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Title: MOSFET CW transmitter update Post by: ka1tdq on February 27, 2015, 06:12:50 AM I've managed to get more power out of my single MOSFET CW transmitter. Before, I was just getting 7 watts output using 13.8 volt on the drain. I figured that the only way to increase power output was to increase drain voltage. I bought a regulated 48 volt supply and power jumped to 27 watts.
I figured that number was low though since I'm using something like 30 volts on my AM transmitter and I'm getting 30 watts carrier there. The only difference was that I was using 2 turns on the output core vs. 5 turns on the CW rig. I removed one of the turns and now I'm getting 50 watts output. I think 50 watts is respectable for a digital 3 stage home-brew transmitter. Jon KA1TDQ Title: Re: MOSFET CW transmitter update Post by: W3GMS on February 27, 2015, 07:10:43 AM I've managed to get more power out of my single MOSFET CW transmitter. Before, I was just getting 7 watts output using 13.8 volt on the drain. I figured that the only way to increase power output was to increase drain voltage. I bought a regulated 48 volt supply and power jumped to 27 watts. I figured that number was low though since I'm using something like 30 volts on my AM transmitter and I'm getting 30 watts carrier there. The only difference was that I was using 2 turns on the output core vs. 5 turns on the CW rig. I removed one of the turns and now I'm getting 50 watts output. I think 50 watts is respectable for a digital 3 stage home-brew transmitter. Jon KA1TDQ Congrats on your project Jon! Going from 7 to 50 is very good. Now off to the high power class E rig :). Joe - GMS Title: Re: MOSFET CW transmitter update Post by: W3RSW on February 27, 2015, 09:15:44 AM **** The Happy Boarder **** AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I'm all tricked out in a sea of blue. Just what will ol' Jon make me do? To up my power from seven to fifty; Down to one winding, ain't that nifty? Good show Jon. I learned good stuff following your progress. A nice second step would be a PP pair at The impedances and voltages you've found. I think binocular cores are sooo cool. |