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Author Topic: Need Help Identifying Antenna...  (Read 1393 times)
KG6QVH
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Posts: 12




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« on: August 04, 2007, 04:39:39 PM »

Hi,
I am trying to identify a 3 element beam antenna,the only thing I have to go by is that I have been told it could possibly be an older Mosley,but I have not found any Mosley antennas  that match.

There are 6 traps total(one on each element)each of which measures 12 inches long by 2 inches in diameter.
The Boom is 14 feet in length and 2 inches in diameter. There is a Black cap at one end and a red cap on the other.
Each element where it connects to the Boom is approximately 1 1/4 inches in diameter. I am unsure of how long each element is.
The coax is connected to the driven element by the means of a bolt style clamp.

I have posted three links one showing what the traps look like and the other showing how all the elements are connected to the boom. The last one shows how the driven element is insulated from the Boom and how the coax is connected.

http://img72.imageshack.us/img72/3692/trapup1.jpg

http://img245.imageshack.us/img245/1378/elements2vh0.jpg

http://img162.imageshack.us/img162/9043/element3wy2.jpg

I have also posted this on QRZ in hopes of  somebody there being able to recognize the antenna as well.
Any help in identifying this antenna would be greatly Appreciated
Thank You
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VK2GWK
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Posts: 196


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« Reply #1 on: August 04, 2007, 05:45:43 PM »

Do you want to know what model it is or do you want to put the antenna together again....Huh Personally I would not care about the name or the model that much. Whats in a name... Smiley Does it work properly, that as far more important

If it is a three element trapped yagi then I would do the following:
* sort the elements in pairs with equal length;
* the shortest will be the director elements
* the insulated ones the driven ones,

Usually the director and driven element are closest together and the reflector is the one further away from the driven element.

Just put it together and try it out....
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KS2G
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Posts: 428




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« Reply #2 on: August 04, 2007, 07:45:44 PM »

Hi Les,

What you have is not a Mosley, it's a Hy-gain.

The element-to-boom clamp shown in your photo (http://img245.imageshack.us/img245/1378/elements2vh0.jpg) is unique to Hy-gain. Mosley uses u-bolts and flat plates.

Likewise, the "slim" trap in your photo (http://img72.imageshack.us/img72/3692/trapup1.jpg) is the size that Hy-gain uses. Mosley traps are much larger diamater. Also, the aluminum compression clamp shown in that photo near one end of the trap is what Hy-gain used for many years, until switching to "worm-gear" hose-clamps.

However, based on your description, I don't think you have all of the parts.

Yes, the coax attaches to the bolts shown in your photo (http://img162.imageshack.us/img162/9043/element3wy2.jpg) but they also serve to anchor some small-diamater tubing (or solid aluminum rods) and clamps that make up a beta match.

In addition, you say you have only six traps, two per element. Mosley antennas use two traps per element (actually, their "fat" design is because they're really  two traps inside a single enclosure). But Hy-gain antennas use separate traps for each band (15M and 10M) so there should be twelve of them, four for each element.

Based on the 14-foot boom, I'd say you have (at least part of) an early TH3 series tribander (known years ago as the Thunderbird). There have been four versions, most recently the TH3-MK4. They're all basically the same: 14-foot boom, 27-foot longest element, 15-foot turning radius, 5.8dBd forward gain, 25 dB front-to-back ratio, full legal-limit power capacity, 4.6 square-foot wind surface area, 95 mph wind-survival rating.

Hy-gain (now owned by MFJ) still makes them. You can download the Assembly/Instruction Manual from their web site:
http://www.hy-gain.com/products.php?prodid=TH-3MK4

You can also order parts to fill-in what you're missing, replace the worn-out plastic pieces, and substitute stainless steel hardware and clamps for the rusted-out stuff you have.

It could be a worthwhile restoration project. The current list price for that antenna is $470 and very few retailers discount it.

It's a terrific antenna. I had a TH3-MK3 up for 25 years and never had to touch it through high-winds and ice storms until one of the traps finally failed (due to mechanical stress). I replaced it with a TH3-MK4. Up only 35-feet on a roof-mount and running no more than 100 watts, I've worked 225 DXCC countries and snared several Top Ten contest certificates on 10 and 15 meters.

Good luck!

73,
Mel - KS2G
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KE3WD
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Posts: 5689




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« Reply #3 on: August 04, 2007, 07:55:09 PM »

You've got a Mosley.  

Possibly a darn good clone but I doubt that.  

See the "M" stamped on the one crossconnector?  

Can't tell you which one but the length of the elements will.  

You should indeed measure all element lengths and write that down.  

The element lengths can identify the model.  

Likely TA 33 or possibly 33 JR series if the elements are short.  From memory, which is hazy, of course.  

http://www.mosley-electronics.com

If you contact them, they are great folks who support their stuff no matter how old or which owner down the line.  

One of their bylines is, "Mosley's are handed down from one generation to the next."  

World's most copied trap multiband yagi antenna is another.  

Parts, upgrade kits to WARC bands, manuals and support should still be available.  


.
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KE3WD
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Posts: 5689




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« Reply #4 on: August 04, 2007, 08:03:26 PM »

Now I'm confused because I've had both Mosley and HyGains in the past.  

