Still got more on the B&W850/850A tank inductor!
It appears to me that if you increase the value of the 10M coil on this
beast by about 1 nH, you can get a reasonable 10M Q of about 18. The
value of the coil then would be about 1.8 nH. This also gives reasonable
Qs on the other bands as well. This would dovetail with some of the
stuff Carl has said about changing the value of the 10M coil.
The only difficulty then is the fact that the 4-1000A has about 7.6 pF of
Cout. Put this in parallel with my Tune Cap's minimum C of 10 and you
have pretty much the value that is calculated for Ctune (~18 pF) (Or is
this a bad assumption? - I am ignoring the effect of the DC blocking
caps). Any more inductance to push the Q lower will result in a Ctune
value that is unobtainable.
If I wanted to push my Q a little lower, how would I accomplish this?
Should I put another cap in series with my vaccum variable?
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
http://www.qsl.net/ke9na <--- CHECK IT OUT! It's been updated!!!!!
"A life lived in fear is a life half lived."
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