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## [AMPS] L-Net calculations: Am I doing something wrong?

 To: [AMPS] L-Net calculations: Am I doing something wrong? measures@vc.net (Rich Measures) Tue, 16 Feb 1999 23:54:02 -0800
 ``` > >>>Depending on his output impedance, he may have a very difficult time >>>matching with that much capacitance and still get a Q that is overly >>>large. With the 4-1000A, there is no way to match its high impedance down >>>to 50 Ohms and still get a good Q w/o doing this transformation. >>> >>? Wanna bet a large pizza with 4-toppings? > >Sure, I've been asking this question for the last week and you've never >entered the fray. > >The 4-1000A has an output impedance of 4600 Ohms (according to Eimac) at >5KV anode voltage. > ? RL depends on the ZSAC. With higher idle current, RL decreases. Using RL=DCV/2 x I-anode, at 0.8A, RL=3.125k-ohms. Designing for a Q of 15 at 28MHz, a Pi-L with an intermediate Z of 300-ohms, XC1=208 ohms, C1=26pF. L1=1.5uH. L2=0.64uH. C-load=129pF. Subtracting 10pF for the C-anode + stray C, C-tune is 18pF. The min. C of a UCS-300 is 5pF. Have I missed something? - later, Jon Rich... R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
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