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Professional downrigger fishermen understand that different species of game fish
prefer different temperature ranges. Additionally, they understand that
maintaining a specific range of trolling speeds is not only important to attract
game fish but is also important to ensure the lure is running with the proper
action.
However, it can be very difficult to predict the speed and temperature of a lure
when trolled at varying depths below the water surface. Surface speed and
temperature gauges are ineffective at predicting sub-surface conditions since
day-to-day environmental effects such as wind speed and wind direction can
create underwater currents and drastically alter the sub-surface water
temperature.
The Depth Raider system measures and displays this vital speed and
temperature information with digital precision. The Depth Raider speed
and temperature monitor tells you the exact speed and the exact temperature of
your lure at it's running depth.
Theory of Operation - Upon entry into the water, the underwater
sensor/transmitter probe unit continuously measures speed and temperature then
periodically transmits a digitally encoded RF signal onto the coated downrigger
cable. The signal is received by a receiving antenna mounted on the downrigger
boom. This signal is then routed to the receiver/display unit via a coaxial
cable.
The receiver/display unit continuously monitors for data transmissions from the
underwater probe unit. Once a transmission is received, data is decoded from the
RF signal and converted into speed and temperature which is then displayed on
the LCD display.
Coated downrigger cable is necessary to prevent the lake water from absorbing
(attenuating) the signal transmitted from the sensor/transmitter unit. The
coating provides electrical isolation from the water since water is a conductor
of electricity. Without the coating (or electrical isolation), a portion of the
signal is absorbed by the water thereby reducing the signal level at the
receiving antenna. Without the coating, as the depth of the probe continues to
increase, the signal level at the antenna continues to degrade until it is no
longer adequate for proper interpretation by the receiver/display unit. It
should be noted that the actual depth of operation without a coated cable can
vary greatly from installation to installation, boat to boat, water conditions,
etc.
While the Depth Raider system will operate to varying depths without the
coated cable; installation of the coated cable is highly recommended to provide
proper operation to 200 feet.

Sensor/Transmitter Probe Specifications:
| Power Source | 9V Alkaline Battery |
| Battery Life | Greater than 225 hours of underwater operation, typical |
| Battery Access | Screw-on cap with dual O-ring seal |
| Turn On | Automatic turn-on when Probe enters the water |
| Turn Off | Automatic turn-off after Probe is removed from water |
| Physical Size | 6.375” Long x 1.89” body diameter |
| Body Construction | Custom injection molded housing |
| Internal Construction | Electronics 100% sealed in epoxy to prevent water damage |
| Electronics | Microcontroller based ultra-low-power electronics |
| Speed Sensor | 6 tooth ferromagnetic rotor with electronic magnetic sensor circuitry |
| Temperature Sensor | Precision temperature sensing device |

Receiver/Display Unit Specifications:
| Power Source | 12VDC Boat Power |
| Current Consumption | <75ma (backlight off), <500ma (backlight on) |
| Physical Size | 3.25” X 3.75” |
| Housing Construction | Custom injection molded housing |
| LCD Display | Custom LCD with large .59” tall digits. User adjustable LED backlighting |
| Temperature | 32.0 to 99.9 degrees F |
| Speed | 0.0 to 9.9 MPH |
| Power Down Mode | Auto shut-off in 30 minutes if no transmissions from Probe are detected |
| Silicone Keypad Configuration | 4 user pushbuttons. Power On/Off button, Backlight On/Off button, Backlight intensity increase and Backlight intensity decrease |
| Low Probe Battery Warning | LO BAT icon is activated when probe battery is low. |

Depth Raider Display
Receiver/Display Features:
1) Displays temperature at the probe from 32.0 degrees to 99.9
degrees F.
2) Displays speed at the probe from 0.0 to 9.9 miles per hour (MPH)
3) LO BAT icon - when illuminated, the 9V battery in the probe is low and should
be replaced soon. The low battery indicator is calibrated to ensure you have a
minimum of 8 hrs. of use prior to battery replacement. If this indicator
illuminates during an outing the user may continue to use the system for up to 8
hours. Just be sure to replace the battery at the end of the day so you are
ready for the next outing.
4) ON/OFF button - Press this switch momentarily to turn the unit on. When the
unit is on, press and hold this button until the unit shuts off. Remember, the
receiver/display unit has an auto-off feature, so if you forget to turn it off,
the unit will turn itself off if no probe transmissions are received in a 30
minute period.
5) Backlight button - Press this switch momentarily to turn on the backlight. If
the back light is on, press this switch again to turn the backlight off.
6) Backlight control - Press the > arrow button to increase the backlight
intensity.
Press the < arrow key to decrease the backlight intensity.

