7' Skipshooter (Pictures and measurements)

[2NC995]

Below are some measurements and photos I took for Marconi. He is working on a model for this antenna.

Figured I would share with all:



BASE:



MID SECTION:



UPPER SECTION:



TIP:

 

[Slowmover]

Nicely done.

 

[Marconi]

Very good work Dan, thanks!

 

[Alan Blackmon]

Very clean work.

 

[walterjn]

Hmmm, might have to try my hand...

 

[Marconi]

2NC995, in your images #2 & #3 above, can you give me the space dimension for the top coil area that is 12" inches long and the same for the coil that is 68" inch long?

If you can measure the space dimension between coils as close to center to center for the wire as you can. Modeling measures spacing between parallel wires from center to center, not edge to edge.

Your post #1 above shows 0.0415" inches for the wire diameter, so could you check this again for me? The wire diameter itself is...measured from edge to edge.

I don't mean to be so picky, but the link below clearly shows the wire for the 7' Sharpshooter is #17 gauge wire. Sharpshooter, among other CB companies, is a division of Charles Electronics. (http://macoantennas.net/).

Also see the link below for the Sharpshooter site.
http://skipshooterantennas.com/Antennas/S7.html

 

[2NC995]

I don't mean to be so picky...

No worries...be as picky as needed!

I’m still at the beach DXing, or trying anyway, will update in the AM.

Thanks for looking so hard at this.

 

[Marconi]

Here is the model that is close to the dimensions as I understand them. The model is a little less than 2" inches to long, but the match shows the antenna is short, R = 42.44, X = -20.44 ohms = 1.598 SWR.

This suggests the antenna a couple of inches to long, but the match shows the antenna is short. I have one more adjustment I want to change at the bottom where the solider wire section and the 3 coils are located.

I also want to try making the 4 radials a bit longer and see how that effects the match and the overall total length of the radiator. I took the 4 wire ground plane off of a 1/4 wave whip model that worked and matched well. The model is already near my maximum segment limit...so I can't play with the ground plane much. This model has over 300 wires with all the coils it has.

 

[2NC995]

Ok, Marconi:

For the wire diameter: ~0.041" is what I am measuring. Definitely not 0.450+" one would expect to see with 17 gauge. I would imagine this is actually 18 gauge with the small increase in diameter coming from the enamel.

For the top section: ~0.185" turn to turn, measured CENTER TO CENTER.

And for the bottom section measured the same way: ~1.595”

 

[2NC995]

Sorry, an error in the last paragraph. For some reason I wrote 0.1595”, which makes no sense.

Corrected.

 

[Marconi]

Ok, Marconi:

For the wire diameter: ~0.041" is what I am measuring. Definitely not 0.450+" one would expect to see with 17 gauge. I would imagine this is actually 18 gauge with the small increase in diameter coming from the enamel.

For the top section: ~0.185" turn to turn, measured CENTER TO CENTER.

And for the bottom section measured the same way: ~1.595”

Thanks Dan. my current space between coils for the bottom is 1.563".

BTW I allowed for 0.053" as the thickness for the wire coating.

My top wire spacing is set at 0.201" and I will reduce the thickness for the wire coating and maybe that will allow me to get the coils closer together. This may be the difference and give me a better match without getting and error for wires that are to short or too close together.

Thanks for your patience and your help.

 

[hotrod]

thank,s guys for the work in this.. ive used topload antennas in the past,, they seem to work well.. not much on power handling or bandwith. i may have to give this one a try

 

[2NC995]

.. not much on power handling or bandwith.

I'm running a DX500 into it with no ill effects to date. Only SSB, however, which is probably a little easier on it.

 

[hotrod]

so question to all that use the skipshooter anyone ever put a spring under it.. i ask cause with everything on these days you gotta use drive thrus.. ...so i thought with the spring it would give and bend back outta way till i cleared.

 

[walterjn]

thank,s guys for the work in this.. ive used topload antennas in the past,, they seem to work well.. not much on power handling or bandwith. i may have to give this one a try

According the their site, they claim that the 7' skip shooter is supposed to be able to handle 5k.
http://skipshooterantennas.com/Antennas/S7.html
The S7 SkipShooter® antenna is 84” long and has a proven high-performance design
that will withstand 5000 watts.