[Elecraft] TI Shield

[Bill Tippett]

         Sometime this month several mentioned the problems of
EM fields causing phase noise problems with the K2's PLL.  This
might be worth investigating for any who are having this problem.

                                 73,  Bill  W4ZV

TI SHIELD: Unique composite shielding material from Texas Instruments for 
blocking EMI & RFI interference. Conventional
shielding materials excel either in electrical conductivity or magnetic 
permeability, but not both. Steel is not conductive enough
to be effective at blocking high frequencies, while copper and aluminum are 
not effective at absorbing low frequency EMI. No
single material met both of these requirements until TI developed this 
copper/alloy 49/copper composite material. TI Shield is
effective from below 10Hz up to 10GHz and is currently available only in 
.014" thickness. Counterpoint utilized similar technology
in construction of their chassis' and found significant audible benefits 
were to be derived from surrounding audio circuitry
with materials that shield against both EMI & RFI. MicroSorb (pg. 18) could 
be used to adhesive back this material and provide
mechanical damping of the chassis as an additional benefit. Unlike 
Mu-Metal, this material may be cut and bent into convenient
shapes without requiring annealing to restore its shielding properties. 12" 
x 12"/$27.95, 12" x 24"/$54.50

http://www.percyaudio.com/Catalog.pdf (page 14)