Expeditions to study doubling of common dolphn sightings in Hebrides

Common dolphin (copyright Dr Conor Ryan)

A substantial increase in common dolphin numbers off western Scotland is to be studied by Hebridean Whale and Dolphin Trust in a new season of marine research expeditions beginning next month.

The trust’s encounter rate with common dolphins has more than doubled over the past 12 years. The findings – recently presented to the European Cetacean Society – have emerged from the charity’s unique long-term monitoring of whales, dolphins and porpoises in

High Gain External Antennas suitable for Acorn cellular cameras

Standard Acorn Whip Antenna

Optional antennas which can be used as a direct replacement for the standard Acorn antenna to provide higher gain in low signal areas.

I often get asked about alternative antennas which will improve connectivity for the Acorn cellular cameras. The high gain whip and the yagi shown below are the ones that I use myself, both of which improve the signal strength to and from the cell tower.

The 6dBi omni directional whip is useful in situations where the signal with the standard antenna is one or two bars and unstable.

The 11dBi yagi is capable of providing a workable signal where no signal exists using the standard antenna. It is highly directional and can allow the camera to be used at a greater distance from the cell tower than would normally be possible.

The gain is measured against an isotropic source which is a theoretical point source of electromagnetic or sound waves which radiates the same intensity of radiation in all directions. It has no preferred direction of

Ltl Acorn 6210MC attacked by Lion in South Luangwa National Park, Zambia

This camera was the 840nm LED array version.