GW4ALG's QRP Radio Pages

[ GW4ALG went QRT in February 2007 ]

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GW4ALG 80 m Transceiver

The home made transceiver covers 3.5 to 3.6 MHz and is CW only.  It has the following features:
- Full break-in operation;
- AGC;
- Clarifier/Independent Receiver Tune (IRT)
- Crystal ladder IF filter (about 600 Hz bandwidth)
- SWR indicator (LEDs for foward/reverse power)
- Side tone generator
- 12 v operation

Click on thumbnail to enlarge

Front view of transceiver

Side view of internal arrangement

This rig was used in NFD 2000 and was used for my operation as HB/GW4ALG/P.

 

Block diagram

Block Diagram

 

Circuit diagram

VFO

VFO Circuit

 

Receiver Front-End

Front End

 

AGC Amplifier

AGC Amplifier

 

Transmit Mixer

Transmit Mixer

 

Driver & Power Amplifier

Driver & PA Circuit

 

SWR indicator

SWR Indicator

 

Product Detector

Product Detector

Sidetone Oscillator & Audio Amplifier

Sidetone & AF Amplifier

 

Power Supply & TX/RX Switching

ps.bmp (29118 bytes)

 

Component connection information

Component Connections