Any advice from other 6000 owners about interfacing, use, strategy etc.?
I am as excited as can be. I haven't had a beam antenna on HF since 1981, and that was a TA-33Jr.!
Interesting that you bought the antenna BEFORE the tower. A bit "cart-before-the-horse". Let the spending begin! And since you are Indiana, it's a really tough time of the year to plant a tower. But you know that already.
If you are looking at a Crankup / Tiltover type tower for easy maintenance, you might be interested in this resource. Over 350 members and a lot of good reference material.
Have fun with the tower and antenna project.
Regards, Al / NN4ZZ
I just started assembling the T-11 this evening. So far I have gotten all of the aluminum out of the box and sorted it. Wow! There is a lot of aluminum in that package!
I have also separated all of the hardware, nuts, bolts, washers, etc, into a fishing tackle divided plastic box. I have read the directions about six times and planned my assembly strategy.
Tomorrow I start putting it all together.
I hope to get the last sections of the tower up and the antenna mounted within the next week or two!
I hope the weather holds...and my back, too!
Ken - NM9P
Congrats - have had a T8 with a T28 stacked above. Works excellent at my station, been low maintenance and withstood some serious weather without issues.
Even heavy icing has been withstood:
(Article with more icing pictures: https://k9zw.wordpress.com/2010/12/12/hello-winter-ice-snow-at-the-k9zw-qth/ )
Been a very good investment!
My understanding is M2 bought the rights for the Teledyne antennas and offers then in a ruggedized model as well as std models. It is totally impervious to ice now and is virtually flat on 17,15,12, and 10.
The issue with the tower is if I retract it to 23' the rotor will be inside the two outer sections of tower so it isn't clear if good access to the U-bolts is achievable. I believe, if I retract the tower to the point just as the rotor bell starts to drop inside the middle section of tower the height will be about 30'. If someone is going to try to torque the antenna 78 degrees it is likely better to be doing it at 30' rather than 55'. Does anybody know a tower guy in the north east? Don't mean to appear highjacking Ken's thread, so you can respond to me at my call at arrl dot net.
The antenna is great and if the tower would have supported the wind load and weight, I would have tried for T-11 or M2 equiv.
6 of 8 boom sections and 12 of 22 element bases mounted. That is over half the element bases.
Lunch break, now. Then to finish the last boom section with 5 pairs of element bases. Then put the boom sections together and build out the elements.
Glad it isn't too hot in the front yard under the tree!
Have one snag... One of the spacing brackets does not match the holes in the boom. They are off by about 1/16 inch. Need to re-drill the boom tomorrow to be able to mate the halves together. Shouldn't take long tomorrow to do that and finish build out. Then to finish the tower raising and get the T-11 up in the air. That may be next week, bit I wanted to get the antennas built this weekend.
No pictures, it was too dark when I finished.
I got the boom halves mated to one another and the boom to mast plate installed. Everything except the four bolt boom spacer fit perfectly.
I have posted pics of Friday night's work and this afternoon's work. All that is needed is to fix the last boom spacer plate issue, tighten all the spacers, and then build out the elements. The element build-out won't take all that long, they are all standard lengths...Plug & chug! as we used to say in Physics/Calculus classes in college.
Booms ready to invert and assemble.
Aluminum foil plumbing tape sealing the holes in the boom. I hope it doesn't come loose and short the boom sections!
Booms inverted and ready to start attaching the spacers. The double boom serves as a transmission line. The element halves are attached to opposite booms, giving the phase shift for the log periodic feed. No need for cross-crossed feeder wires.
The boom all assembled (except for the one spacer plate issue).
The infamous spacer plate!
You can see the mis-matched holes. No matter how I rotate it or flip it, none of the holes match up. The holes on the two plates are a perfect square and the screws always match each other. But the holes in the boom are half a hole diameter too wide. It is the only spacer with four holes. All the others are singles and had no problem. I am waiting for contact from Tennadyne.
Hopefully I can resolve this and build out the elements on Monday.
Ken - NM9P
On Monday I almost finished the antenna.
