Ham Radio - The 2-meter twin lead J-pole antenna.

Discussion in 'Amateur Radio News' started by KB7TBT, Oct 20, 2019.

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  1. KB7TBT

    KB7TBT Ham Member QRZ Page

    Ham Radio - The 2-meter twin lead J-pole antenna.

     
    KK5R, WY6H and K3FIL like this.
  2. W5TTW

    W5TTW XML Subscriber QRZ Page

    I have one that works very well indoors on the second floor. No joy at ground level, in or outdoors.
     
    K5MPH likes this.
  3. KV4JW

    KV4JW Ham Member QRZ Page

    Basically, it's a slim jim j-pole. They won't light the world on fire, but work well for what they are.
     
    K5MPH and W5TTW like this.
  4. KA2IRQ

    KA2IRQ Ham Member QRZ Page

    You can't beat a flexible roll-up stuff it in a bag antenna for VHF/UHF when you have absolutely nothing else. And yes, I was stuck in a storm with no power and no access to an outside antenna when I strung up a similar antenna for 2M and was able to communicate to the outside world on simplex.

    It shouldn't be your primary antenna, but it is magic when you have nothing else.
     
  5. WA2DII

    WA2DII Subscriber QRZ Page

    Great slim Jim antenna . One thing , Your SWR will change some in the PVC pipe , most people miss this point . It must be in the clear for proper
    SWR . Joe @ N9TAX.com Has much info on his home web page . Check it out . He sells them on his web 2wayelectronix.com .
     
    K4WWK likes this.
  6. K5LAW

    K5LAW Ham Member QRZ Page

    I have used these for years, both in and out of pvc. I used to hang them with a paper clip and a bit of string from the suspended ceiling in my windowless, reinforced concrete and steel first floor office. They were wonderful.
     
  7. KO6KL

    KO6KL XML Subscriber QRZ Page

    works great at FM broadcast antenna also
     
    W5TTW likes this.
  8. VE7EDT

    VE7EDT Ham Member QRZ Page

    Not sure where the Slim Jim comments come from. I think if you look closely at the top end you will discover that it's not bridged across and therefore not a Slim Jim. The isolated segment on the side above the notch has no functional electrical purpose. I built this one a couple of years ago and added a couple of ferrite beads on the coax at the feed point. I hung it in the clear between trusses in the attic and it's been working a charm ever since. Even with a few feet of snow on the roof (plywood and asphalt shingles) , hitting the local repeater or working simplex line of site around town has never been an issue, even low power on the old IC-O2AT. This antenna is well worth the small effort and nil cost it takes to build.... it's a keeper. :)
     
    Last edited: Oct 23, 2019
    KK5R, NA5XX and W7GST like this.
  9. K4FMH

    K4FMH Premium Subscriber QRZ Page

    I have a Professor Ed Fong model in the schedule 40 PVC pipe he specifies. Very surprisingly good SWR metrics when placed by a PVC T-Connector to my painters pole.
     
  10. K5MPH

    K5MPH Ham Member QRZ Page

    Dont put the antenna in a schedule 40 pvc pipe the wall thickness will mess up the swr.......
     

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