Foxhunt VK3YNG Sniffer 4 Instruction Manual - Page 14

Browse online or download pdf Instruction Manual for Receiver Foxhunt VK3YNG Sniffer 4. Foxhunt VK3YNG Sniffer 4 15 pages.

Print Page

VK3YNG Sniffer 4 Instruction Manual (for V2.2 hardware)

Sample antenna designs

The antenna design is largely a matter of personal choice. For portable use, designs

vary between two and four elements. More elements give better directivity and more

precise bearings but are more difficult to carry around. For most situations, three

elements offer a good compromise. Here is an example of antenna designs for 120

and 146MHz.

Typical 3-element Beam Antenna (based on VK3VT design)

Tap Length

(centre to centre)

Balun

(RG174 coax cable)

BNC Connector

Sniffer Mounting Plate

73 x 80mm

Rev 2.2a

Director

Frequency:

121MHz

146MHz

Director

1118

930

Driven Element

1178

981

Refelector

1237

1029

Tap Length

138

115

Element Spacing

373

311

Balun Length

815

680

All units in Millimetres (divide by 25.4 for inches)

Element Lengths from Tip to Tip

Element Material: 10mm aluminium tubing

Tap lengths are typical and may require adjustement

Driven Element

25mm

Reflector

Page 14