Derek:

A quick search on IEEE Explore yielded 131 hits for "pigtail."

Here is a selection of the most relevant hits:

1.    Shielding effectiveness of `pigtail' connections
Hejase, H.A.N.; Adams, A.T.; harrington, R.F.; Sarkar, T.K.;
Electromagnetic Compatibility, IEEE Transactions on
Volume 31,  Issue 1,  Feb. 1989 Page(s):63 - 68
Digital Object Identifier 10.1109/15.19908
Summary: The shielding effectiveness of a `pigtail' connection between a
coaxial transmission line and a ground plane is treated rigorously by the
method of moments, as a function of the type and number of pigtails and
frequency. Numerical results show that

 2.   A quasi-static technique for evaluation of pigtail connections
Hejase, H.A.N.; Adams, A.T.; Harrington, R.F.;
Electromagnetic Compatibility, IEEE Transactions on
Volume 31,  Issue 2,  May 1989 Page(s):180 - 183
Digital Object Identifier 10.1109/15.18787
Summary: It is shown that the analysis of `pigtail' connections between a
transmission line and a ground plane can be simplified by dividing the
problem into two parts: the radiating transmission line and the pigtail
loop. The problem need be solved only once.....

 3.   Radiation properties of a pigtail-terminated coaxial transmission line
Hejase, H.A.N.;
Electromagnetic Compatibility, IEEE Transactions on
Volume 34,  Issue 1,  Feb. 1992 Page(s):23 - 27
Digital Object Identifier 10.1109/15.121663
Summary: The method of moments is used to study the shielding effectiveness
of a pigtail-terminated shielded wire (coaxial line) above a perfectly
conducting ground plane. Numerical computations are performed in the RF
frequency range, i.e. 25-1000 MHz. Pigta.....
 5.   A comparison of unshielded wire to shielded wire with shields
terminated using pigtail and shields terminated through a conducting
elastomer
Santamaria, J.C.; Haller, L.J.;
Electromagnetic Compatibility, 1995. Symposium Record. 1995 IEEE
International Symposium on
14-18 Aug. 1995 Page(s):496 - 500
Digital Object Identifier 10.1109/ISEMC.1995.523608
Summary: Pigtails, the jumper wires used to terminate wire shields, are used
extensively in military applications. The work presented in this paper shows
that shielded wires with pigtail terminations using standard backshells are
as susceptible to external el.....

 8.   Common mode radiation from shielded cables by pigtail effect
Fang Han;
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992
Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP
Meeting., IEEE
18-25 July 1992 Page(s):1219 - 1222 vol.2
Digital Object Identifier 10.1109/APS.1992.221670
Summary: The mechanism of the radiation from a shielded cable caused by the
pigtail effect is studied. Usually, both differential mode and common mode
current in the cable could produce radiation, but the latter is the dominant
contributor. It is observed tha.....

 9.   A comparison of unshielded wire to shielded wire with shields
terminated using pigtails
Santamaria, J.C.; Louis, J.H.;
Aerospace and Electronics Conference, 1994. NAECON 1994., Proceedings of the
IEEE 1994 National
23-27 May 1994 Page(s):181 - 184 vol.1
Digital Object Identifier 10.1109/NAECON.1994.332880
Summary: Pigtails, the jumper wires used to terminate wire shields, are used
extensively in military applications. The work presented in this paper shows
that shielded wires with pigtail terminations are as susceptible to external
electromagnetic (EM) couplin.....

 16.   Radiated emission from shielded cables by pigtail effect
Han, F.;
Electromagnetic Compatibility, IEEE Transactions on
Volume 34,  Issue 3,  Part 1,  Aug. 1992 Page(s):345 - 348
Digital Object Identifier 10.1109/15.155852
Summary: Theoretical analyses and experimental results are carried out on
the common mode radiated emission from a shielded cable caused by pigtails.
Calculations of the radiation are introduced on the basis of transmission
line theory and antenna theory, and.....

Perhaps this will jog your memory on where you saw the chart.

Regards,

Jacob Z. Schanker, P.E., CPEng
65 Crandon Way
Rochester, NY 14618

Tel: 585 442 3909
Fax: 585 442 2182
[email protected]

----- Original Message ----- 
From: "Derek Walton" <[email protected]>
To: "IEEE EMC Discussion Group" <[email protected]>
Sent: Thursday, January 26, 2006 7:28 AM
Subject: Influence of Pigtails


> Morning all,
>
> many years ago, I believe the IEEE published a transaction of the
influence of shield pigtails. I've tried searching my CD ROM records, but
not found the one I'm thinking about. In it there was a chart showing the
shielding degradation of a 1", 2" 6" etc long pigtail.
>
> Does anyone recall and can point me to the transaction?
> -- 
> Cheers,
> Derek Walton
> L F Research
> Poplar Grove, IL 61065,
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