Free radio pirates on medium and short wave messageboard of alfa limaPirate radio forum for short and medium with loggings, schematics, software, listening tips, antenna building, receiving pirate stations
The B.S.S spot. The place to Buy,Sell or Swap your receiving or transmitting equipment.
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New Trouble maker
Joined: Tue Mar 04, 2014 16:26 pm
Hi To ALL.
OK from the wealth of info on the internet and with much experimentation I've developed a PWM modulator that will replace any modulation transformer and associated high power audio amp that's 'normally' needed to modulate an A.M. carrier up to 500W (50V 10A MAX!). Will run from a 12V battery or even 130V + if you use different (off board) FET's. The circuit is all on a PCB (screened, masked etc) and less than 50mm square.
I also have a 100W class E (CMCD or E/F with different O/P config) amplifier too no bigger than your finger as a suitable companion for the modulator.
Next couple of kits under development are an optional audio compressor for the PWM Modj and a PIC/DSS frequency source with 16 programmable channels
Both current kits on EBay;
A.M. Transmitter PWM Modulator Kit
Class E/D RF amplifier Kit 100W
Let me know if your interested as I'll give you a better price if ordered direct!
New Trouble maker
Joined: Sun Jan 13, 2008 20:45 pm
Location: UK & Cyprus
Can you please mail me at: email@example.com
One of our customers would like to contact you regarding possibly purchasing some kits.
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We modulate the air as freely as we breathe it. We challenge those, who claims ownership and control of the natural elements of the Earth.