulsing facilities or components (not that I would necessarily recognize such components) but it is interesting that Marconi Radar Systems business was all about designing and building Radar systems. Who better to develop a Radar defeating device that themselves?

    Final coat of Liquid electrical tape applied today. A good 24 hours to dry and maybe tomorrow or Friday might be fire-up eve. Not sure about the beam shots though. Gotta think about how to do it descretely.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    BVH's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Grabbed a quick, down and dirty beam shot out of the garage. Just kind of a "it works" shot. Unfortunately there is no frame of reference beyond the gate. The next surface for light to hit is 4,800 feet away and fog was starting to obscure it. So at this point, I don't know how it looks on typical 350 yrd, 900 yrd and 1,100 yrd targets I usually shoot at. Not much else I can do given the length of my power supply cables. Might try my tired 110 Amp SLA's to see if I can take the setup to the range one night. Kind of looks like a natural gas flame.

    It's a 1000 Watt light, give or take. Running about 19.5 Volts and 49 Amps to the bulb, all other components such as fans etc are out of the calculation. So it's currently running at about 955 Watts.

    The end of my Cul-de-Sac is just to the left of the beam and I made sure that all neighbors were in for the night and that no lookie-loos were coming before I ran it. Neighbors across the street were aware and promised not to look at the source. Even with all this, I was very nervous about lighting it off.

    If you love the sound of a gas turbine winding up, you'd love to hear the start up of the power supply and light cooling fans. The closest I've ever heard! Man, it sounds WAY COOL!

    Last edited by BVH; 10-19-2012 at 08:59 PM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* FRITZHID's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Look'n good bob! Glad to see you got at least one of them fired up!
    Seems like a damn bright beam, but is it me or just the photo, that makes it like its weighed heavy to the upper right? Can't wait to see how the distance shots compare! Wtg bud! Congrats:-)
    I Got tired of looking for the light at the end of the tunnel so i lit that bitch up myself! Convoy s2 365nm, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, Amondotech n30, vss-3A, Reylight Ti Lan v3, Helius Sigma 9, astrolux s41 219, Shadow JM35, BLF GT,

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    Flashaholic* The_Driver's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Quote Originally Posted by BVH View Post
    Grabbed a quick, down and dirty beam shot out of the garage. Just kind of a "it works" shot. Unfortunately there is no frame of reference beyond the gate. The next surface for light to hit is 4,800 feet away and fog was starting to obscure it. So at this point, I don't know how it looks on typical 350 yrd, 900 yrd and 1,100 yrd targets I usually shoot at. Not much else I can do given the length of my power supply cables. Might try my tired 110 Amp SLA's to see if I can take the setup to the range one night. Kind of looks like a natural gas flame.


    It's a 1000 Watt light, give or take. Running about 19.5 Volts and 49 Amps to the bulb, all other components such as fans etc are out of the calculation. So it's currently running at about 955 Watts.

    The end of my Cul-de-Sac is just to the left of the beam and I made sure that all neighbors were in for the night and that no lookie-loos were coming before I ran it. Neighbors across the street were aware and promised not to look at the source. Even with all this, I was very nervous about lighting it off.

    If you love the sound of a gas turbine winding up, you'd love to hear the start up of the power supply and light cooling fans. The closest I've ever heard! Man, it sounds WAY COOL!
    Very cool
    How about a video of the startup process?

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    BVH's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Turn the volume WAAAY up!




    By the way, the searchlight is not dimmable. The "Dim" knob on the switch box is for dimming the switch box "Shutter Open" and "Lamp On" pilot lamps.

    I received 7 cables with the lights. Each cable is sheathed in a fine brass/bronze flexible weave material. I'll bet each cable cost between $300 and $500 to manufacturer.

    When warmed up, total Amp draw is about 57 including the fans. My 100 Amp Lorain rectifier acts as though it's not even turned on. There is no Voltage sag at all. 28.0 when idle and 28.0 when powering the load. What a deal at $150! And as a bonus, there is no cooling fan so no useless noise. It has massive heat sinks on the back side.
    Last edited by BVH; 10-20-2012 at 10:12 AM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* The_Driver's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Thank you very much for the cool video

    Thats louder than I though it would be, your description sound about right though

    I do think the noise would be somewhat prohibitive when using the light anywhere...

  18. #18

    Default Re: 1,000 Watt Military Short Arc Behemoths

    Marconi is part of BAE now. I used to work for them at the Rochester factory (Rochester in Kent, not Rochester in New York). I cant actually say what they made there (official secrets act) but suffice to say they were THROWING OUT loads of cool stuff...I expect they may have had some stuff similar to what you've got there. If only i'd been into lights back then!