Depth Raider Underwater Sensor/Transmitter Probe
Sensor/Transmitter Probe Features:
1) Upper connection tab - The probe unit transmits the RF signal
onto this stainless steel tab. Attach the downrigger cable to this tab. This
connection must be isolated from the water with rubberized electrical tape to
prevent the transmitted signal from being absorbed in the water. Rubberized
electrical tape is included with the Depth Raider system.
2) Raised Boss - This raised boss is part of the injection molded housing. It's
purpose is to provide an electrically isolated flange that the rubberized tape
can adhere to ensuring a good seal. This boss is also handy to quickly determine
which side of the probe unit connects to the downrigger cable.
3) Lower Connection Tab - This tab is used to connect the downrigger cannonball.
Be sure to use an 18”-24” drop leader of lower test. If the cannonball gets
snagged on the bottom, its better to lose the cannonball rather than the
probe and the cannonball. This tab is internally electrically isolated from
the upper connection tab. Therefore, there is no need to use rubberized
electrical tape on this interconnect.
4) Ferromagnetic Rotor - We call it a ‘Paddle Wheel’. This device is molded of
plastic and magnetic particles. It has 6 teeth or ‘paddles’ around the
circumference. Every time a tooth passes by the magnetic sensor located inside
the unit, an electrical pulse is generated. The probe unit measures speed by
counting these magnetic pulses over a specific period of time.
5) Battery Cap - Remove this screw-on cap to access the battery compartment. The
cap features a two-O-ring seal to prevent water entry into the unit. Also, this
cap has an aggressive knurled exterior that aids the user in removing the cap
with wet, slippery hands. Be sure to keep the O-rings well lubricated with
Vaseline or similar lubricants. Tightening the cap without lubricant can quickly
damage O-rings.
The Depth Raider system includes everything
necessary to install on your downrigger equipped boat. The system includes the
following:
- Underwater sensor/transmitter probe unit
- Receiver/display unit
- Receiving antenna
- 25’ antenna-to-receiver coaxial cable with gold plated connectors
- 6’ DC power cable with in-line fuse holder and power plug
- 200’ coated downrigger cable
- Termination kit to connect coated downrigger cable to probe
- Rubberized electrical tape
- Cannonball drop leader kit
Large, easy-to-read LCD display on receiver with user adjustable backlighting
Compact receiver/display unit can be mounted in a variety of locations
Receiver/display unit features automatic turn-off when no probe transmissions are detected in 30 minutes
Smallest underwater probe unit on the market
Ultra-low power electronics design extends battery life to over 225 hours typical
Probe automatically turns on when it enters the water
Electronics are encapsulated in epoxy to prevent damage from water should an O-ring fail
Double O-ring seal on battery cap prevents water entry into battery compartment
Precision speed and temperature sensing devices
LIMITED
WARRANTY
The Depth Raider Speed and Temperature Monitor system is warranted to be
free from defects in materials and workmanship for a period of one (1) year from
the date of purchase. The warranty registration card included with the Depth
Raider system must be completed and returned at time of purchase to validate
the warranty. In the event of a malfunction, the complete system must be
returned with shipping charges prepaid to Kell Laboratories, Inc. The returned
product must also be accompanied by proof of purchase and $8.50 for return
shipping and handling. Kell Laboratories, Inc. will assume no liability for the
costs associated with the installation or removal of the equipment for repair
under this warranty. This warranty does not cover the coated downrigger cable,
O-ring seals, loss, misuse, abuse or improper installation of components of the
system. Any repairs necessary as a result of misuse, or abuse will be performed
at the current hourly rate in place at the time of repair and charged to the
customer. Customers will be notified of any charges prior to performing the
services. This warranty is valid for the original purchaser only and is not
transferable. Kell Laboratories, Inc. assumes no other liability except as
stated above.
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