13 Feb 2014 – Construction Contest Winners Talk

Mods to Bird Thruline

Don, G4LOO, the winner in two categories, explains how he modified a Bird Thruline Power Meter to show peak readings for his entry in the Weekend Special Class. None of the modifications are permanent so at some later date the unit can be returned to it’s original condition, if necessary.

6M Amp Details

Entered in the Major Construction Class was a 6M Linear Amplifier built around a Russian ceramic valve. Don explained the problems associated in attaining efficiency in the power output.  As part of the control circuit, Don used a commercially  available PCB which he had to populate but he also decided to add sequencing to insure various areas were powered on in the correct order and proper time.