[DSP-10] EMI suppression

[Gerry Morgan]

I am curious about the suppression of noise from the DSP-10.  In the =
TAPR kit I have 10 ferrite beads which I believe are used on the 4 coax =
cables and the power supply lead indicated in Fig 11 of the Oct 1999 =
article.  However the photographs of the boxed EZ-Kit Lite  board (page =
34 October 1999) and boxed main board (page 42 November 1999) seem to =
show many more ferrite beads.  For example the is a large diameter bead =
around the wires to the Acc Din connector and also several about the =
shielded cables going to the DB9 connector.  There also seem to be some =
on the wires to P108 and possibly elsewhere.  Are these needed and what =
ferrites are recommended?

Sorry if I am rehashing old stuff.  I had a look through the archives =
and did not see any specific discussion.

many thanks

Gerry Morgan, EI2CH



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