A ¼ λ Ground Plane for 70 cm

It is easy to homebrew this ¼ λ ground plane antenna for 70cm. All one needs is a TNC connector (see inset), 1.6mm brass brazing rod and a pack of ‘M-Seal’(epoxy sealant in dual component lump form).

¼ λ Ground Plane for 70 cm

Radiating element length in inches is 2808/f MHz minus the projecting length of the TNC hot end.

Radial length in inches is 2950/f MHz plus a little for soldering on to the TNC connector flange.

The soldered points are sealed against water ingress using M-Seal.

Related post: Coax Collinear for 70 cm
______________________________

Fox Hunt Attenuator

Here's the circuit of my homebrew fox hunt attenuator.

Offset Attenuator - Schematic

It's a simple offset attenuator with a low part count.

The potentiometer is used to vary the signal strength of the attenuated signal, available at +1MHz, +2MHz, -1MHz, -2MHz of the fox frequency.

This attenuator was successsfully employed at a couple of fox hunts in Bangalore.
______________________________