>>>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
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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