Re: NEC-LIST: HF Antenna test facility, capability

Thanks for the referral to the XELEDOP and RELEDOP systems I helped develop
at SRI International. The XELEDOP system, as it existed in the early 1970s,
was discribed in an article I had Gary Barker (now deceased, but then my
system engineer for XELEDOP) write for a special issue on antenna
measurements of the IEEE Trans. AP, July 1973. The RELEDOP system is
described in a paper in the IEEE Trans. Broadcasting, June 1988, which I
coauthored with Roy Stehle, then my RELEDOP system engineer (but now
retired from SRI). SRI no longer has the capability to do the XELEDOP
(transmit in the air) or RELEDOP (receive in the air) HF full scale pattern
measurements, but I am cranking that capability back up. I would be glad to
discuss this with anyone interested in MF, HF, VHF or UHF full-scale
airborne pattern and absolute gain measurements.

George Hagn
Hagn Associates Ltd.
4208 Sleepy Hollow Road
Annandale, VA 22003-2046

703-941-7663 tel/fax

P.S. I am going out on a field measurement trip to Eglin AFB on a
DARPA project on Friday AM and will be back in about a week.
Original Message:
-----------------
From: Jacob Schanker schanker_at_frontiernet.net
Date: Tue, 4 Nov 2003 17:26:03 -0800 (PST)
To: nec-list_at_gweep.ca
Subject: Re: NEC-LIST: HF Antenna test facility, capability

William:

If you are serious about full-scale gain and pattern measurements of a large
HF antenna or array, you ought to contact SRI International (Menlo Park CA).
Their helicopter-towed Reledop and Xeledop systems may meet your
requirements, but not inexpensively. (Look at:
http://www.erg.sri.com/telecomm/antenna.html). One of the British Aerospace
subsidiaries in the US may also have suitable facilities.

HF gain measurement is often done by substitution - comparison with a
reference antenna, often a half-wave dipole. Other approaches include scale
model measurements, and, of course, NEC.

Regards,

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

Tel: 585 442 3909
Fax: 585 442 2182
j.schanker_at_ieee.org

"Killen, William" <wkillen_at_harris.com> writes:
> We are looking for a facility and capability to measure the gain of an HF
> antenna, 3-30 MHz. Does anyone know if and or where and who to contact to
learn
> more about any such facility or capability.
> thanks
>
> --
> The NEC-List mailing list <nec-list_at_gweep.ca>
> http://www.gweep.ca/mailman/listinfo.cgi/nec-list
>

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