MFJ-4416C Voltage booster for 12V DC
The voltage booster MFJ-4416C helps with better efficiency and assures always the right volatage for your radio equipment, especially in mobile environments.
Most of todays 100 W mobile HF transceivers are designed for an operating voltage of 12 to 16V. With voltages below 12V many things go awry: distorted modulation, loss of output power and undefined states of the digital electronics.
With mobile installations, there are usually two main reasons for under vorltage: a) voltage drop on the power cable and b) low battery voltage.
In the first case, even very small resistances on connectors, fuse holders etc. cause a large drop in voltage. A resistance of just 1/10 ω leads to a drop of 2V at a current of 20A. The second reason is the battery voltage itself: with the motor running the generator easily puts out 14V or more. But when the motor is off the battery voltage quickly drops to 12V, even with a new battery.
This low battery voltage, combined with cable losses - and your radio has a problem!
The MFJ-4416C prevents such problems reliably by boosting the input voltage (down to 9V!) up to a constant 13.8V. This at a max. current of up to 25A peak! The conversion has an efficiency of nearly 90%.
The compact device (size 196x100x54mm, weight ca. 700g) is solidly constructed and made for the demanding mobile environment. The connections for input and output on the MFJ-4416C are Anderson PowerPoles and additionally large binding posts. An internal fuse (30A) protects the stabiliser against overload. The minimum accepted input voltage can be adjusted to 9, 10 or 11V (10V is the default setting). This prevents a deep discharge of the battery. The output is protected with a crow-bar against overvoltage, in case the voltage regulation should fail.
Another feature further raises the efficiency of power consumption:
A HF sensor input recognizes if the transmitter is on or not. When receiving the voltage regulator can be bypassed and the loss of efficiency due to the conversion can be alleviated. To use this feature you need a T junction and a short coaxial cable. This function can be turned off, so you have "Boost always" or "Boost only when transmitting".
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