[Amps] Microwave oven transformer, mobile supply

[Steve Thompson]

-----Original Message-----
From: Larry Kayser <kayser@sympatico.ca>
To: amps@contesting.com <amps@contesting.com>
Date: 17 March 2002 00:53
Subject: [Amps] Microwave oven transformer, mobile supply


>Looking at the inverter I decided to try and see if the inverter would run
>an ex Microwave Oven transformer so that I might use a single 813 in the
>trunk as the afterburner for a CW mobile station using a QRP rig as the
>exciter.  The transformer is loaded with a 275W dummy load of
>resistors.  The voltage rests at about 1650 V AC, dropping the resistive
>load 90% takes it up to only 1750 V AC.  I have run the setup for a number
>of trips of 75 miles each way with about 50% duty cycle.  The transformer
>does not get excessively warm and the high voltage AC is reasonably stable.
If you are going to use a capacitor input PSU, it's worth looking at
predicted peak and rms currents - a good tool is the simulation prog. at
www.duncanamps.com

Steve