plate choke and blocking cap

[Crusher]

I have question, I was told that there is a formula for figuring out the value of a DC blocking capacitor in relation to the impedance of the plate choke. Does anyone know what the formula is? I always figured a 500 to 1000pf was enough. But after hearing this, I wanted to get it right or at least be on the right track. If anyone could point me in the right direction, it would be greatly appreciated.

 

[paws264]

Crusher, are you a member of the Yahoo Group, "Ham Amplifiers" or, the Amps Reflector, you can pickup some info there.

Xc for .01Uf @ 27 Mhz is is like 1 ohm, IMO for single band operation the inductance value of of the plate choke is in critical, just make sure to pile enough turns on there.

Yes, you can get the computer modeling programs that analyze your circuit and reports the critical values down to 3 decimal points but *I* don't think whatever small percentage of effiecency gained or lose will be noticed 1000 miles away on the other end.

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[Crusher]

OK, thanks paws. Not a member yet but I will be checking them out. Like I siad, after finding this out, I wanted to dig more into this. I think bob85 said it best. It's all about the learning.