QRP CW WITH SW+20

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SW+20 schematic

Keyer

AF amplifier

This QRP CW (20m band) transceiver is based on the SW+20,from smallwonderlabs.

I've added a transistorized keyer and a small AF amplifier,with an additional AF decoupled output,for the connection to a recorder.

FEATURES

SW+20 TRANSCEIVER

True VFO: 14.030 to 14.070 MHz coverage CW only

Superheterodyne design, with crystal filtering

Quiet solid-state T-R switching (QSK)

Output Power Adjustable- 2.5W max

KEYER

transistor oscillator

adjustable speed,8 to 25 wpm

AF AMPLIFIER

1W on 4 ohm

additional decoupled AF output

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Copyright 2007 by IW7EHC all rights reserved