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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Thanks snake. Might you know of anyone who may have worked at the Leicester plant who might know something about these?

    Driver your right about the noise being loud for a light. But it sure sounds great and adds to the mystic of the lights. These certainly won't be "casual use" lights with all the equipment needed to run them away from a 240 Volt outlet. I could do it now but it would take my 175 lb, 4.5KW generator, the 85 lb Lorain and its' #4 cables, 30 lbs of hook-up cables, 55 lb power supply and 70 lb light. I'd love to spring for some high Amp Hour, custom 7-cell SLA's but they are way too much money for very occasional use.
    Last edited by BVH; 10-20-2012 at 04:39 PM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* Walterk's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    What do you do in your spare time? Googling and ebaying on 'prototype searchlight' ?!
    Congrats, interesting thing.

    Would have thought it was for optical communication..say over the Street of gibralter or over the Berlin wall.
    Is the some kind of shutter inside? Or only the oscillating mirror?

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    BVH's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Post #5, pics 1 & 2 show the shutter in-place and moved sideways by hand. It is solenoid controlled and is instant. I do spend some fair amount of time on Ebay!

    Quote Originally Posted by Walterk View Post
    What do you do in your spare time? Googling and ebaying on 'prototype searchlight' ?!
    Congrats, interesting thing.

    Would have thought it was for optical communication..say over the Street of gibralter or over the Berlin wall.
    Is the some kind of shutter inside? Or only the oscillating mirror?
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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    Flashaholic* FRITZHID's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Jesus bob! Good thing that lamp weighs so much, it sounds like it could hit 30,000 ft, and I don't mean with a beam! Lol
    Hope you have ear plugs!
    I Got tired of looking for the light at the end of the tunnel so i lit that bitch up myself! Convoy s2 365nm, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, Amondotech n30, vss-3A, Reylight Ti Lan v3, Helius Sigma 9, astrolux s41 219, Shadow JM35, BLF GT,

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    Flashaholic* Echo63's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    That thing sounds awesome as it starts up !.

    Given that it has a shutter, is it possible it's a communication device ? For sending morse code ?

    Actually thinking about it, it's probably way to bright to use at any range where the curvature of the earth wouldnt interfere
    flashlight collector by day
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  24. #24

    Default Re: 1,000 Watt Military Short Arc Behemoths

    Bob, Even my wife appreciated that power supply and lamp wind-up!!! Nice video!!!!
    AN/VSS-3 Military tank surplus searchlight

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    BVH's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    All the toggle switches in the switch box are ultra stiff to operate. A Morse Code operator would not last an hour toggling the switch. The shutter permits the light to be "turned on and off" without having to constantly re-strike it.

    The light without the 90 degree mirror is not functioning. It's blowing the 10 Amp fuse#2 (FS2) in the switch box. This happens by simply flipping the "Searchlight On" toggle switch to the "On" position. The fuse is in-line and ahead of the ignition toggle switch so I can't even try to ignite the lamp (well, I can, but nothing happens ) . The fans run and I think there is "potential power" to the bulb (but I need to confirm this). This is the light with the ignition coil that I re-insulated. Since there has never been an ignition pulse to the coil since I received it (because the fuse was blown when I checked it out before operating it), I do not believe it's anything I did. I simply removed the coil, re-insulated it and re-installed it. I've ruled out the Power Supply as neither PS would fire it up (neither of the 2 switch boxes too). Fritz, when life settles down for you, I'd like to pick your brain for trouble shooting procedures.

    Power Supply #1 also has an issue, although it works powering up the good light. It wasn't until I powered the good light with PS#2 that I was rewarded with my gas turbine melody. PS#1 must have a low Voltage issue supplying the PS fan and the light fan because they run at a much, much lower speed as compared to running with PS#2. No jet whine!! And airflow is greatly reduced. At the same time though, it is providing full Voltage and current to the lamp circuit. I have not had the time to find where the circuits are common and branch off from each other to begin trouble shooting.

