:-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-):-)
Ed Price
[email protected]
Electromagnetic Compatibility Lab
Cubic Defense Systems
San Diego, CA. USA
619-505-2780 (Voice)
619-505-1502 (Fax)
Military & Avionics EMC Services Is Our Specialty
Shake-Bake-Shock - Metrology - Reliability Analysis
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> -----Original Message-----
> From: Derek Walton [SMTP:[email protected]]
> Sent: Monday, September 27, 1999 10:37 AM
> To: IEEE EMC Discussion Group
> Subject: Cone antenna Model 93491-1 from Stoddard EMI
>
>
> Hi folks,
>
> what can anyone tell me about this antenna, characteristics, is it any
> good?
>
> Thanks,
>
> Derek.
>
> PS thanks to everyone that e-mailed me on the bond tester. We're looking
> at a solution from down under.....
>
>
>
Derek:
Just happen to have a few Stoddart data sheets. Obviously, though,
you need to calibrate the antenna, you can't trust the data sheet too far.
Stoddart 93491-1 Conical Logarithmic Spiral Antenna
Looks like a super-size ice cream cone
April 1969 (maybe as early as 1962)
1 GHz to 10 GHz
Circularly polarized (some specs require linearly polarized antennas)
Based on USAF Drawing # 62J4041
Don't put in any RF power into it (I think there is a small load resistor
right at the nose)
AF:
GHz dB
1 27
2 32.5
3 36
4 39
5 41.5
6 43.5
7 45.5
8 47.5
9 49
10 50.5
Beam width about 30 degrees (or so)
So, you can see that it's a high AF antenna. Useful for scanning in an
enclosure, and it is easily carried and pointed for direction finding. The
93491-2 is just a tad better, but not noticeably so.
Ed
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