Marker Distress Light
(C)Brooke Clarke,
General Information
The SDU5/E Marker Distress Light is used by people
rescued.& It has been replaced by the MS2000, but the MS2000
requires two hands for operation so the SDU-5/E is still the
marker light for some applications.& It is designed to take
obsolete BA-1574/U Mercury battery.& NSN -5209
There is some operation instructions in the manual for
SRU-21/P Survival Vest TM
55-.& The battery has a 3 year shelf life
temperate climates.
The back side of the marker light has a 1 1/2 x 3" patch of Velcro loop material to
the marker light to a mating piece of Velcro hook
material.& This
not how a SDU-5/E ships and was added by a prior user.
is a smaller Marker
Light that uses a 3 Volt flashlight bulb and a special lens.
In the movie "Blackhawk
is used to mark an enemy position.& The IR cover is
on with 100 MPH tape.
The hero of
is rescued in the opening scenes of the movie because he's
wearing two
SDU-5/E strobes strapped one on top of the other, but pointing
opposite directions.& I could not see this on the VHS tape,
can easily see it by capturing a still frame from the DVD.&
movie "Behind Enemy Lines" near the end Owen Wilson sees a
picks it up and without removing the battery cap shakes a 9 Volt
battery out of it.
Email from Ed in response to a
about the SDU-5/E on the Army Radios
Yahoo group:
I have several of those lights and
really like them.& I got some
battery adapters from Brooke Clark, (who is on this list), that
these strobes a lot cheaper to operate!& Brooke makes
for about anything that takes a battery to operate.& Most
a few in the space station, "just in case".& &
of his products are top rate, 1st class and I've never had a
problem with any that I have purchased from him.
The light that you mention is the old type safety strobe that
used by all sorts of Troops from Pilots to Special Operations
sometimes just us Troops on the ground.& I used one in
another cover so we could put it over the white light and make
another color, red or IR&I think, to keep it from being
ground fire when we were trying to call in air support at night
wanted to mark our position.& I just hated it when our guys
ruined our whole day!& Thank God it didn't happen that
guys did one hell of a GREAT job for us 99% of the time.&
one in a bar back when I drank they couldn't pay for a round,
I was around!!& I still feel the same but I don't go to
Back then we didn't have smart bombs or GPS or any of the neat
guys have today so we used what we could to stay alive!!&
replaced by the model 2000 I think it's called, I have a few of
too, they come with the shield built in and use two AA batteries
operate.& They are waterproof to a certain depth, I forget
but they are a giant improvement on what we used.& They
were great
the time, the very best and have lasted for years but the newer
had the advantage of taking everything that we bitched about and
them to take care of most of the bad stuff.
Go ahead and get an adapter from Brooke and save a lot of time
money and pain trying to find the correct batteries for your
Best Regards,
From - Tue Apr 22 17:31:16 2008
Hi Brooke,
I was Army, got out in 1971, did two tours in Vietnam, 1968
1969, both with the 1st Cav.& The 1st was mostly as a 60
I'm so big, 6'5" & then around 220 lbs.& 2nd tour was
Cav again, this time in Hueys 1st as a Door Gunner and then as a
Chief/Door Gunner, with the 1st of the 9th Cav, 1st Cav
all the way to SSG E-6 which was a neat pay grade as far as I
concerned.
Feel free to use anything that I say about your products.&
them as I see them, always have, always will and you make some
products without a doubt.& That's kept me from having as
as one would think but if they don't speak the truth and don't
hear the truth what kind of friend would they be?
Best Regards,
Ed Kirkley SSG E-6
US Army, Medically Retired
Vietnam 1968 & 1969
Maintenance
Electrical Check
Using a Fluke 87 DMM (or other DMM
a diode test function, but check lead polarity) and testing a
SDU-5/E by touching the Red
(+) test lead to the threaded brass contact and the Black (-)
small metal screw driver sitting on the pin in the bottom of the
compartment the Forward Voltage drop is 1.07 Volts.
Note: Using the Ohms range you
open circuit indication with the Black to Brass and Red to
&&& && && With Black to pin
to Brass you get about 2.5 Meg Ohms.
&&& && && Be careful not to
both probes at the same time since your skin resistance is
also in the
Meg Ohm range.
Functional Check
You can install a couple of 123
batteries with the positive contacts pointing up and then jumper
positive terminal to the brass ring on the strobe.& You
wait a second or two for the first flash.& If no flash
switch one time and try again.& Aluminum foil or a screw
can be used if you don't have a cap.& With the strobe
aginst your
ear you can hear the whine as the cap gets charged just like on
camera strobe flash.
Switch Boot
The rubber boot covering the on-off switch
removed by just unscrewing it.& There is a small ridge molded
the rubber that acts like part of an O-ring to make a water tight
seal.& But if the boot is partially unscrewed then it would
leak.& You might be sure it is snug and/or apply
a small amount of Radio Shack Lube Gel or other Silicon grease to
if you are concerned about water tightness.
