Well, I finally figured out how to tune this SB-220 using what Elecraft gave me for now. FSK-D at 50W is a good place to start; quickly peak tune and load while keeping an eye on lg and lp seems to work well. That portion of the tuning takes me about 5 to 7 seconds to do. I then bump power up to 100w and then tune for max smoke which is another 3-5 seconds. Afterwards, I drop exciter power to whatever output I want while leaving the SB-220 at its current tune settings. As a result, 100 watts out of the K3 and a good tune registers about ~790ma lp and about ~250mA lg. It seems like a 10-1 ratio with the 220 on CW/Tune mode; i.e. 10 watts out of the K3 gets me 100w out of the SB-220... 100w out of the K3 gets me 1000watts out of the amp. I think all is well at this point!
73 de James K3JPS On Thu, May 28, 2009 at 11:20 PM, Bob Garrett <[email protected]> wrote: > Jim, > > Let's not make this complicated. Set the K3 to say 10 watts out and tune > up the SB220. Increase the output from the K3 and adjust the SB-220 for > the output you desire keeping in mind the plate and grid current limits. > BINGO, you are good to go. > > 73, Bob K3UL > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