    Quote Originally Posted by Echo63 View Post
    Given that it has a shutter, is it possible it's a communication device ? For sending morse code ?
    Last edited by BVH; 10-20-2012 at 08:54 PM.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

  26. #26
    Flashaholic* FRITZHID's Avatar
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    Default Re: 1,000 Watt Marconi Radar Systems Military Short Arc Searchlights

    Will do bob, should be arriving in FL in a few hrs :-)
    I Got tired of looking for the light at the end of the tunnel so i lit that bitch up myself! Convoy s2 365nm, Maxa-Beam Gen II, 55w hid/100w incan Vector Twin, Amondotech n30, vss-3A, Reylight Ti Lan v3, Helius Sigma 9, astrolux s41 219, Shadow JM35, BLF GT,

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    BVH's Avatar
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    Default Re: 1,000 Watt Marconi Radar Systems Military Short Arc Searchlights

    I just pointed the seller to this thread. He pointed out that my Lorain Rectifier power supply is a Marconi product. How appropriate to run my Marconi Lights with a Marconi power supply.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

  28. #28
    Enlightened
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    Default Re: 1,000 Watt Marconi Radar Systems Military Short Arc Searchlights

    Man that startup does sound awesome lmao. I was waiting for that piece of wood to start smoking :d You should take some measurements on the cp of this thing im sure it would be up there

  29. #29
    Enlightened nealitc's Avatar
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Nice! Surprised cooling fan does not stay on for a few after lamp shutdown.

  30. #30
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    Default Re: 1,000 Watt Military Short Arc Behemoths

    Quote Originally Posted by nealitc View Post
    Nice! Surprised cooling fan does not stay on for a few after lamp shutdown.
    It is possible to do if I use the "Emergency Overide" toggle. It kills the lamp but runs all the fans. That's how I would routinely do it when running them....it...if I could. What I have has pretty much turned out to be one good set and one 'parts spares" set. Light 1 works as designed and built. Power supply 1 works mostly as designed. For some reason, it signals the "Lamp On" pilot light full time, whether or not the lamp is lit. It also automatically, with a slight time delay, closes the main relay such that the emergency Overide toggle will not disengage it to shut down the lamp and leave the fans running. Other than that, it is good to go. I just do a normal shut down and then after a few seconds, turn the searchlight on again for a few minutes for cool down.

    Light 2 does not ignite. The 10 amp fuse associated with the ignition switch blows the moment the "Searchlight On" switch is closed so there is no chance to try to ignite it. Power Supply 2 performs all functions normally with the exception of feeding all 3 fans (2 in the light -external heat exchanger fan and internal heat exchanger fan) with about 33% of their needed Voltage so instead of turning 6,000 RPM, they turn at about 2,000 with a huge resulting reduction in cooling air. So much so that I won't use it.

    Someone more knowledgeable in electronics troubleshooting could probably figure all these issues out with not much trouble but I don't have the knowledge. I did some preliminary on the light but it's beyond me. Also did some preliminary on the PS 2 but could not get it. In looking at both PS's, there are subtle differences in wiring and on one of the 2 PC boards so it's not as though I can compare readings directly to one another. They are prototypes and so I would expect the development team to have tried different things with different lights. Everything points to there having been 3 protos. 001 - 003. I have lights 2 and 3 and Power supplies 1 and 2. I have cable sets for all 3 minus the 3rd cable from the light to the PS. However, I am totally ecstatic just to have got them, working or not!

    I just need to figure out what I'm going to get to power the PS "in the field" so I can get some test range shots. Ideally, I'd like to get one of those "racing" 14V/7-cell AGM's and a matching 12V/6-cell so I can Series them for 27.3 Volts. Or if I'm brave, two of the 7-cell units for 29.4. One drawback is that they are only 50-Amp Hour rated. And it gives me some concern because it's not as though the entire 60 Amp load is placed on the power supply all at once such that I would would have enough Voltage sag to get back down to 28 or so. Before I can ignite the lamp, the fans circuit and the circuit for all the "potential" lamp power are both energized with the "Searchlight On" toggle, which draws only 7 Amps so that 29.4V would be hitting pretty much every component in the PS and light.

    I've got to schedule a trip up to ARC so that the corrosion on the Cathode lamp base and the Cathode power connection braided cable on Light 1 can be removed and a new connection cable welded onto the base. Even though I have a "spare" lamp in the 2nd light, I might just have a new one made to keep.

    Just from the brief beam shot event, I have a feeling that my beam angle is going to be in the 3-4 degree range. It seemed to "cone out" more than my 2 degree Megaray. But that was just a quick impression on a foggy night so I could be wrong. I need to be able to step 100 feet away to the side on a long distance shot so I can see what the spot actually looks like on terrain.

    I've got both units all tucked away in their beds for now. I should be getting my new 600 Watt lamp for the M-134 Minigun helicopter light soon and I need to do some work on the electrical connector and build a cable to have ready for when it arrives.
    WWII 60" Carbon Arc (Sold), 1.6KW NightSun, 1KW VSS-3A, .8KW TrakkaBeam, 600W M-134 Light, 500W X-500-14s, 500W Starburst, 500W A120b, 450 Watt AEG German Leopard 1 Tank Light, 300W Locators, Megaray, 150W Communicator, Maxabeam Gen3, Pichel 75W Mini-Novas

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