Finished built out of elements, except for one 6 ft. tip that would have hit my son's swing set/playhouse. Will put that on after turning the antenna.
Antenna pieces took a little longer because I needed to polish the ends of the elements to remove a little oxidation from sitting around waiting for assembly. BTW..Scotchbrite green pads work wonders!
I coated the ends of all pieces that telescoped into larger pieces with about 3 or 4 inch coating of Penetrox. Covered all the screws, too.
Need to re drill the spacer plates and install them, align spacing and tighten all the spacers, install shorting stub at rear, coax feed/Collins choke, and plug all the element ends. Then I am ready to go up. Unfortunately the weather and my work schedule have not cooperated. I also will be making a trip out of town for a while, so this monstrosity might have to sit on sawhorses for a week or two before it goes up. There is always something!
I have waited this long. A little longer won't kill me!
Sorry for bad pictures. The leather case on my iPad slipped and partially covered the lens.
Ken - NM9P
Got the A148-20t 2 meter antenna finished today.
10 elements vertical, 10 elements horizontal.
This will go on top of the T11 at about 45 ft.
The T-11 will be at about 38 ft.
Thanks to Jerry, KC9ZAR, for building the top plate for the tower and installing the rotor and thrust bearing.
Couldn't get much finished on the T-11 due to weather and work.
Taking the day off tomorrow to see if I can get it finished.
Slow, but making progress. And I am encouraged.
Hope the weather cooperates.
Can't get a very good picture of it inside the garage.
Joining the discussion a bit late as I've been traveling through EU for the last two weeks...
Before mounting the T-11, make absolutely sure you measure the length of each element from the boom to the tip of each element. Regardless of how close it looks, confirm the data with Roger at Tennadyne. Do not assume each element is the correct length just because it looks right.
On my T-14HD, the total element lengths were missing on the supplied documentation. Yes, each element segment length is described in great detail but what's needed is a final validation to a fraction of an inch of each element length. On my T-14HD, some element tubing segments are within a half-inch of each other and can easily be mixed up during construction.
After construction, you can lift one end of the rear shorting bar. Measure DC resistance between the two booms. It's should read open with a DVM or VOM. Reconnect the shorting bar. In our T-14 instructions, the step to install the shorting bar was completely missing.
The T-14HD went together with no re-drilling needed. I was very much impressed with the mating accuracy between segments. There was no slop whatsoever. Noalox was used as an anti-seize compound.
Arguably, the Collins choke should be augmented with a second RF choke at the BMI connection to better isolate common mode current. See W8JI's assessment; he describes this in detail. We have not added the second choke but may try it when the WX cools in the fall.
Finally, when mounted at the top of the tower, try and immediately conduct a sweep of the T-11 with a CIA or VNA device -- especially while the tower and ground crew is still there. Try and avoid simple SWR devices as they do not present the complete story.
The sweep will show periodic changes in SWR, possibly along with some surprises like the attached image below. What's shown is a complex Z and SWR sweep of my T-14HD from 30m through 10m. The shaded gray bars show the amateur bands. Note the extremely sharp SWR spike just above 17m. I have several theories based on input from Roger, W8IO and L.B. Cebik's material. W8IO is a commercial LPDA designer. In actual practice, it's not a concern and is not affecting gain nor F/B performance.
Finally got everything done on the T-11.
Spacer plates drilled out and installed.
All boom spacers realigned and tightened.
boom to mast plate reinstalled and tightened.
Element ends and stubs plugged or taped.
Collins choke/feed line installed.
Rear shorting stub installed.
Had to run to Fastenall to get another bolt because I twisted one off on the spacer install.
Only broke two small bolts, and lost two nuts and one 1/4 inch socket in the grass. Not too bad for this complex assembly!
Rain threatened all day. Looks like it will finally get here.
Ken - NM9P
But here were several stations in Oman and U.A.E. that were Q5 copy that were unreadable on the other antennas!
This is going to be fun....
Thank you everyone for your encouragement and support!
Ken - NM9P