[NLRS] Alford slot antenna formulas?

[Baker, Donn B]

Scott,
The best place to start is Paul Wade's Online Antenna Book <http://www.w1ghz.org/antbook/contents.htm>, Chapter 7.  

Kraus (Antennas, Chapter 14)gives the dimensions for slotted cylinder antennas as D=0.125 wavelength; L=0.75 wavelength; and slotwidth of 0.02 wavelength.  Other slot antennas (i.e., slot in a flat sheet) are covered in Chapter 13.

The pointers Jim, K0MHC, gave appear to be very good if you're looking for those frequencies.  Even if not, they can be used to check the dimensions given by Kraus at specific frequencies, or by W1GHZ in his stuff.

I've got Kraus (and some of the MIT Rad Lab books), and can make copies of stuff if you need it.

Good luck.

73 Donn
WA2VOI/0

-----Original Message-----
From: nlrs-bounces at mailman.qth.net [mailto:nlrs-bounces at mailman.qth.net] On Behalf Of Scott
Sent: Thursday, November 02, 2006 6:14 AM
To: NLRS List; Chippewa Valley VHF
Subject: [NLRS] Alford slot antenna formulas?



After searching through many search pages, I have not been able to find formulas for calculating dimensions (tube diameter, slot width, slot length--well length of slot has been indicated as 1/2 and 2 wavelengths, etc.).  I would assume that the circumference of the tube would be something like 1 wavelength (but the published measurements I did find for a couple bands don't seem to corroborate that!) since most of the theory I found indicates you treat the alford slot as an infinite number of horizontal loops all stacked on top of each other (yea calculus!). 
Anybody have any more info on these antennas?

--
Scott N0EDV
http://corbenflyer.tripod.com/
Building RV-4
Gotta Fly or Gonna Die
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