[hpsdr] Amps for HPSDR

[Jeff Kelly]

Assembled Pennywhistle with 6 meter setup. $135.00 shipped CONUS ONLY

Assembled COMMUNICATION CONCEPTS board type EN-27A amp - $165.00
shipped CONUS ONLY. Built by 4Z4RB

"A solid state High power HF linear amplifier built on COMMUNICATION  CONCEPTS board type EN-27A by MOTOROLA .
The amplifier uses 2 BJT transistors MRF-454 matched pair by MOTOROLA.
Amplifier is built with the best components and the bias circuit had been modernized
to employ modern devices instead of the hard to get round 723 regulator.
Temperature tracking of bias is employed and the circuit is very stable at all power levels.
5 W in puts 140 W out on a 50 ohm dummy load at 13.6 V .
The current is about 23A.
Idling current can be adjusted with a variable resistor on board to meet class AB of
operation. A full description will be included with the unit.
Tested and performing great for an easy installation with your needs.
The bias circuit can be switched on/off externally to allow stand-by/receive option.
Teflon coax in/high power Teflon coax out with phono type connectors (male)
All Mounted on a heavy duty heatsink to allow good and reliable operation."

Raising cash for 1500. Contact off list

Jeff
KT2K
jkelly at bellatlantic.net


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