MOSFET CW transmitter update

[ka1tdq]

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

[W3GMS]

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 

[W3RSW]

**** The Happy Boarder ****

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.