Jim, KH7M wrote, in part: Rich, AG6K responded: And, presumably under this plate current, the QL, the loaded Q of the tank will be something above 10, or so. However, Rich has caused me to revert to
[...] Another way of looking at it is that the purpose of the tank circuit is to create a load line for the tube. It does that by transforming the 50 ohm load impedance "backwards" up to typically a
Ian, I always notice a difference in tuning for for a given maximum at any particular level. Normally, when I tune my 3K Premier with 10-20 watts drive for maximum power at this level, inevitably the
When you tune-up the PA for maximum RF output, you're presenting the tube with a load line that optimizes the efficiency. When you change the drive level and re-tune for max, you're RE-optimizing it.
"On the other hand, to get closer to optimum IMD you'd need to tune and load for maximum output at the highest drive level, then increase the loading (which usually improves IMD but notably does not
tune. Power If you are winding down the drive to get down to the legal limit, the improvement in IMD because of less swing dominates. Underrunning a big amp in this way should help reliability, life
As long as the amplifier is correctly biased and not nearly in class C ! I found this out when a transistor amplifier bias failed because of a dry joint. Seemed linear from 10W-100W. Didn't check tha
indeed. For a tetrode with handles amplifier, backing down the mic. gain puts the amplifier in ultralinear Class A operation. If you don't need full suds to communicate, it's the right thing to do.
"In my opinion, it's tempest in a teapot. Does it really matter if one's signal strength decreases or increases by one S-Unit as long as one is not interfering with a neighbor who is trying to phone
Peter, G3RZP, wrote, in part: Ah ha, I knew it had to be so; even if I got all tangled up in Terman's explanation, hi. 73, Jim, KH7M Looking forward to the New Year, and the arrival of my BIG Henry!!
NO, buying "regular commercial" amplifier is more like having a Porshe with a lawnmover engine and bicycle wheels. For contesting, most of "commercial" amplifiers go up in smoke after a couple of hou
a couple contest Out here, and over on the Island of Oahu, at the six tower, Pacific Contest Station of KH7R, Henry 3K amps are used at all multimulti stations from 80 through 10 meters - five of th
I dont even like the sound of a Porche. My idea of overkill enjoyment is a 427 powered Corvette ragtop just rumbling along barely above idle along the beach; turns a lot of bikinis. Power is fun in t
There ya go! Jim W7RY -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Se