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Well here we go again. I will not quit until I get this right. Needing a good base line I decided to assemble the original Astroplane and take good baseline readings from that. I assembled the antenna following the instructions exactly. The coax used is a half wavelength LMR 400 VF=.85 as...

Thank youu for the reply. The volicity factor was not considered in the length of trhe 1/2 wave coax, thanks for straightening this out. The " were typos I indeed mean Feet. Strange that I should do that, I had a thought that I might be human! --- Darn.:)

I agree that I need a good base point to start with, that is why I am starting with different and better coax. I would disregard the first set of test numbers as the coax was not 1/2 wave length. Now that I have a base point I will do the mod without changing anything other than the top radial...

Ran into some complications with my coax. Made a new 1/2 wave length of LM 400 then set the element lengths to what the original Astroplane were. See the doc attachement. I hope to try the modification tomorrow and post results of the straight element w/o top hat.

Getting ready to see if your results will be dupicated when I ditch the top hat. Will be trying it tomorrow.

There can be issues with feel lines sometimes that affect the meters results, but the factors above are good goals. It is always best to take these readings for tuning purposes at the feed point and at the working height---albeit inconvenient. I kind of figured that, the meter instructions say...

I don,t really like to post these kinds of photos but a couple shoudn't hurt. You never know. Not much just some old clunker machines. They can make the parts though Photo 2

This would all make sense as skip tends to scramble polarity. Also you had mentioned that you took the top hat off of your AP and put a straight radial on top. The patent states that the upper radial should equal the length of the lower flaired radial. I wonder why you were around the 70 to 80...

The instructions mention at least 3 feet of mast below the round loop at the bottom of the antenna before any other suport stucture when considering a mast pole. You said yours will be choked at 9' below. Do you mean a choke in the feed line/coax?

What do you think would happen if you were to take a Stock Starduster which is basically a 1/4 wave groundplane and double the length of all elements. Would you now have a 1/2 wave Starduster? It don't take much to be more in the know about antenna than myself so please tolerate weird...

Will you be using an analyzer when you build your beam? I sure would be interested to know what kind of numbers you are seeing at resonance and at the ends of your <1.5:1 and your <2:1 bandwidths. You will figure it out when you get your APB up and working I'm sure, so keep us posted on your...

Thats the same stuff I use also.

Here you go.

Thanks and yes they are non matalic, Don't know if wet changes anything yet.

Thanks I needed that

I would probaply give you $100 + shipping for it but things like that would probably go for more on Ebay if your into that.

Are you sure on that idea of paralleling two 75 ohm coaxes? I don't think we are talking pure DC resistance here. I may be wrong though.

One of the improvements on my copy is the ability to adjust the length of the down legs that go to the loop on the bottom. I use two different sizes of tube here so one slides into the other at the cross support. I am also using collars instead of hose clamps at the joints. I think one of these...

This is a photo of the mast attachment. Its kind of hard to get a good one now that the antenna is up but will work on it latter today and see if I can get some better ones. Reply to Marconi; Starduster, if I said I was concerned about the SWR you saw, then I misspoke. No misunderstanding...

That sounds like a plan.