MICRO-AMP Version 2.0 VHF Amplifier Manual
This manual is for the Micro-Amp low power amplifier intended for use with the Micro-Trak APRS transmitters. The amplifier is a transmit-only device, meaning it is not suitable for use with transceivers. The amplifier was designed for low duty cycle operation, and does not have a heat sink suitable for continuous operation. The Micro- Amp is intended only for use only in the Amateur Radio Service.
The Micro-Amp utilizes very few components. The assembly of the PC board should start out with the installation of the two 22 Microfarad chip capacitors. The easiest way to install these devices is to first lightly tin the pads on the top side ground plane (the sides not connected to the traces) place the chip capacitor over the pad. Hold down the chip, and apply your soldering iron to the ground plane side pad. The surface of the pad will melt the solder on the chip, and tack that end down temporarily. Solder the opposite side pad down by heating the pad and capacitor end pad equally, and applying solder. Note that the 22 Mfd capacitors are polarized and must be installed in the correct orientation.
Install the 4700 PF capacitors in the spots as shown on the PCB layout and photo. Note that these are not polarized. Install the 10 Pf capacitor as shown in the circuit board layout and photos. Note that this capacitor is tipped with a black mark, which will distinguish it from the smaller 4700 PF capacitors. Polarity of this part is unimportant. Install the 1N914 or equivalent diode. This diode is for reverse polarity protection. Install the trimmer potentiometer and the three screw power terminal. NOTE: Make sure you point the recesses in the terminal block outward! It will be difficult to wire the unit if you install this part backward.
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