TM 55- although listed on ETM
it is restricted
Y1-01-0353 Installation, Operation, and General Characteristics,
September 15, 1973. (authorized per TSO-C85) for the ACR-4F
If you have a manual let me
SDU-5/E Sinks
The SDU-5/E is designed to be attached to a Personal
Flotation Device (PDF) and it does NOT float in fresh water.&
a stock BA-1574/U Mercury battery it weighs 6 oz in air and 2 oz
completely submerged.& When the
and two 123
type photo Lithium batteries are installed the strobe weighs 6 3/4
in air and 3 oz when completely submerged in fresh water.&
why the SDU-5/E has a lanyard that exceeds 30
inches in length 161.012-7k
Model No. FED SDU-5/E
Serial No. 020595
Type Light Marker, Distress
Cont No. DLA-400-89-F-0490
Fed of Handicapped, N.Y. 10011, U.S. (212) ? their pay phone is
I have seen that other SDU-5/E lights were made by
Neo-Flasher in N. Hollywood, CA.
Construction
After carving the
outer case off the the internal potted assembly I
can say how the SDU-5/E was assembled.
First the empty case that includes the battery compartment
wire soldered to the battery compartment external thread and a
wires are soldered to the switch.& These wires are
brought up and
out of the
case and go to the PCB.
Functional test can be done at this point prior to the use
About 1/2" of white RTV is poured into the case potting the
The PCB is slid down into the case and about 2.5" of clear
is poured into the case leaving a little over 0.5" of space at
The Flash tube could be glued to the case before the clear
has cured if the unit is kept pointing up.
The circuit can not be traced but it looks like a 2.2 uF-250 V cap
the main energy storage unit.& The PCB has a transformer that
the oscillator that steps up the 6 volt battery supply to one or
volts.& There are a couple of transistors, one for the
oscillator
one to do the timing of the flashes.& The trigger coil is
flash tube partially in the air space.
Guidelines,
Useful Circuits, and Schematics - has
circuit diagrams that will be close to this one.
Lens Covers
Flash guard/Blue Filter FG1C
When the SDU-5/E
is used in a combat area there are important considerations
relating to
both friendly and unfriendly combatants.& The Blue Filter
addresses some of these.&& This Blue filter is part of
survival vest SRU21. First it causes the flash to appear Blue in
rather than white.& This will make it clear to friendly
that it is not muzzle
flash and that they should not shoot back.& Second there is a
that allows the light output to be aimed at the rescuer, assuming
know where to point it.
The Flash guard can be
when not in use.& The Blue filter material is
plastic that will
deform in or out so that this type of storage can be done.&
with my 5BA Battery Adapter installed the Flash guard will still
the SDU-5/E.
Another consideration when trying to be rescued and at the same
time evade an enemy is night signaling.& For this purpose
are Infra Red filters that can easily be seen with night vision
equipment but not by
enemy troops with their eyes alone.
carries the Blue& filter -
IR Lens Cover
Designed for
signaling at night with an enemy nearby.& Is used
as a marker IR strobe as in the movie Blackhawk
Infra Red filter that completely hides the visible flash,
when looking directly at the strobe when close.& If the IR
placed over the end of a TV remote that uses IR the remote will
When viewed with
bright flashes when the strobe is in the pouch.& In daylight
flash is dim when viewed in a camcorder, probably my camcorder has
filter. The IR flash is just as bright when the strobe is in an
when viewed by the M18 binocs.& There are no markings on the
Drop Zone carries the IR filter
Red Lens Cover
It was made for MP/AP use to mark
runways and LZ's at night.
Similar Product
ACR sells the Firefly 4F
4G strobes that appear to be equivalent.
The 4G has a magnetic slide switch and is intended for use
underwater.
Some 4F specifications:
Waterproof:&&&&&&&&&
Waterproof
50 ft (15 m) and shock resistant
Visibility:&&&&&&&&&&&&&
line of sight on a clear night from overflying aircraft
Certification:&&&&&&& Complies
74/83; USCG 161.012/1/0, 161.112/2/0, Canadian CG 4F is
(TSO-C85) approved
Operational Life:& Minimum 8 hours continuous to meet USCG
specifications
- Signal Devices also includes the SDU-30 and SDU-30 Marker
46 CFR 161.012 Specifications for Personal
Flotation Device Lights
46 CFR 161.012 PDF
storage for 24 hours at 149 degrees F, allowed to cool to room
then at -22 degrees fahrenheit for 24 hours per 161.012-10f,
warm up to room temp,
then submerged in 59 degree fahrenheit water and operating for 8
and flash between 50 and 70 flashes per minute - 161.012-11c
Power Sources
This is a cap designed to hold 2 each commercial 123 photo
batteries.
for pricing
The BA-1574/U ia a 5.2 Volt Mercury battery has the brass cap with
as part of the battery, not a separate cap.& The end that
the marker light has what appears to be a white rubber
marker light battery compartment has a pin that penetrates the
make contact with the battery.& NSN -"
long& to the o-ring]
The markings on the battery are:
Battery, Dry
DAAB07-88-D-C018
Battery Assm, Inc.
