All this is interesting. During my time working at colocated AMs and
doing hundreds of remotes on sat trucks, I don't remember having to
connect the shells of an xlr to pin 1 to eliminate external pickup.
George Washington Bridge seemed to work well.
Don W4DNR
On 2023-04-23 1:19 pm, Jim Brown wrote:
On 4/23/2023 9:43 AM, jim.thom jim.thom@telus.net wrote:
ALL of my XLR cables I fabricated myself, were 1 pair, twisted, and
teflon
insulated..and a woven braid, then the outer pvc sheath...(surplus
telco
cable we tossed at work).
Jim,
AES Standards, like all REAL Standards, are produced by engineers
working in a very broad cross-section of the industries who will use
those Standards. Your application is but a pimple on the elephant. The
company whose advice you quote, while the designer of truly
excellent-sounding dynamics processing (for its time) for broadcasting
and broadcast production, also sells products with SCREAMING Pin One
Problems, one of which was among several I tested in the VHF-UHF-rich
environment of downtown Chicago. With properly wired test cables, its
RF susceptibility made it un-useable. This 2003 AES Paper documents
that work. http://k9yc.com/AESPaperNYPin1-ASGWeb.pdf
This AES Paper documents corresponding work on condenser mics from
Neumann, AKG, Sennheiser, and Shure. Although not identified by name,
the worst offender was Neumnann, the best was Sennheiser. When I showed
this to the AES Standards Working Group on mics, which included
members from those companies and others, I did identify them. The
amusing part was that Sennheiser had by then acquired Neumann, but
their engineering groups were independent operations.
http://k9yc.com/AESPaperNYPin1-ASGWeb.pdf
The digital revolution has drastically changed audio signal
distribution for large scale production in the years since AES analog
Standards were written, but the stated practice was absolutely
essential when, for example, in medium to large scale music
performances two 32-64-input mix desks, usually at widely separated
locations, are producing separate mixes from the same mics -- one for
the audience, another for performers on stage. And there are direct
feeds from amplified instruments like keyboards, guitar, and bass, that
feed their own amps running on stage power. If the production is being
broadcast or recorded, a third mix in a truck is producing that mix. In
addition to their physical separation, the truck will have it's own
power feed. Those separate mix desks within the facility, or with a
touring company, were often NOT from transformer isolated splits. AES
Standards are written so that those applications are viable.
73, Jim K9YC
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