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

Good day all.

William - Many years ago I had to do similar measuremets in order to
convince some department or other that one could acually design an HF
antenna using various digital and other design tools. At the time we did
not have access to the sort of facilities you are talking about. The
mesurements were a bit of a pain, but successful in the end. The effort was
written up in

DC Baker; 'A limited comparison of predicted and measured results for an HF
ground-arrayed logperiodic dipole array', Applied Computational
Electromagnetic Society Journal, Vol. 5, pp. 25-38, 1990.

Best regards,

Duncan Baker.

<ghagn_at_erols.com> writes:
> 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
> >
> > --
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> > http://www.gweep.ca/mailman/listinfo.cgi/nec-list
> >
>
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