I just noticed that I’ve never posted a picture of the completed tower. Here it is.

The tower is now mostly done.

The HF antenna is up, as are the 2m and 70cm yagis.  The rotor is installed, and rotates.  Mostly. There's a tree in the way of the HF beam, so it can't rotate.  I have a guy with a boom truck coming to fix that little issue. I still have coax runs down the tower to make.  And install some 3" conduit for the coax entry.  And the lightning protection box.  And build a rotor protector.  Polyphaser wants entirely too much money for theirs.

I had planned to run the conduit today, and mount the box for the lightning protectors., but I got called to go to work instead.  Since work pays the bills, and it should be overtime, I'm not complaining.  I could use some overtime.

I came up with a simple system for grounding the antenna coax at the bottom of the tower.  I'll be working on that a bit more to get it perfected, then I'll post some info and pictures when I actually get to that stage on the tower.

I'm way behind on updating here.. The tower itself is up.

I home brewed my ginpole using an actual gin pole head I bought on ebay.  I added a 10 foot section of 1" galvanized pipe.  I didn't buy any brackets, so I used u-bolts to attach it to the tower.  Not recommended.  And I would much prefer about 12' of 6061-T6 aluminum pipe to the galvanized.

I still don't have my house bracket built.  I'm hoping the tower is a bit sturdier once I do. I'm waiting on parts from Cushcraft for the A3S, it sounds like they should be shipping early next week.  My mast pipe has arrived.  I wanted a seven foot pipe, and the 1 5/8" galvanized pipe I had is very heavy and would be a real pain to get up the tower.  I opted for a seven foot piece of Schedule 80 6061-T6 extruded pipe.  I found a very reasonable price for it, around $40, and was able to get a couple pieces of brass from the same supplier.  More on those in a future post.

So at this point I'm ready to install the rotor and mast, and the 2m beam.  The grounding is substantially complete, or as complete as it will get at this time considering that I'm way over my allotted budget for this project.  I think it will be "good enough", although it is certainly not ideal, but considering the rock it's hard to get an ideal grounding system installed.  I found some major issues with my current grounding that were fixed.  I'll post more about the grounding in the future. Hopefully I'll get that house bracket built this weekend.

Just a few more updates.

The Cedar Rapids Hamfest is Sunday.  I will be on the lookout for a nice 2m Yagi to use on SSB. Tomorrow I will be working on tower grounding.

Some photos this time around.

To build a tower you have to dig a hole.  A pretty good sized one.  In my case a minimum of 30" square and 48 inches deep.  No problem.  In normal soil.

I don't live on "normal soil".  Our neighborhood is notorious for limestone.  Even the electric utility had issues bringing in power due to all the rock in the ground.  There's rumors that basements were dug with the help of dynamite.  I don't know about that, but what I do know is that I ran into my fair share of limestone.  It starts about 6" below the topsoil.  And it stops, well, I don't know where it stops.  I can't dig that far.  But I'm guessing it goes down a long ways since there is a quarry about 1/4 mile east of us.

Needless to say it took me awhile to dig that hole.  And in the end I rented a jack hammer to help me get through all that rock.

Just a few of the rocks I dug out.

I ended up making it to 48".  I originally wanted to go 60" pretty badly, but after all that rock I'd had enough.  That and finding a place to get rid of all that rock.

The Rohn tower book says that the concrete base should be 6" above grade.  Or maybe it says 4" above grade.  I don't really remember.  Many hams leave the concrete several inches below grade, their thought process being that when they take the tower down they can just dump some soil there and plant grass.  Good in theory.  My concern was water, more specifically, rust.  I don't like rusty towers.  By keeping the base above grade I'm hoping to avoid any rust on the base of the tower.

So here's the hole, and a 2×6 form to square it up.

We added a welded rebar cage, and the J-bolts for the base plate.  And of course, the concrete.

Robert (I didn't catch his call), Jay (KC0AKJ), and Cliffy (KC0RFN) mixed concrete.

I had the easy job, driving the concrete buggy!  Best $75 ever spent.  Pushing wheelbarrows of concrete uphill would not have been fun.

And here we are, 3500 pounds of concrete mix later.

I'm a bit slow at getting the pictures posted, it's been nearly two weeks since these were taken, so I'm a little bit further along than this.  More to come.

Here is the latest on the new tower. So far I have acquired:

• 40' of Rohn 25 tower
• The concrete base plate
• A Rohn heavy duty house bracket (which needed some modifications)
• galvanized concrete anchor bolts
• new Rohn hot-dipped galvanized leg bolts

And so the digging of the foundation has begun.  And it's been an uphill battle due to the property being situated on top of solid limestone.

The foundation will be approx 30 inches square, and four to five feet deep, depending on how hard it is to dig the rock once I hit the 4 foot level. You can see behind me next to the house some of the big chunks of rock that I've broken up and pulled out of the hole.  Good times.  Most of the rock is breaking into baseball sized pieces. There was about six inches of top soil over the rock.  This may explain why my lawn dries out so quickly in the summer.

This past weekend I visited KA0ZOZ and acquired a used Cushcraft A3 tri-band beam, a Yaesu G-800SA rotor with 60+ feet of rotor cable, and a Kenwood TS-711A 2m all-mode radio.  This has me even more fired up to get the hole dug!  I still need to find a 2m yagi to use for SSB, and a bunch of coax.  I'm thinking the Cedar Rapids Hamfest next month will be a good place to look.

I have a feeling the worst may be yet to come.  I need to find a way to drive a few more ground rods, and trench in some wire between them and the single point ground bus bar at the coax entrance.  I also plan to utilize a 'ufer' ground by having the rebar welded into a cage and bonding it to the tower legs.

I now have three 10 foot sections of Rohn 25G tower sitting in my yard. I hope to get started soon getting that thing up in the air.

I still need a 36″ house bracket. Rohn gets $249.00 plus freight for their heavy duty “universal” model which supports both Rohn 25 and 45 (more on that to come). I think I’ll check to see if the local welding shop can make me one. Of course Rohn leaves most of the dimension out of their engineering drawings, but maybe they can figure it out.