[Amps] 160M PI network Toroidal Coil

[Jeff Blaine]

Wow, terrible mistakes in the 2nd paragraph.  Fixed here:

"Or he will be running a data mode and without a lot of care and in that 
case, the transformer will
be at the center of a self-correction event occurring long before the coil
(of whatever construction type) is a factor."

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Jeff Blaine
Sent: Monday, October 07, 2013 2:07 PM
To: Manfred Mornhinweg ; amps at contesting.com
Subject: Re: [Amps] 160M PI network Toroidal Coil

It probably does not matter in any event.

Either the gentlemen is running CW/SSB - and in that case, whatever coil he
uses will work out FB as the duty cycle won't be much of an issue - a few
watts lost one way or the other won't be of significance.

Or he will be running a data mode and without a lot of case, the transformer
be at the center of a self-correction event occurring long before the coil
(of whatever construction type) is a factor.

73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie

-----Original Message----- 
From: Manfred Mornhinweg
Sent: Monday, October 07, 2013 12:58 PM
To: amps at contesting.com
Subject: Re: [Amps] 160M PI network Toroidal Coil

Carl,

> The T-225/225B (there is no T225-2A) size buys you absolutely nothing
> over the 200 size except a few more turns of wire of the same
> diameter.

Wrong. While the inductance per turns of the T-225 and the T-200 is the
same, the larger core will run at lower flux density when used in the
same amp, wound for the same inductance. So its volumetric loss will be
much lower. It has more volume though, so that the total loss decreases
only somewhat. But it has much more dissipation surface, so that it ends
up being able to handle significantly more power, or run cooler at a
given power level.

And the 225B size is of course much larger and very different from the
non-B size.

And at least there _was_ a 225A. It shows up in older catalogs. The
T-225A-2, as listed in an Amidon catalog from 1995, was very similar to
the current B size, only that the inner diameter was a little bit smaller.

Manfred







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