Construction of Dale Hunt’s 80m ARDF Receiver · PDF fileConstruction of Dale...

Construction of Dale Hunt’s 80m

ARDF Receiver Kit

Kevin Nichols, KA7OFR

Why 80m ARDF?

• No (well, much much less) reflections or

multipath

• Small antenna & receiver

• Simple to build as a kit

• Transmitters are small

• Fits well with Orienteering

Dale Hunt’s (WB6BYU) 80m

ARDF

• Fairly small, hand-held

80m (3.5MHz) ARDF

receiver

• Single stage direct

conversion type receiver

• Easy alignment

• Described in QST,

September 2005

• PCB available from FAR

Circuits

80m ARDF Kit Parts

PCB, Silk Screened

Some Helpful Items

Schematic - +5v Reg

Schematic – Audio Amp

+5v Regulator and Audio Amp

Schematic - VFO

VFO

Right on Frequency

Winding Torroid Transformer

PCB Almost Finished!

A Metal Case

Wooden Loop Antenna Holder

Schematic – Loop Antenna

Threading the Loop

Schematic – Sense Antenna

Sense Antenna

Sense Antenna

Wiring the Front Panel

Ready to Close ‘er Up

The Finished Product!