| Author |
Message |
    
yapper
| | Posted on Thursday, October 31, 2002 - 9:43 am: | 
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I just was given a 500ft roll of 14gage stranded plastic coated wire. What can i do with this stuff? Radio use i guess is what i am asking. |
bruce
| | Posted on Thursday, October 31, 2002 - 3:13 pm: |
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A 1750 meter antenna ??? |
ryan
| | Posted on Thursday, October 31, 2002 - 7:23 pm: |
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if you have the space, wire up a 40 element wire yagi pointing to the far off place of your choice. |
yapper
| | Posted on Thursday, October 31, 2002 - 8:19 pm: |
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Yup some good ideas! Just wondering if it would be poss to make a a curtain array??? |
Taz
| | Posted on Friday, November 01, 2002 - 5:04 pm: |
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sure, you could do that too. |
de
| | Posted on Sunday, November 03, 2002 - 9:55 am: |
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Re Curtain Array aka Bobtail Curtain...
Should yap decide to build a Bobtail Curtain here is how ya do it. The source is the ARRL Antenna Book.
This is an antenna that is three vertical sections that are placed in line with a phasing line attached to each and fed with coax thru a inductor and variable cap in a parallel circut.
It is not a simple antenna. But here goes.
Cut three quarterwave lengths of wire usning the formula 234 divided by Freq in MHz. Errect the three vertical wires in a strate line and space them 492 divided the same freq in MHz used above. Cut two lengths of wire using the 492 method above. Using these two pieces of wire connect the tops of the antennas using this phasing line.
Now for the hard part. Construct a tapped coil (L) and a varable cap tuner (C)in a parallel configuiration. Connect the bottom of the center vertical to one of the L/C junctions and ground the othr LC junction. A good ground field helps.
To hook up the coax to the antenna you tap the coil using the center conductor and ground the shield. Adjusting for best SWR is a simple matter of moving the tap on the inductor (coil) while you adjust the varable cap. The book suggests that you start to tune with the varable cap set to max value.
If there are no objects to skew the signal pattern, the signal will be broadside and bidirectinal. The dB gain per the book should be 5.8 dB.
Have fun. |
DeadlEyes
| | Posted on Sunday, November 03, 2002 - 10:01 am: |
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Re bruce...
He could also make a 160 M one wave length loop antenna.
A very nice antenna.
DE |
bruce
| | Posted on Sunday, November 03, 2002 - 6:49 pm: |
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I wisk i had land to do that it would be nice and about the size of SEMINOLE! |
Taz
| | Posted on Sunday, November 03, 2002 - 9:08 pm: |
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hahaha |
yapper
| | Posted on Sunday, November 03, 2002 - 9:33 pm: |
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Working on a large antenna!! i hope to have a pic of it soon. i got it up (well Almost) today and hope to have it up and running tomorrow. Will let you all know soon!! |
de
| | Posted on Monday, November 04, 2002 - 6:39 pm: |
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RE Bruce...
In theory you could put up a 160 meter lazy loop antenna on a 75 x 100 foot lot if you had a tree on all 4 corners of the lot and you pinched in the middle of each side to take up the excess wire. Of course it would be very lazy aka loose but it could be done. I once put up an 80 meter lazy loop on 2/3 of my 75 x 100 lot with no trouble other than branches in the way. Well now I do not have to worry about branches. The hurricane erased almost all of them and the remainder shall fall victim to my chain saw ha ha ha.
Later
DE |
yapper
| | Posted on Monday, November 04, 2002 - 7:21 pm: |
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Maybehtt ill do this!!http://www.haarp.alaska.edu/
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yapper
| | Posted on Monday, November 04, 2002 - 7:23 pm: |
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http://www.haarp.alaska.edu/ Messed up the other post LOL |
