In this case the term “shield” has been overloaded and has nothing to do with
coaxial cable. It is simply the term for an Arduino add-on board. Similarly,
Beaglebone’s have capes, and others name their boards with unique names.
- Jack, W6FB
> On Mar 2, 2016, at 9:50 AM, Jim Brown <k9yc@audiosystemsgroup.com> wrote:
>
> On Wed,3/2/2016 7:35 AM, Katsuhiro Kondou wrote:
>> I have a plan to use an audio shield (velleman KA02) using ISD1700 for
>> Arduino.
>> Builtin switches on the shield will not be used, and it will be controlled
>> via
>> USB serial so that logging software can handle.
>
> A cable shield must NEVER be connected to anything but the shielding
> enclosure at the point of entry. Putting that another way, a cable shield
> must ALWAYS be connected directly to the shielding enclosure at both ends.
> Anything else is a source of hum, buzz, and RFI.
>
> Yes, I know that nearly all ham rigs fail to do this, but the manufacturers
> are WRONG. For engineering analysis of this, see my tutorials on "The Pin One
> Problem" on my website, also the AES Papers on my website, and the tutorial
> appendix to AES48, which can be downloaded from the AES Standards website
> (but not free).
>
> 73, Jim K9YC
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