[Amps] Alpha 77dx L5 help

[Michael Tope]

FWIW, the pertinent technical data for the Micrometals #2 Iron Powder 
material mix (relative permeability, mu = 10) can be found here:
https://www.micrometals.com/products/materials/-2/

If you look at W6SAI's "Radio Handbook", a stack of two or three T200-2 
cores is specified as part of the PI-L networks in several of the HF 
amplifiers described therein.

73, Mike W4EF...................

On 12/4/2024 2:56 PM, jim.thom jim.thom at telus.net wrote:
> Date: Tue, 3 Dec 2024 11:37:43 -0800
> From: Jim Brown <jim at audiosystemsgroup.com>
>
>
> Fair-Rite makes at least 20 different ferrite materials, each tweaked
> for specific and often very different performance characteristics for
> product applications. They range from large and small power handling
> over various frequency ranges (think power supplies, controllers), to
> linear RF small and large power and frequency ranges, to EMC
> suppression, again in various frequency ranges and power handling.
>
> The Fair-Rite catalog, something like 300 pages, can be downloaded from
> their website as a pdf. To find it, click on something like order a
> catalog, and poke around until you find the link. It is VERY detailed,
> with a ton of engineering data. It's possible to learn a LOT about
> ferrites from studying it. The first 30-40 pages have detailed data on
> each mix, much of it in the form of plots.
>
> 73, Jim K9YC
>
> ####  L5 is powdered Iron,  #2 mix (red core, MU=2)..... and L5 is used
> only on 160m.