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Date Posted by Category User IP

2013-11-23 (UTC)

K5UQ

HF Radios

ip174-70-126-160.no.no.cox.net

Small Wonder Labs SW40+ Excellent Condition $120

$120 shipped

The SW+ series of single band CW transceivers are designed by Dave Benson K1SWL who sells these little kits under the Small Wonder Labs product name. Originally designed for the New England QRP club as the NE40-40, Dave has updated the circuit and sells SW+ series kits for 80, 40, 30 and 20 meters. They are available as a board kit where the builder provides the case, controls and connectors.

SW+ series transceivers use a single conversion superhet receiver based on the NE602 mixer chip. There is no IF amplifier stage however a second NE602 is used as a product detector. The audio output is designed for headphone operation.

The VFO uses varactor tuning and the builder sets the desired tuning range using fixed capacitors provided with the kit. The SW40+ for sale tunes from 7.002 to 7.037 MHz. A standard single turn potentiometer is used as the tuning control.

The SW40+ transmitter puts out about 2 watts of power but it can be reduced by adjusting the internal drive control. QSK and keying is very nice. The sidetone uses the transmitted signal as heard by the receiver but there is no provision for sidetone level adjustment.

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