Product Description

5W AMP HF Packer PreAmp Model PA-100 Home Construction Project

This project parts and your efforts will eventually provide you with a compact 0.1 watt input to 5 watt output linear amplifier for use with QRP SSB/CW transmitters on the amateur bands 160 through 10 meters and which can be powered from a 12 volt DC supply. The design is a good balance between output power, physical size and battery power consumption. The completed amplifier will reward the builder with a clean, more powerful output signal for a QRP rig when radio conditions become marginal.

This project is not a beginner's project and requires a medium skill level to complete it successfully. Builders require soldering, hand tool, basic electronics and component identification skills.

The Model PA-100 amplifier module may be mounted within a SDR box thereby keeping the heat and RF out of the computer box and provide a suitable drive signal for the HF PROJECTS HF SuperPackerPro 100W Amplifier. The amp may also be optionally mounted in a stand-alone Bud Box case with the companion HF PROJECTS Low Pass Filter module. In this mode the drive input may be increased to a maximum of 1W at the gates of the MOSFETs. The Pi Resistive Attenuator (R2-R4) may be custom computed for the desired input drive level. Specifications Size 3.7 x 2.4 x 1.4 (LWH, including heat spreaders and spacers) Weight less than 3 oz. When populated Supply voltage 8.5 to 15 VDC (13.8V nominal); no reverse-polarity protection; Current drain, Standby approximately 30mA Transmit 1-1.3 A at 8 Watts Filter Selection 6-position rotary switch (ext filter reqd) Frequencies 160, 80, 60-40, 30-20, 17-15, 12-10 M Control Standby/Operate, PTT Input 2-pin Friction lock plug 0.1 50 ohm Indicator none Output 2-pin Friction lock plug 0.1 50 ohm Power cable 2-pin Friction lock plug .156 Drive requirement 0.1 watts RF (with internal 0.1dB pad) Power output 3-8 watts RF 160 10 meters Duty cycle Designed for intermittent SSB service Forced air 100% Intermittent 50% Spurious products -40 dB or better @ 5 watts w/ext filter Harmonic content -45 dB or better @ 5 watts w/ext filter Load tolerance 2:1 or better SWR recommended T-R delay approximately 0.2 second Control RF sensing or isolated PTT T-R relay Specifications above assume a 13.8 VDC supply and 50-ohm load at the antenna.