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Inside the T1500-series Cavities Photos by Jim Gifford K9AGR Compiled by Robert W. Meister WA1MIK Additional text by Kevin Custer W3KKC

Click on any photo for a larger view.

The pass-band coupling loops and color-coded SO-239 jacks are installed in the holes closest to the tuning knob. The loop orientation determines the insertion loss. The notch coupling probes and SO-239 jacks are installed in the holes furthest from the tuning knob. The far end of one probe or loop is mounted in a fixed hole, while the other mounts to a slotted hole and can be adjusted.

These four photos are of a cavity with notch coupling probes. These wires are about 1/4 to 3/8 inch above the side of the cavity. The probe on the left is mounted to the fixed hole; the probe on the right is mounted to the slotted hole.

Here's one of the probes and SO-239 jacks removed from the cavity.

The next five photos are measurements of the coupling probe. They are identical except for being bent in the opposite direction.

Alan Beard VK2ZIW posted an inside view of a cavity with the coupling loops. These are also arranged with one loop in a fixed location (on the right) and the other in the movable slot (on the left).

Much more information, including the T1500-series cavity documentation, can be found here.

Contact Information:

Kevin and Bob can be contacted here.

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This web page created 19-May-2020

This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.