[Johnson] Re: "L"vs."T" tuner circuits

Sat, 16 Nov 2002 19:09:28 -0500

An L network may be a high pass filter or a low pass filter. It depends on
it's configuration. And it's configuration depends on what you are trying to
match to what.

An L network can be more efficient than the T as you can have higher
circulating currents in the T with the compromise that it is. It is a trade
off between simplicity and having to swap connections with an L to obtain wide
range coverage.

73
Gary  K4FMX

W2WU wrote:

> All comments overlook that a "T" network can and will degenerate into a
> Hi-Pass Filter. That Brodcasters usually use a "L". -W2WU
> ----- Original Message -----
> From: Gary Schafer <[email protected]>
> To: kwylow zinjanthropus <[email protected]>
> Cc: <[email protected]>; <[email protected]>
> Sent: 14 November, 2002 15:39
> Subject: [Collins] Re: [Johnson] Advantages/disadvantages of an "L" tuner
> circuit?
>
> > You can match almost anything with an L network and it can be a little
> more efficient than the T network. However the T network is much more
> versatile. With an L network you will at times have to change it's
> configuration depending on what you are trying to match. There are about a
> half dozen configurations of the L network. Series C
> > on input parallel L on output. Series C parallel L on input. Series L
> parallel C on output,  etc.
> > The T network eliminates the need for changing the configuration at the
> expense of not always being optimum but being able to match a much wider
> range without making changes to the configuration.
> >
> > 73
> > Gary  K4FMX
> >
> >
> > kwylow zinjanthropus wrote:
> >
> > > All:
> > >
> > > Just took a look at Ten-Tec's lineup. I was surprised that they show
> their tuner using an "L" configuration for matching. I was considering
> building a 1KW tuner and if TenTec chooses an L designed, I figured "why
> not". Can anyone convince me either way? Oh, so that the topic is not off
> subject: it's for my Collins and Johnson rigs
> > >
> > > 73 de Cal, N6KYR
> > >
> > > ---------------------------------
> > > Do you Yahoo!?
> > > Yahoo! Web Hosting - Let the expert host your site
> > >
> > > --- StripMime Report -- processed MIME parts ---
> > > multipart/alternative
> > >   text/plain (text body -- kept)
> > >   text/html
> > > The reason this message is shown is because the post was in HTML
> > > or had an attachment. Attachments are not allowed.
> > > Please post in Plain-Text only.---
> > > _______________________________________________
> > > Johnson mailing list
> > > [email protected]
> > > http://mailman.qth.net/mailman/listinfo/johnson
> >
> > Sponsored by the Collins Radio Association
> > http://www.collinsra.com