West Mountain Radio N8XJK Super Booster 58515-1777

West Mountain Radio N8XJK Super Booster 58515-1777
Part Number: 58515-1777
£299.95 ( £249.96 EXC. VAT )
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West Mountain Radio has collaborated with N8XJK to bring back the popular TG Electronics Booster! This unit will help you get the most life out of your battery.

This model is an improvement on a design that has been widely used in Amateur radio for more than 15 years.

The N8XJK Super Booster was specially designed for use with a radio.

When the voltage from a battery drops, the Super Booster brings it up to a level that allows for optimal transmit. The output level can be set by a trimmer pot to any value up to 15V. The advantage of using the Super Booster is that a Lead Acid battery is rated in Amp-Hours for use down to 10.5V. However, radios require at least 11.7V to transmit. That results in over one-third of amp-hours in the battery cannot be used for transmit without a booster.

For example, when doing 100W SSB with a 74AH battery (car size) allows for 10 hours continuous transmit. When using the Super Booster, the result is at least 15 hours of continuous transmit. Even at the last amp-hour of the battery's life, there is 10.5V and at least 11.7V to the radio. Transmitters tend to be more efficient at higher voltages, therefore there is additional savings by using, for example, 14.5V.

Booster Remote

The Booster Remote control/monitor unit is a compact remote head that monitors input/output voltage, as well as error conditions like over-voltage and over heating.

Super Booster readily accommodates the remote control or to connect units in parallel to achieve 80A or 120A.


High Power

  • Draws up to 40A from the battery
  • Connect units in parallel for 80A and 120A

Quiet, Thermally Controlled Fan

  • Allows for operation at max current continuously

Adjustable RF Enable Delay

  • When RF input is used provides smooth transmissions

Other Great Features Include...

  • Low voltage shut-off with LED indicator
  • Extremely low RFI
  • Switch for Boost, No Boost, or Auto when RF detected
  • Optional Booster Remote control/monitor unit


Connectors Anderson Powerpole®, 45A
Size 8.0" x 2.3" x 2.2"
Mounting Holes Four - 0.175 d, #8 hardware


Minimum Input Voltage 9VDC
Maximum Input Voltage 15VDC
Minimum Output Voltage 9VDC
Maximum Output Voltage 15VDC
Maximum Current 40A Input (per unit)
RF Voltage Maximum 100Vp-p (200W)

Current Consumption:

Power Off 1.5mA
Standby 24.4mA
Enabled Booster 40mA
Low Battery/Overtemp 39mA

RF Enable:

RF Detect Threshold 3.3Vp-p typical. (0.22W)
RF "Turn On" Delay 2ms typical
RF "Turn Off" Delay Range 2-500ms typical

Low Battery Lockout:

Jumper Selectable 9V, 9.5V, 10V, 10.5V, 11V, 11.5V, 12V
Voltage Drop When Booster Off 0.76V at 20A load
Efficiency Around 90%


Maximum Ambient Temperature (before shutdown):
32A Continuous Output

Maximum Case Temperature (before shutdown):
Bottom Center


Output Ripple:

Load = 20A (100W xmit) 4.2mV RMS, 12mVp-p
Load = 3A (receive) 3.5mV RMS, 10mVp-p


Voltage Diagram Field Diagram PWRgate Diagram Boosters in Parallel Diagram
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