[Amps] Amplifier Input Circuit Consultation

Radio WC6W wc6w_amps at yahoo.com
Thu Oct 23 14:02:19 EDT 2008

Hi Wayne,
  A 1:2 balun will provide a 4X impedance step up: 50-200 ohms.

  You'll have to wind something a bit on the special side for a 1-2 impedance ratio.

73 & Good morning,
  Marv WC6W 


--- On Thu, 10/23/08, n1wr at chesapeake.net <n1wr at chesapeake.net> wrote:

> From: n1wr at chesapeake.net <n1wr at chesapeake.net>
> Subject: [Amps] Amplifier Input Circuit Consultation
> To: amps at contesting.com
> Date: Thursday, October 23, 2008, 10:03 AM
> I continue to work on the design/construction of my 4-1000
> amplifier.  I'm
> working on the input network details.
> The 4-1000 has a generally accepted input impedence of 100
> ohms.  So I am
> planning on using a 2:1 step up unbalanced to unbalanced
> balun followed by
> a parallel tuned circuit, Q of 2-3, for each band.  Taking
> this approach I
> will need only one relay contact per band to switch each
> tuned circuit (as
> opposed to two needed to switch a pi network).
> In all of my reading and research I haven't seen this
> approach taken.  The
> grid compartment is under construction.  Before I go ahead
> and construct
> the input this way - can anyone come up with a reason this
> won't work?
> I thoroughly enjoy this list and faithfully tune in to the
> goings on.  I
> really appreciate the help and support that is provided.
> Wayne N1WR
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