Build an Astroplane in one evening

For discussions dealing with CB Antenna Systems.
Post Reply
HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Build an Astroplane in one evening

Post by HomerBB » Friday 3rd Jun 2011, 16:56

I put this together in about 4 hours because I wanted to see what results could be had from such a thing. First time up the SWR on 40 is 1.4:1 and on ch1 it is 1.9:1. Talked and receives just fine. More later. Gotta go back to work.

Image

All the weird curves is my camera doing strange things again? ? ? :cyclopsani:




Materials for Quick AP:

Image Image

The bottom ring assembly:

Image Image

Coming together:

Image Image

More tomorrow.

Spec sheet with measurements available on request. Too big to post, if reduced unreadable.

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Saturday 4th Jun 2011, 9:49

Worked on it little more. I had the top bracket too wide, so I replaced it with sturdier aluminum stock (second u-clamp wasn't on it yet in the photo), and adjusted the width a little more at the mid bracket. SWR is closer now - on ch40 1.2:1 and on ch1 1.4:1.

Getting there. I probably won't make this a keeper, just a for funner. I'll likely let it go to a friend for cost of parts. Just a little more . . .

Image Image

Image

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Saturday 4th Jun 2011, 11:45

A little more tinkering done. SWR 1.1:1 at 40 and 1.

Some contacts a few minutes ago with bottom ring mounted 20' in the air.

3030 --------------------------------- 26.695 AM NC
7440 --------------------------------- 27.385 LSB
WR077 ------------------------------ 27.385 LSB GA
206 ---------------------------------- 27.385 LSB TN
619 ---------------------------------- 27.385 LSB KY
662 ---------------------------------- 27.385 LSB Lake Erie
Rusty Nail ------------------------- 27.125 AM

Others I didn't write down.

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Saturday 4th Jun 2011, 14:51

One of my purposes in making this AP was to show that an antenna can be done on a very tight budget that performs admirably well. Everything on this antenna was purchased at Home Depot. Some things, like the roll of tape, and the aluminum flat stock, cost more than the figures to purchase, but the cost is prorated to reflect the amount of each that went into the project. While i might would replace the tubing with aluminum tubing if I wanted maximum durability over the long haul, that in no way means that this homebrew AP is taking a backseat to any other antenna performance-wise for those who need a budget product.

cost of materials:

top hat rods ----------------- 4.00
aluminum plate ------------ 3.50
u-bolts ------------------------ 5.00
screws ----------------------- 0.75
PEX tube --------------------- 2.50
CPVC tubes ----------------- 4.65
CPVC tees ------------------- 2.00
Aluminum tape ------------- 2.00
3/8"x4' fb rod ----------------- 1.00
________________________
total ---------------------------- 25.40

The center mast pipe is what ever mast you use. I already had it and the fellow who gets this antenna will get his own or pay me to replace the pipe i have.

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Sunday 5th Jun 2011, 5:13

Set up outside under my umbrella (too #&*#$^@%$ hot otherwise) I put the MFJ209 and the frequency counter in line and this is what it says.

2.0:1 ------------------------ 29.695
1.0:1 ------------------------ 27.875
1.1:1 ------------------------ 27.405
1.2:1 ------------------------ 27.205
1.5:1 ------------------------ 26.695
2.0:1 ------------------------ 26.415

The setup testing:

Image

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Tuesday 7th Jun 2011, 16:14

Readjusted some things, tightened up some joints, recalibrated measurements, changed out the center spreader for plexiglass plate, and beefed up the clamp on the longest leg to the top plate. I think it has a little more symmetry.

Image

Image

Image

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Saturday 11th Jun 2011, 4:30

Got it above the Yagi for a workout.

To the tip-top it is 57'
To the coax connection it is 53'
To the bottom ring it is 45.5'

Image

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Thursday 8th Sep 2011, 3:46

I have the Homebrew Astroplane back up temporarily as I do repairs and upgrades to the tip-over tower. The SWR is still great, and it works a charm.

Image

Image

kulaguy
Newbie
Newbie
Posts: 2
Joined: Sunday 11th Sep 2011, 17:46
First Name: ron
Location: hawaii

Re: Build an Astroplane in one evening

Post by kulaguy » Sunday 11th Sep 2011, 18:08

aloha from HAWAII. joined this site just cuz of ant, build. shipping is almost same as cost of ant. from mainland. got lowes and home depot here. sure parts cost more but still better deal. would really like to have blueprints to build one. 73's and a big mahalo (thanks). kula guy

HomerBB
Frequent Keyer
Frequent Keyer
Posts: 69
Joined: Friday 8th Apr 2011, 1:45
First Name: Charles
Location: NW Arkansas
Contact:

Re: Build an Astroplane in one evening

Post by HomerBB » Monday 12th Sep 2011, 1:33

Welcome to the site, kulaguy, and thanks for your interest in the antenna.
Building and using homebrew antennas is the best part of the radio hobby for me. I do it for the pleasure I get from it, but sometimes I also save money. There are several antennas I have built and are now flying over someone's shack in my area simply because I was done with them and they needed to get on the air.

In the photos below you'll notice dimensions are metric. Some of the more critical dimensions I've converted to US Imperial decimal measurements, such as 320 metric to 12.6 (or 12 5/8") Imperial. There is a metric converter at this location for those I didn't convert:

http://www.worldwidemetric.com/measurements.html

Have fun, and ask any questions you have. I'll try to answer them.

Image

Image

Post Reply

Return to “CB Antenna Systems”