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Author Topic: Need Hubs Avanti Moonraker 4 for use on 10 meter.  (Read 3558 times)
KD0TLI
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Posts: 42




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« on: November 24, 2012, 06:40:01 PM »

I aquired a new-in-the-box antenna, but no hubs.
Anybody have some ?

I'd like to convert for 10 meter...

Thanks for any info you may have.
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N8CMQ
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Posts: 355




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« Reply #1 on: November 24, 2012, 07:13:04 PM »

??Hubs??
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KD0TLI
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Posts: 42




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« Reply #2 on: November 24, 2012, 07:19:36 PM »

??Hubs??

Yes hubs.....the (4) hubs the elements attach to.
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MAGNUM257
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Posts: 159




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« Reply #3 on: November 24, 2012, 08:29:05 PM »

I aquired a new-in-the-box antenna, but no hubs.
Anybody have some ?

I'd like to convert for 10 meter...

Thanks for any info you may have.

I've seen them on Ebay but just did a quick look and none listed right now. You might look at Cubex Quad, look at the spreaders on the bottom of the page...

http://www.cubex.com/hard.htm

...if they will fit your boom diameter.

-chuck
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KD0TLI
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Posts: 42




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« Reply #4 on: November 25, 2012, 07:21:22 AM »

Chuck - thanks for the post.

That may be an option...but a pricey one.
I may have to find someone who has a tig welder......and make my own.
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HAMFESTS
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Posts: 34




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« Reply #5 on: November 25, 2012, 07:39:54 AM »

Try this place and see if the Maco Quad hubs will work

http://www.antennapartsoutlet.com/

or the direct link to the parts page for Maco hubs

http://www.antennapartsoutlet.com/Pages/Products/MacoParts.html

the hubs are at the bottom of the page. I don't know if they will fit the size tubing you have, but maybe you can find something from the main http://www.antennapartsoutlet.com page
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KA5N
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Posts: 4380




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« Reply #6 on: November 25, 2012, 09:04:59 AM »


Sounds like you need a time machine.  The Moonraker is an antique.

You might find some hubs off a junked antenna or in a CB'ers
junk box.

Best idea is probably fabing your own.

Allen KA5N

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N8CMQ
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Posts: 355




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« Reply #7 on: November 25, 2012, 04:28:40 PM »

Ok, now I understand.
 
I would use some length of angle 'iron' but in aluminum.
Drill a couple of holes for the pipe clamps/U-bolts and
attach the spreader arms to the angle with worm type
hose clamps. I have used such angle for yagi elements.
 
If the element tubing seems lightweight, you can reinforce
it with another length of tubing slid inside.
 
You could weld the two angles together, but you don't have to.
If you do weld the angles together, use two pipe clamps
for added security.
 
Instead of welding, you could use the aluminum 'solder'
available from Harbor Freight, or other such supplier.
I have used it on my aluminum boat and it holds up well.

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KD0TLI
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Posts: 42




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« Reply #8 on: November 25, 2012, 04:54:28 PM »

The boom on this thing appears to be 4 sections with 3 different tube diameters -- all pretty light gauge I might add.

Some of you suggested making my own hubs (spiders), and I tend to agree after reading of people having trouble with
the hubs spinning on the boom, and overtightening issues too.
With this in mind I'm thinking the best approach is probably going to be to get a one-piece tube of heavier wall tubing,
and then I can make all my spiders (hubs) the same.

I'll keep you posted........Thanks for the advice everyone.
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W9GB
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Posts: 2622




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« Reply #9 on: November 25, 2012, 05:31:34 PM »

The hubs were cast aluminum.  Good photos at the eBay sale referenced.
http://www.ebay.com/itm/HUBS-GAMMA-STUDS-AV-140-AVANTI-MOONRAKER-4-ANTENNAS-PARTS-/181024213241?item=181024213241&lgeo=1&ViewItem=&vectorid=229466&nma=true&si=o1KuCojpSW9%2FcXf5GU54Q0fagz8%3D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

Avanti Moonraker-4 Parts (eBay reseller: komatoast69) http://myworld.ebay.com/komatoast69/
http://moonraker-4.com/

Moonraker-4 Assembly Manual
http://moonraker-4.com/moonraker4.pdf

You just missed an eBay sale of those parts (silent key estate)
eBay Item: 181024213241

Jay, WB8NDE at A-1 Antennas / Cubex may have suitable part.
http://www.cubex.com/index_original_keep.htm

Cubex parts
http://www.cubex.com/hard.htm
« Last Edit: November 25, 2012, 05:48:04 PM by W9GB » Logged
W4OP
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Posts: 421


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« Reply #10 on: November 25, 2012, 08:54:26 PM »

The original hubs were sand cast and  considerably stronger than the  later die cast hubs. The holes in the center of the hubs were a perfect snug fit for the Avanti booms once the ears were tightened down. Your best bet is to wait for another set to become available.

Dale W4OP
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KD0TLI
Member

Posts: 42




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« Reply #11 on: November 28, 2012, 10:51:57 AM »

I've found a couple sources for these hubs, but they want $20 per pair = $80 for the set of (4).

Could I just use a piece of 1" aluminum "angle iron" clamped to the beam to hold the elements ? 
Its not as pretty as the factory hub, but it sure makes alot more sense to me.

Not sure if that will affect antenna performance, but I wouldnt think it would ?
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VE3FMC
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Posts: 987


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« Reply #12 on: November 30, 2012, 05:21:39 AM »

I've found a couple sources for these hubs, but they want $20 per pair = $80 for the set of (4).

Could I just use a piece of 1" aluminum "angle iron" clamped to the beam to hold the elements ? 
Its not as pretty as the factory hub, but it sure makes alot more sense to me.

Not sure if that will affect antenna performance, but I wouldnt think it would ?


The above idea will work just fine. I have seen that method used in photos of quads.

Another method, if the spreader elements are strong enough. Slide a piece of aluminum tubing over top the spreader. Drill it to accept a muffler clamp. Now just clamp the spreader to the boom.
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N8CMQ
Member

Posts: 355




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« Reply #13 on: November 30, 2012, 04:30:56 PM »

Another method, if the spreader elements are strong enough. Slide a piece of aluminum tubing over top the spreader. Drill it to accept a muffler clamp. Now just clamp the spreader to the boom.

If you do this, reinforce the tubing with another tube over it where the holes are drilled.
L or angle will not collect water and split in freezing weather tho.
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N8WWM
Member

Posts: 26




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« Reply #14 on: November 30, 2012, 06:33:33 PM »

I'd just go horizontal only for 10 meters. By the way, the boom aint really long enough to work optimally. Avanti designed the Moonraker for cost and shippability, not for performance.

As for attaching elements, no welding or hubs needed. Using some thick angle stock about 2 feet long or longer if you wish, center mark and drill 2 holes for fitting a U bolt. Take an antenna element and center mark it, matching the center mark of the angle stock. Now, take 2 (or 3 if you wish) good sized hose clamps (STAINLESS STEEL) and clamp the element to the side of the angle stock opposite the U bolt. Been doing it that way for 20 years and never had a problem.

Just took down a long boom (23 foot) 6 meter antenna this fall. After almost 6 yrs not even the suggestion of fatigue in the hose clamps.
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