Bohemia, N.Y. (11716)
This is a modern Lithium Manganese Dioxide battery for
the SDU-5/E.&
It is made by Bren-Tronics (BT-70430) and Unicor
-9846).& This is the same chemistry used for the
photo battery that is used with
my 5BA battery adapter.& These batteries can NOT be tested
sets designed for the BA-1574/U Mercury battery.& The
appearance
of the BA-5374/U is just like the BA-1574/U, only the label
information
different.& The metal cap is still part of the battery.
K-304 Submarine Alkaline battery
batteries are not allowed on board submarines.& If there was
fire and a Mercury battery was involved, poison gas would be
not a good thing on a sub.& A LiSO2 battery can vent SO2
gas for a number of reasons.& This too is a bad thing on
sub.& So an alkaline battery was made for the SDU-5/E.&
Model No. ACR K-304, FSCM-18560
p/n S4-01-0003A
Type: Battery, Alkaline
CONTR. No. (blank)
NSN:& -1659, Data of Mfg. (blank)
ACR Electronics, Inc.
Fort Lauderdale, FL 33312
There is a 5/8" diameter protrusion at the top about 1.5" long
goes into the battery compartment.
A replacement might be made from a PX28L? battery with
it's positive end in the cap and a 7/8" spacer to make the
correct.& This is described in the book Power Up.&
the PX28L is also a Mercury battery that is no longer available.
Vehicle Power Adapter NSN -3369
This is a kit of parts made by ACR Electronics, Inc. that contains
that screws into the battery compartment and has a cable with red
wires inside.& In addition there is a separate voltage
will drop vehicle DC power (either 12 or 24 volt systems) down to
DC to power the marker light.& There are also numerous wire
a pair of battery clamps, tie wraps, Velcro hook and loop
materials.
Test Equipment
This tester will test the
BA-1574/U as well as other
Mercury batteries designed for survival radios like the PRC-90.
& Battery Tester
Troubleshooting
Did you install both batteries with the positive terminal
Are the batteries good?
After removing the O-ring and finger tightening the cap when
shake the strobe along the axis of the batteries are they
moving? i.e.
is the cap jamming in the threads before it seats on the
batteries?& This may look like you need to fat O-Ring but
will not fix it.& A way to test for that is to use some
foil instead of the cap to make contact between the top
positive terminal and the brass SDU-5 ring with the
threads.& Try
this with the switch pressed however it is, then again with
the switch
pressed again.&
When you hold the strobe up to your ear and press the switch
times to be sure one of the presses is the ON position do you
faint whining sound?
1 Nov 2008 - This is an on going experiment. & If the
appears to be totally dead, it may be possible to rejunivate
using a lab power supply.& A customer sent me his New Old
strobe that did not do anything when powered up with fresh
batteries.& It's marked:
s/n: 05170
c/n: D5A-400-75-F-4009
MFG: Federation of Handicapped
A clip lead from the bench supply positive to the brass threads
strobe.& A clip lead from the negative supply to a brass
sitting in a plastic tube, where the plastic tube has an ID
larger than the diameter of the point in the bottom of the
compartment.& Working the switch shows the off position at
current and the on position was at about 180 ma, yet there was
After sitting powered up for a few hours there were periods of
with about a 4 second interval (two seconds is more normal) and
was no "snap" noise with the flash.& After a few days the
is close to two seconds and there is a "snap" with each flash.
The theory is that the High Voltage cap electrolyte has lost
polarization and needs to see HV for some time to reform.&
the strobe is running the HV ramps from near zero to maybe 350
and back to near zero, it does not stay at the HV value.&
takes much longer to reform than it would if the HV could be
applied as
a DC value.
This also suggests that instead of leaving the strobe on the
many years and expecting it to work when needed it would be much
to run the strobe until the batteries are dead.& This might
done now if it has not been run for some time, and once every
years thereafter.
Note:& It may take 20& seconds to an hour without any
for the strobe to start flashing if the HV cap needs to be
2 Dec 2008 - This strobe has been running for a month.&
power is removed for a few hours and then turned back on it
seconds before the first flash.& So the long operation time
not reformed the capacitor., or maybe it has reformed as far as
can?& Must likely the HV capacitor is bad.
has the SDU-5/E as New Old Stock
Bren-Tronics - BT-70430 is a LiMnO2 replacement
ACR Electronics -
battery comes with a seperate cap. Directly replaces mercury 4RM1B
& - Survival
- remember to press "NEXT" at the bottom of a page
Drop Zone sells the IR Lens Cover - out of business
Back to Brooke's , , , Home
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