On Wed, 27 Apr 2005 09:57:24 -0400, "Edward A. Feustel"
wrote:

|
|"J. Mc Laughlin" wrote in message
...
| The tuner described seems to be electrically what MFJ is now selling as
| their balanced tuner.
|
| 73 Mac N8TT
|
| --
| J. Mc Laughlin; Michigan U.S.A.
| Home:
| "RB" wrote in message
| . ..
| There's a couple of them to be found on this web page:
|
| http://www.somis.org/
|
|
|
|
|
|If I understand correctly, the MFJ tuners have double balanced T networks
|and
|not double balanced Ls. The double balanced L has a number of advantages
|over
|the double balanced T, especially if the capacitor can be moved from input
|to output,
|e.g., the new Palstar or the Bliss tuner. This provides a low pass effect as
|well.

The L network can be either low or high pass. It also has the
disadvantage that the loaded Q is set by the transformation and is out
of the control of the designer/user. With a tee or other network with
greater than two reactances, the loaded Q can be set by the design and
can provide lower loss and less critical tuning under some conditions.

|Since on the MFJ, the inductor is the shunting element, this is a high-pass
|network and
|helps to encourage harmonics.

Well, maybe "doesn't suppress" harmonics is a better way to put it.