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## Re: [Amps] XCVR Output vs. Amplifier Input Impedence

 To: Re: [Amps] XCVR Output vs. Amplifier Input Impedence "Wayne Rogers" Sun, 9 Mar 2008 13:37:58 -0400 mailto:amps@contesting.com>
 ```This discussion about the output impedence of a solid state transceiver has some bearing on my current problem. I am beginning to build a 4-1000A G-G linear (I know - old technology, but thems the parts I have). I am trying to figure out the best approach for coming up with an input network. My research to date says that the impedance varies snywhere from around 25 to 200 ohms, frequency dependent, and I would guess is dependent on some of the input components (like the bifilar choke on the filaments). So how do I approach the design? I am planning on a pi-network with a Q of 3 or so. The values are easy to calculate if I know the tube input impedence, but I don't. I could design for 100 ohms and hope for the best? Also, with a low Q I'm expecting to have only one of the three pi-network components variable, but which one? What has your experience been? I am building this amp for the low bands - 160 - 40, so I won't have to deal with the problem of making a 4-1000 play on ten meters. Any input appreciated. Thanks in advance. Wayne N1WR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps ```
 Current Thread Re: [Amps] XCVR Output vs. Amplifier Input Impedence, Wayne Rogers <= Re: [Amps] XCVR Output vs. Amplifier Input Impedence, Gary Schafer Re: [Amps] XCVR Output vs. Amplifier Input Impedence, Jim Brown Re: [Amps] XCVR Output vs. Amplifier Input Impedence, Gary Schafer Re: [Amps] XCVR Output vs. Amplifier Input Impedence, Radio WC6W