HyGain assbly manual online with picts:

http://img245.imageshack.us/img245/1378/elements2vh0.jpg

Mosley assy manual:

http://wb0nni.dakotamade.com/cl33.html

It indeed is a HyGain, sorry for the confusion.  


.
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KC8VWM
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Posts: 3121




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« Reply #5 on: August 04, 2007, 09:58:50 PM »

Hygain used a plastic supplier called "Niagra Plastics" to make the plastic caps to fit over the ends of the antenna traps.

Look at them closely and observe if this supplier name is stamped on them.

Hope that helps.

73 de Charles - KC8VWM
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K0BG
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« Reply #6 on: August 05, 2007, 05:31:47 AM »

It's a HyGain TH3, albeit an older model. HyGain switched over to the cone type end caps about circa 1970. The only thing missing (at least in the photos) is the BN86.

Alan, KØBG
www.k0bg.com
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K9YLI
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Posts: 872




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« Reply #7 on: August 05, 2007, 08:18:55 AM »

the middle picture with the number 6 stamped in it looks like  one i have,albeit it incomplete.
I think that makes it a wilson..
they got parts from other manufacturers.
every thing else ,insulators on the driven elements, and the slight taper on the trap caps, says Hygain.alos thats a hygain type element to boom  clamp.
Much like my  th6 which i just re capped.
I can take picture of the feed section on mine,
I am missing the trap and end piece of one director on mine.

K9yli@aol.com email me ..
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KG6QVH
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Posts: 12




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« Reply #8 on: August 05, 2007, 03:12:53 PM »

Hi VK2GWK,
I do plan on putting the antenna together again once I get it cleaned up but I would also like to know what model it is so I know what I am working with.

Hi Mel,
I checked out the TH3 series of antennas and while they are very similar I couldn't find any that matched 100%. I couldn't find any indication on the boom that there ever was a Beta match. I'm not opposing what your saying.The antenna has only had but 2 owners so it seems odd that many parts would be missing?

Hi KE3WD,
The M that you see stamped on the Element to boom clamp is in fact a 6...I checked out the TA 33 series and the driver to boom mount is completely different from what I have.

Hi Charles,
I checked out the end caps on the boom and the traps for the suppliers name but unfortunately  it is not on them.

Hi Alan,
You also say its a TH3 and that the only thing missing is the Balun...All the TH3 I looked up had 12 traps(two per element)where as mine only has 6?

Hi K9YLI,
I searched for Wilson antennas to compare but couldn't find much on them...


Thank You all for your time and help it is very much Appreciated
Les
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KG6QVH
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Posts: 12




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« Reply #9 on: August 06, 2007, 12:55:37 AM »

Hi,
I believe I may have stumbled upon what the antenna may be...As I was looking through an old issue(1979) of 73 Magazine I came across an ad for a Wilson System 33(Formerly System Three)the picture sure looks like what I have but as all pictures of antennas are(I wonder why that is?)its not clear enough to be 100 % positive.
Looking at the specs it looks like a good match with a 14.4 foot 2 inch diameter boom 3 elements and 6 traps and the element to boom clamps look dead on.

I have done an exhaustive search for a manual so as I can get some better details and measurements but came up empty handed.
I was wondering if anybody could possibly point me someplace that I can download the manual or could possibly share a scan of?

Thanks for the help everyone
Les
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K9YLI
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Posts: 872




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« Reply #10 on: August 06, 2007, 07:16:40 AM »

I did a lot of research on wilson as i am missing  one trap and the end element.  element i can make.
I can make a trap too by copying the one i have .
Wilson quit making Ham antennas long ago.
The only thing i learned is they used parts from other MFGers and just assembled them.
Also  a ham in the club has a wilson  and verified mine is a wilson.
Checked my  TH^  traps to seeif  I could modify and substitute.
Price went sky high since new and I think I can by some styrene and  wrap my own cheaper.
Mine is complete ,other than the element so I can photo the feed  mechanism.
(be gone to texas for 2 weeks)..
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W3ML
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Posts: 166




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« Reply #11 on: August 06, 2007, 07:21:42 AM »

You can purchase a manual for Wilson's antenna at

 http://www.manualmall.com/TE_ZC.html

Cost is $8:00

73
John
W3ML
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KE3WD
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Posts: 5689




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« Reply #12 on: August 06, 2007, 09:01:43 AM »

Don't overlook advertising in WANTED sections of websites like QRZ, etc.  

Some ham may have one or two sticks with traps hanging around and you can make a deal.  


.
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KA5N
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Posts: 4380




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« Reply #13 on: August 06, 2007, 09:02:43 AM »

You can download a manual for the system 36 (33's big brother) at
http://bama.edebris.com/manual/wilson/sy36
Not a great copy but you see the same element to boom mounts and there are a total of 6 traps (on the elements with traps).  The 36 is twice the size with a 24 foot boom and more elements.  It does show the beta match which is made of small diameter tubing which could easily be lost with time.
Good luck
Allen
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KG6QVH
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Posts: 12




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« Reply #14 on: August 06, 2007, 01:57:56 PM »

Thanks guys,
I fellow over on the other board is going to send me scans of the manual.

K9YLI,
If you could send a photo of the feed that would be great,sometimes the manuals lack detail in there photos. My email is good on QRZ.
I'm almost 100% sure this antenna I have is a Wilson 33,my fingers are crossed
Good luck with your antenna. And have fun on your trip

Thanks for all the help Everyone
Les
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