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Thread: sigma 4

  1. #11
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    Yeah I would think that wooden dowels in all the joints would just add a lot of weight. Only way to truly make one more robust is to build it with heavier gauge aluminum. They are a great antenna, just not made for windy areas. Just my experience with the one I have.

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    Mike5511 (12-24-2017)

  3. #12
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    you can do some changes on them if you like .my friend has one and he does that .like the gamma rod and some other changes on it
    telecommunication consultant

  4. #13
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    Quote Originally Posted by source View Post
    you can do some changes on them if you like .my friend has one and he does that .like the gamma rod and some other changes on it
    I'd be interested to know what the changes are. I've got one I've never taken out of the box yet. Is that tape on the joints or heat shrink?
    Last edited by Mike5511; 12-25-2017 at 06:51 AM.

  5. #14
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    I used heavy duty heat shrink on all of my joints. Don’t know if it does much. But it’s not heavy and seems to give the vertical whip some rigidity over just screwing it together. Booty Monster is the one to speak to about these antennas. He has done a lot of experimenting with them. There is also a company that sells a beefed up version of the vector 4000. It’s not cheap though!!! Can’t remember at the moment who that was. It I did see them for sale. They were quite heavy as well. A great antenna for both local and DX. But if you live in an area with inclement weather and high winds, you may want to look into something like the Shockwave antenna made in the USA. Just my thoughts.

  6. #15
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    Quote Originally Posted by 222DBFL View Post
    I used heavy duty heat shrink on all of my joints. Don’t know if it does much. But it’s not heavy and seems to give the vertical whip some rigidity over just screwing it together. Booty Monster is the one to speak to about these antennas. He has done a lot of experimenting with them. There is also a company that sells a beefed up version of the vector 4000. It’s not cheap though!!! Can’t remember at the moment who that was. It I did see them for sale. They were quite heavy as well. A great antenna for both local and DX. But if you live in an area with inclement weather and high winds, you may want to look into something like the Shockwave antenna made in the USA. Just my thoughts.
    I've had one for a couple of years. Just never have put it up. I figure I'll go ahead use it since I already have it.

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    222DBFL (12-25-2017)

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    I loved that Sigma 4. What range and high takeoff angle, perfect for skip. Wooden dowels? I would be more inclined to put heat shrink tubing on all the joints where possible. I have tried anodizing and it looks nice but the joints need to be cleaned of the deposits before assembly.

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    222DBFL (12-28-2017)

  10. #17
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    i dont purchased the vector 4000 yet but i love ready made ant .because of it light weight.what i have been told they made over the gama rod using hot water pipe .using a longer lenght so what it does is cover more part of the band and also more watts ok .i can get the measurment for you ok .and a little bit more lenght on the vertical .the one you see in the picture above i made that one sigma 4 homemade built
    telecommunication consultant

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    Mike5511 (12-30-2017)

  12. #18
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    Quote Originally Posted by source View Post
    .what i have been told they made over the gama rod using hot water pipe .
    don't know %100 , but i'd bet they don't use water pipe for the gamma . they may use something chemically similar to PEX for the insulator in the gamma though . many folks/hams have used PEX for insulator material in gamma matches and i have also and it does a fine job . it's not electrically conductive and won"t absorb moisture .

    IMO if you're concerned about the weather durability of the 4K and WILL NOT build a stronger version from scratch just get a gainmaster . unless you're running north of a kilowatt or more .

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