I'm going to move the inductance up into the low 7's tonight and see
where
C2 works.
I'm sure a good look at a scope will also let me know whats going on, I
may have something else Happening not being detected in the
circuit..oscillations noies what not.
Chuck
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
On Behalf Of DF3KV
Sent: Sunday, October 18, 2009 9:02 PM
To: amps@contesting.com
Subject: Re: [Amps] tank calculations - need input
Yes, a Q of 7 is OK at that impedance if harmonics at only -24db are
acceptable.
Multi-Op stations are more interested in -35 to -40db.
With such low Q one should make use of Pi-L.
73
Peter
-----Original Message-----
From: jeff millar [mailto:jeff@wa1hco.net]
Sent: Montag, 19. Oktober 2009 02:43
To: DF3KV
Cc: amps@contesting.com
Subject: Re: [Amps] tank calculations - need input
If you want a Q of 12, values of about 430pf, 4.6 uH, 1900 pF do work.
But you really only need a Q of about 7 to comfortably match 1000 Ohms
to 50 Ohms. The Q of 12 rule was created in the days of higher
impedance tubes.
jeff, wa1hco
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|