I have a 3101 I purchased in the early '80s. There are no visible fasteners holding the back on. Can send pictures If needed.
-Bob Sykes From: Ken Javor <ken.ja...@emccompliance.com> Sent: Wednesday, December 9, 2020 6:40 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: [EXTERNAL] Re: [PSES] Need help repairing log-spiral antenna CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. My employer back in the 70's and '80s had all three: EMCO 3101 uhf, EMCO 3102, uwave and the EMCO 3103 big uhf, but I honestly don't recall the details of the 3103 construction down to the appropriate level of detail... The back does set flush with the base of the cone. The question is what holds it there... Also the base is phenolic and the cone is fiberglass. Any adhesive experts out there with a recommendation for the proper glue? Ken Javor Phone: (256) 650-5261 ________________________________ From: Ken Wyatt <k...@emc-seminars.com> Date: Wed, 9 Dec 2020 16:22:30 -0700 To: Ken Javor <ken.ja...@emccompliance.com> Cc: "EMC-PSTC@listserv.ieee.org" <EMC-PSTC@LISTSERV.IEEE.ORG> Subject: Re: [PSES] Need help repairing log-spiral antenna Hi Ken, We used one of these (I believe from EMCO) back when I started with HP in the late 1980s. It sure seemed to me it was just glued, as I don't recall any fasteners. The joint seemed to be flush with the cone. It's long gone, so no pictures. Ken _______________________ I'm here to help you succeed! Feel free to call or email with any questions related to EMC or EMI troubleshooting - at no obligation. I'm always happy to help! Kenneth Wyatt Wyatt Technical Services LLC 56 Aspen Dr. Woodland Park, CO 80863 Phone: (719) 310-5418 Web Site <http://www.emc-seminars.com<https://urldefense.com/v3/__http:/www.emc-seminars.com__;!!KPww_GFiJXw!PbnPOuUdyC8WimrQBLNJvjNpugHep0IS7Oe673_PrFkmvBM768LCidiDaAsdFGGEMw$>> | Blog <https://design-4-emc.com<https://urldefense.com/v3/__https:/design-4-emc.com__;!!KPww_GFiJXw!PbnPOuUdyC8WimrQBLNJvjNpugHep0IS7Oe673_PrFkmvBM768LCidiDaAtwb59agw$>> The EMC Blog (EDN) <https://www.edn.com/electronics-blogs/4376432/The-EMC-Blog<https://urldefense.com/v3/__https:/www.edn.com/electronics-blogs/4376432/The-EMC-Blog__;!!KPww_GFiJXw!PbnPOuUdyC8WimrQBLNJvjNpugHep0IS7Oe673_PrFkmvBM768LCidiDaAs6jbyBVQ$>> Subscribe to Newsletter <http://www.emc-seminars.com/Newsletter/Newsletter.html<https://urldefense.com/v3/__http:/www.emc-seminars.com/Newsletter/Newsletter.html__;!!KPww_GFiJXw!PbnPOuUdyC8WimrQBLNJvjNpugHep0IS7Oe673_PrFkmvBM768LCidiDaAuTvMUAbQ$>> Connect with me on LinkedIn <https://www.linkedin.com/in/kennethwyatt/<https://urldefense.com/v3/__https:/www.linkedin.com/in/kennethwyatt/__;!!KPww_GFiJXw!PbnPOuUdyC8WimrQBLNJvjNpugHep0IS7Oe673_PrFkmvBM768LCidiDaAvo-nj9XA$>> On Dec 9, 2020, at 4:04 PM, Ken Javor <ken.ja...@emccompliance.com> wrote: Need help repairing log-spiral antenna List Members with an EMI test facility, Recently purchased subject antenna, which is damaged. See attached image. Tensor made the EMCO log-spirals before EMCO acquired them, way back. I had an opportunity to buy the antenna in the image, and it is the same as an EMCO 3103. Unfortunately, they packed it up like it was indestructible, and it wasn't - the box was intact, but the antenna within had come apart as can be seen. The back plate was originally glued in, but there are also holes for fasteners, visible in the image. None of the fasteners were in the antenna or even in the box. It could be that the fasteners were only there during assembly to hold the back plate in place long enough for the glue to set. I got with ETS/Lindgren to see assembly drawings for their log-spirals, but that hasn't been fruitful. I am reaching out to the list membership for a description of how the EMCO or ETS/Lindgren 3101 or better yet EMCO or ETS/Lindgren 3103 is put together. The main question is whether or not there are any fasteners, and if so, metal or nylon, or? Also any evidence of glue, or how the back plate stays in place. I have two uhf log-spirals like the EMCO 3101, but one is from Electro-Metrics, and the other Stoddart/Singer, and neither show any evidence of what holds them together, plus it wouldn't necessarily apply, anyway. If there are fasteners, a close-up image would be really helpful for me to figure out what I need to get. Thank you, Ken Javor Phone: (256) 650-5261 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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