[AMPS] 3CX800

[Rich Measures]

>
>I'm puzzled by some bits of the data. There is a lot of emphasis on the
>600mA max. anode current, but under pulse conditions 1A for 200ms is
>allowed, 2A for 10ms and 8A max. on short pulses. If it has this much
>cathode, why the restriction at 600mA?
>
€  ... to avoid overheating and stripping the barium and strontium oxide coating from the cathode during N-zero-N operation.  For ssb, the current rating is 800mA.  .  However, this is a current which should be observed with an oscilloscope.  A reasonable workaround is to tune up with c.50wpm dits,  drive the cathode to produce c. 400mA of indicated anode current, and tune for max. P out.   In ssb voice operation, an ordinary meter indicates about 1/3 of the actual current.  Thus, the meter-indicated current during ssb operation should be roughly 270mA.   Mo' current is not mo' betta.   .  

-  later, Steve


Rich...

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


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