6. Using External Power Sources
The design of the HammerJack permits the use of certain external power sources, so long as some
precautions are observed. The 8-cell internal battery pack will serve about 98 percent of the users about 98
percent of the time. This makes for a caller that is compact and lightweight, highly portable, and has very
good battery life. However, we recognized that there may be times when extended run-times and
additional volume are more important than lightweight and absolute portability. You can have the best of
both worlds with the HammerJack!
By connecting a large external 12-volt battery to the external power adapter replacement door (sold
separately at FOXPRO), you can operate the HammerJack and obtain run-times measured in days rather
than hours. A NiMH battery pack supplies 9.6 volts to the power amplifier, while an external battery can
supply up to 14 volts. This additional voltage will offer an increase in power output to the speakers,
equating to additional volume. But there is a double-edged sword involved here. By giving the user the
ability to get more power from the amplifier, there is also a much greater chance of causing damage to the
built-in speakers. For this reason, we recommend using one of our large external speakers, such as the SP-
60, if you really need to, say, call crows from the next county. Not only are these speakers more efficient,
they will have no problem dealing with the extra power.
NOTE: If you must use extreme volume without the external speaker, use only the front horn. The rear cone
speaker is somewhat more delicate than the front horn. Please be careful with the volume control, and
remember these cautions when using an external battery:
NEVER connect an external battery to the charge jack.
NEVER connect a battery or power supply capable of delivering more than 15 volts to the charge
jack.
NEVER charge the external battery while it is connected to the HammerJack.
ALWAYS use a 5 amp (max) fuse in the positive battery lead.
ALWAYS act responsibly with the volume control to prevent speaker damage.
For maximum possible volume, use one of our optional external speakers, such as the SP-60.
7. Auxiliary Devices
The AUX jack is provided primarily for the control of FOXPRO decoys, and may be suitable for controlling
other similar devices. It is NOT intended for the direct control of motors, flashlights, or other devices
requiring the internal AUX jack circuitry to switch more than 50 milliamps. The jack tip polarity is positive.
Do not exceed 15 volts. You are urged to seek help from a knowledgeable professional before connecting
any unapproved device to the jack. Keep in mind that any damage to the FOXPRO caller as a result of
improper use of the AUX jack is not covered by the warranty, nor will FOXPRO be liable for damage to any
connected devices.
7-1 Integrated Decoy Wiring Harness
The HammerJack features an integrated decoy wiring harness (see image below) for connecting the Fox Jack
4 decoy (included with the HammerJack). Unlike other decoys offered by FOXPRO that require their own
power supply and wired connection to the AUX jack, the Fox Jack 4 Decoy mounts directly to the back of the
HammerJack and interfaces to the wiring harness for power and triggering of the decoy motion. Please note
that this wiring harness is designed to be used only with the Fox Jack 4 decoy! When you first remove the
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