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Base PDL II

Discussion in 'CB Antennas' started by 357, Mar 26, 2018.

  1. 357

    357 Walkin' the dog

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    Found this and a Model GN18S Golden Nugget tower with a ham 2 looking rotor on a baseplate for $60

    The reflector was intact laying up behind a shed in the backyard.
    Can anyone date the white insulators?
    Thankfully they used stainless back in the day.

    Its just dirty, not rotted at all.
    Whad'ya guys think?







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  2. Jay Mojave

    Jay Mojave Active Member

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    Yo 357: Looks like a modified Avanti AV-122 PDL-II, that came out in and around 1972 I believe. Or is the antenna called a Golden Nugget in your photos? Hard to tell a lot from your photos.

    The white insulator or the other Hubs doesn't look like anything I've seen before on a PLD-II Quad Antenna. They look like that have been modified or replaced as the Hubs were and are the weak link to the PDL-II, Moonraker 4 and 6 beam antennas, and the AV-190 and AV-170 ground plane antennas.

    The elements being flattened to be bolted on the replaced Hub look like a home brew job, not a factory issue. This PLD-II antenna can be reassembled, the assembly instructions are on:
    http://www.cbtricks.com/ant_manuals/avanti/av122/index.htm

    The Avanti Aluminum Hubs were a cast Aluminum material that some times broke during assembly new out of the box. The bolt that tightens the Hub to the mast would crack and break the Aluminum Hub. Avanti when in business would replace them free as they knew the design was terrible. Someone's pipe dream of making cheap parts for cheap for mass production that made the noted antennas become obsolete and scrapped before there time.

    New Metal Hubs can be easily machined from billet aluminum at a cost of about 40 to 60 dollars a pair, plus machine set up. The Insulator Hub can be made from Teflon or Dilrin or even Phenolic materials.

    The PDL-II Quad Beam Antennas worked pretty good, and would take a fair amount of bad weather.

    Jay in the Great Mojave Desert
     
    357 likes this.
  3. 357

    357 Walkin' the dog

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    Thanks, Jay.
    Wow ok I see what you mean now.

    357 up around Vancouver, Canada, wavin'

    73
     
  4. 357

    357 Walkin' the dog

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    ShadeTreeMechanic likes this.
  5. 357

    357 Walkin' the dog

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    Attached Files:

    #5 357, Mar 27, 2018
    Last edited: Mar 27, 2018
  6. 357

    357 Walkin' the dog

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    Looks like I'm gonna replace the boom.
    The reflector was the greenest looking cause it was under a tree behind a shed after it fell off.
    (thank goodness someone stashed it)

    I'll do the so239's and the muffler clamps as well.

    The hubs are heavy and feel like they are made of bone....not sure what they are.
    The alum. hub is just a square block.
    The driven elements are 80" each, hopefully thats right and not cut for another band.
     
  7. Jay Mojave

    Jay Mojave Active Member

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    Hello 357: Yeah the 80 inch long element length sounds right, for the CB Band. The Instructions say to mark the 48 inch long fiber glass rods at 43 11/16 or 43.6875 inches, and install them into the 5/8 tubing, this added with the 36 inch long 5/8 aluminum tubing comes to 79 11/16 or 79.6875 inches measured from the fiberglass tip center of the hole to the end of the aluminum tubing. So end to end 80 inches sounds pretty close.

    See the link I left you in the first reply, its the assembly instructions with all the lengths and such.

    They used 14 gauge cheap wire for the quad elements, again ok for saving money in a mass produced product, but not for "Bitchen" antennas guys. I use 10 gauge wire the good stuff so that is will better resist stretching over the years. Amidon has it, its called Thermaleze-Coated Magnet Wire its bullet proof and has a very tough insulation that will need to be scrapped off and solder tinned.

    Your metal Hubs being a solid piece of aluminum are just fine, the insulated Hub looks like it was possible made by Avanti in early models, or someone had them made.

    Rebuilding the old Moonraker 4 and 6 element beam antennas, I used custom made Hubs that had a 2 inch hole allowing a 2 inch Mast to be used, adding strength for a much longer beam antenna. Those with the original equipment of the cast aluminum Hubs need to be very careful when tightening down the bolt that holds them onto the mast. As time will allow for corrosion and cracks. Using a solid piece of aluminum for the Hub will work very well as you have, the 5/8 inch element could have a 1/2 inch solid piece of aluminum rod installed to allow them to have the bolts go thru them without the bolts flatting them when tightened.

    Jay in the Great Mojave Desert
     
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  8. 357

    357 Walkin' the dog

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    I might have found the guy that rebuilt the antenna in the 90's.
    I sent the pictures and he's pretty sure it is his old one.
    He said the insulating hubs are fiberglass and to spray some sealer on them.
    He mentioned magnet wire and also mentioned avanti saying to use braided wire...
    I'm gonna get a boom pipe thats a thicker wall.
    He said the bolt rocking back and forth cut a few moonrakers in half.
    He said he mad the rounded orbital pieces by filling them with sand and bending them on a car tire
     
    ShadeTreeMechanic likes this.
  9. 357

    357 Walkin' the dog

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    #9 357, Mar 28, 2018
    Last edited: Mar 28, 2018
  10. 357

    357 Walkin' the dog

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    Anyone know where to find gamma match's besides ebay?
    I dont need 10k and $120 Canadian is bullshit


    nevermind I'll buy some ptfe pipe and cut the old one off.
    Sparkplug wire boots are easy to find too.

    2017036.jpg 2017037.jpg
     
    #10 357, Mar 28, 2018
    Last edited: Mar 28, 2018
  11. 357

    357 Walkin' the dog

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    A utility knife and I got them apart.
    The white corrosion made it impossible other than cutting the teflon.

    some sos, 2000 grit and they look great

    IMG_2903.JPG
     
    #11 357, Mar 28, 2018
    Last edited: Mar 28, 2018
  12. Jay Mojave

    Jay Mojave Active Member

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    Hello 357: Yeah those wire call outs will work just great, I have used the 12 gauge black multi strand wire several years ago.

    The Gamma Matches should be able to be salvaged, I think, never tried. The Moonraker 4 and 6 element beam antennas I modified were made longer, stronger, and the Gamma Match was replaced with a insulated split Hairpin Matching system.

    The smaller aluminum tubing can be anielded, or heated up and easily bent. The 6061 T6 and 6063 T832 are not recommended to be bent, but the smaller diameters ( 1/2 and 3/8 inch diameters ) can be bent easily.

    Jay in the Great Mojave Desert
     
  13. murdog

    murdog Member

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    Hello 357 ,
    Good to see another west coaster out there if you find another pdl down there let me know have been looking for a while and good luck with yours you will enjoy it .
    Mur , Summerland B.C
     
  14. 357

    357 Walkin' the dog

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    murdog likes this.
  15. DXman

    DXman Well-Known Member

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    Hello 357,
    When you get that ant. working, swing it south down here to Mt. Vernon on the horizontal. Then maybe we can connect instead of having to do it on back-scatter.

    Also give Big Jay (373) a big hello from me.

    Larry - 178
     
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