Amps
[Top] [All Lists]

## [AMPS] 4-1000A Project

 To: [AMPS] 4-1000A Project W8JI@contesting.com (Tom Rauch) Fri, 6 Apr 2001 11:21:38 -0400
 ```> > The current circulating in a pi-net tank coil divides between > > the load capacitor and the coax because they're effectively > > in parallel. > > That isn't correct. They are in series, but have different resistances > loads across each one. Woops, I should have been more clear. I was speaking of the capacitors at each end of the tank. The load capacitor is across the load resistance, so current in the capacitor is proportional to the voltage across the load and the reactance of the capacitor. The concept of being "in parallel" allowing summing of currents to obtain the current delived to that end of the tank or the circulating current is incorrect. > > between the output coax and the load capacitor. At 1500W, > > the coax will take 5.5A RMS and the load C will take the > > same amount. So, the circulating current will be about 11 Amps. I re-did this for a circuit Q of 15 (input Q 14, output Q 1), and I get approximately: Load current 5.3 amps Load capacitor current 5.3 amps Inductor current 7.5 amps Tuning cap current 7.5 amperes The circulating current is not the sum of load and loading capacitor current. > > That's close but not exactly true. Every component has a different > current. Circulating current in the inductor is the highest at 6.6 > amperes. > > > As a rule of thumb for a Pi-net at HF, it looks like the > > circulating current runs about twice the coax current. > > Assuming you design for generally recommended Q's. > > When designing for higher frequencies, Q's tend to run > > much higher. > > That rule of thumb does not work. > > > > > 73, Tom W8JI > W8JI@contesting.com > > -- > FAQ on WWW: http://www.contesting.com/FAQ/amps > Submissions: amps@contesting.com > Administrative requests: amps-REQUEST@contesting.com > Problems: owner-amps@contesting.com > 73, Tom W8JI W8JI@contesting.com -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com ```
 Current Thread [AMPS] 4-1000A Project, (continued) [AMPS] 4-1000A Project, conrad.farlow@virgin.net [AMPS] 4-1000A Project, na9d@mindspring.com [AMPS] 4-1000A Project, John Nelson [AMPS] 4-1000A Project, Jon Ogden [AMPS] 4-1000A Project, Tom Rauch [AMPS] 4-1000A Project, Phil (VA3UX) [AMPS] 4-1000A Project, jeff millar [AMPS] 4-1000A Project, G SEVEN [AMPS] 4-1000A Project, jeff millar [AMPS] 4-1000A Project, Tom Rauch [AMPS] 4-1000A Project, Tom Rauch <= [AMPS] 4-1000A Project, Tom Rauch [AMPS] 4-1000A Project, Jon Ogden [AMPS] 4-1000A Project, Phil Clements [AMPS] 4-1000A Project, Jon Ogden [AMPS] Re: close calls, Tom Rauch [AMPS] Re: close calls, G SEVEN [AMPS] Re: close calls, G SEVEN [AMPS] safety check list, G SEVEN [AMPS] safety check list, steven grant [AMPS] 4-1000A Project, Wt8r@aol.com