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 Author  Topic: SO Radar Antenna Housing
David Waples

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of David Waples  Posted on: Jul 14, 2020 - 8:29pm
Thats was 2012? Aye carumba! Where has the time gone?

David Waples

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Jeff D

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Jul 15, 2020 - 1:56pm
Hah David, indeed.

I remembered a discussion we had about differences in SO radars and masts, found it: http://www.ptboatforum.com/cgi-bin/MB2/netboardr.cgi?cid=101&fid=102&tid=4225



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Stearman

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Stearman  Posted on: Jul 15, 2020 - 8:31pm
Reminds me how sad it is, that Photo Bucket destroyed a big chunk of the internet!


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Jeff D

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Jul 16, 2020 - 6:42am
Yes they did, and without much warning if I remember right.



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pbudzik

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of pbudzik  Posted on: Aug 18, 2020 - 5:48am
Thanks again to everyone for your help. Here is what I finally came up with.

jg97M.jpg


Paul


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Jeff D

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Aug 19, 2020 - 5:07am
Looks good Paul.


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pbudzik

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of pbudzik  Posted on: Sep 12, 2020 - 1:38pm
Here is a link to a short video showing how I constructed the radar unit ...

https://www.youtube.com/watch?v=3_6dqM4wRLI

Paul


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Jeff D

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Sep 14, 2020 - 3:45am
Nicely done video Paul, and thanks for the shout out to the forum and my website!



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  Jerry Gilmartin

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jerry Gilmartin   Send Email To Jerry Gilmartin Posted on: Sep 14, 2020 - 9:10pm
Wow Paul! I was glad to see you took the photos I posted of the PT658 Radar mast and made such an awesome replica of it! Just FYI, this authentic radar mast was obtained on loan from the PT Boat Museum in Fall River, Mass. We believe it had been mounted on an Elco 80footer before we obtained it, due to the shape and configuration of the Mounting Brackets. Apparently the mast on an Elco would hinge down at an angle (off center) and not lay back flat like on a Higgins boat. When we mounted the mast, we had to reposition the hinge pins inside of the foot brackets so it would lay back flat. You can see these brackets have a lot of different holes in them so it may have been by design? One small detail that you may or may not want to change is the two small yardarms. On our actual mast they are attached to the outside of the mast legs with a quaint little triangular plate. This plate is screwed to the surface of the legs and holds the yardarm perpendicular to its surface. The overall effect is they are slightly tilted (or swept) upwards from the horizontal plane. I realize this is really getting nitpicky here! So to simulate this you may want to bend the yardarms upwards just a hair, so they are perpendicular to the outer surface of the leg. Also, another slight misnomer is the big box on the base is not really called a rectifier. It is properly termed the Signal Generator. It consists of a great big transformer inside and some capacitors and rectifiers, and basically creates a large pulse of RF energy. This RF is directed up to the Antenna through the hollow 2x4 shaped wave guide. It is very similar to a rain gutter downspout, except it in real life is a hollow rectangular steel tube. Anyway that is what the RF Signal Generator does. (The Radar set does indeed have a Rectifier, but it is part of the power supply and is located down below deck.) I am really amazed by your extraordinary skills and am happy to have been able to be of assistance in some small way to your masterpiece!

Thanks again and keep up the amazing work!
j6wrj.jpg
j6bl6.jpg



Jerry Gilmartin USS PT658 Crewman and Restoration Volunteer.

Jerry Gilmartin
PT658 Crewman
Portland OR

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Jeff D

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Post a Reply To This Topic    Reply With Quotes     Edit Message     View Profile of Jeff D   Send Email To Jeff D Posted on: Sep 15, 2020 - 2:28am
Thank you Jerry, I've never picked up on the Higgins mast folding straight back or the slight angle of the yardarms.

I hope you're not in harm's way of amy of the monstrous fires going on out there...



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