[AMRadio] AM Radio

[ne1s at securespeed.us]

>
> I think the reference was to PDM (pulse duration modulation) vs.
> plate modulation,
> although not mentioned.  PDM has been a BC standard for over 25 years and
> is normally good for 125% positive modulation.
>
> This method was described for ham use years ago in AM Press-Exchange,
> the predecessor
> to Electric Radio.  Circuitry a bit more complex, but no iron required.
>

April 1988 AM Press Exchange article by KA1SI (previously, and now again,
WA1QIX). Vacuum tube class C final with vacuum tube class D (PDM)
modulator.

I built my own version of that transmitter which can be seen here:
ne1s.rfburn.org

Used most recently last Sunday on the AWA Sunday PM AM net (3837 KHz at
4:00PM EST on Sundays); the transmitter has been on the air since January
1 1995.

73,
-Larry/NE1S