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3 EASY ANTENNAS FOR BEGINNERS

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  • RIN67630
    replied
    I just built a J Antenna, from a piece of 2,5mm˛ cooper wire.
    It was very easy to build. It is now taped on the window and works much better than the T, that I have built before.
    The nice thing with that antenna, is that it shortcuts all low frequencies very well.
    That is important since the reciever is broad-banded.

    Leave a comment:


  • abcd567
    replied
    @jrf:
    Nice to see your innovation. You are the first one I know who has used a F barrel connector (F female - F female) with a rectangular plate, instead of SO239 or N connector.

    Using a 52mm copper wire soldered to a nut with the whip antenna is also very innovative.

    The other alternative was to cut the original whip to 52mm, as shown in my post #8 in the thread "Optimize the Whip Antenna Which Is Supplied With DVB-T Dongle". CLICK HERE

    .
    Last edited by abcd567; 2016-03-18, 20:38.

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  • jrf
    replied
    I made my first spider and will put it to the roof asap. Actually I am using a modified DVB antenna in the attic under the insulated roof: removed the whip, soldered a copper to a nut and attached to the antenna foot so that I have the recommended 52 mm, respecting the "antenna" inside the foot.
    Next:
    2016-03-18_0929.jpg
    Old (you can see the pole on the right side that is going through the roof for SAT antenna where my spider will also be attached to):
    P1040690.jpg

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  • andrewh_85
    replied
    Cheers abcd567 will give it another go and see how I get on.

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  • abcd567
    replied
    @andrewh_85:
    1) Few mm more or less in tin height is not critical.
    2) Reducing height of whip by 2 to 3 mm i.e making whip height 66 or 67 mm instead of 69 mm gives some noticeable improvement. This is due to the phenomenon called "end effect" which causes this.

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  • andrewh_85
    replied
    This has been a great read always veered off making antennas as I'm new to this stuff.

    Made my first cantenna last night think I need to do it again as the tin is just shy of 69mm.
    Last edited by andrewh_85; 2016-03-16, 13:19.

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  • abcd567
    replied
    Originally posted by dudesjp View Post
    @abcd567, yes! I think that 1 or 2 meters higher will help and is not hard to do! Let's see! Besides, today arrived from China (AliExpress) a antenna that i bought by 3US$! I'll let VR do the range plot and see if its better than the original one that come with the dvb-t! I'll test in the other Radar, the T-SBCT6 that are inside my house!

    This is the antenna!
    [ATTACH=CONFIG]7160[/ATTACH]
    I also purchased similar antenna for $5 (price+shipping) from eBay last month. Not so good as advertised.
    The the original one that come with the dvb-t, when cut to 52 mm, proved better, Click here: Post #8, Optimize the Whip Antenna Which Is Supplied With DVB-T Dongle


    Also see this one:
    Click here: My post in Flightaware Forum

    Leave a comment:


  • abcd567
    replied
    SOME MORE EXAMPLES OF OUTDOOR INSTALLATION OF CANTENNA




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  • dudesjp
    replied
    @abcd567, yes! I think that 1 or 2 meters higher will help and is not hard to do! Let's see! Besides, today arrived from China (AliExpress) a antenna that i bought by 3US$! I'll let VR do the range plot and see if its better than the original one that come with the dvb-t! I'll test in the other Radar, the T-SBCT6 that are inside my house!

    This is the antenna!
    IMG_3555.jpg

    Leave a comment:


  • abcd567
    replied
    Some Examples of Outdoor Installation of Cantenna

    .

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  • abcd567
    replied
    A Cantenna made of iron food can, instead of aluminum drink can. Mechanically stronger and better suits outdoor instalattion without any casing.

    Note the Silicone sealant/adhesive at the F connector where whip wire enters it.
    The sealant/adhesive helps in keeping moisture out of electrical components, and also prevents the whip from getting blown away by strong winds.

    The finished cantenna may be spray painted to prevent rusting.
    .
    Last edited by abcd567; 2016-03-11, 06:16.

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  • abcd567
    replied
    Cantenna up & high. No enclosure.
    By forum member "trigger".

    Click here: Post #1465, page 147 of thread "best antenna"



    Last edited by abcd567; 2016-03-10, 22:45.

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  • abcd567
    replied
    @dudesjp:
    To get a 100% no-obstruction, you may need substantial height. However raising by using one or two meter long pipe or wooden stick will not be difficult, and will bring substantial improvement in range. Raise it as much as you can conviniently do, and dont worry about length of coaxial cable, 4 or 5 meters extra wont make any difference.
    Last edited by abcd567; 2016-03-10, 20:44.

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  • dudesjp
    replied
    Originally posted by abcd567 View Post
    Your heywhatsthat.com range in south is up to Porto Alegre which is about 550 km from your location, and in West is up to Ciudad del Este which is about 520 kms from your location.

    Your actual range in south is almost 300 km. This is very good, but less than achievable.

    I have looked at you installation photos, and I feel the reason for less range is your antenna height. There are tall trees and other buildings/houses around. Your antenna is installed slightly above edge of your roof. The antenna's view of horizon is obstructed by these tall trees and other houses/buildings around.

    You will get much better range if you raise antenna. If possible, raise it above the tree tops and roofs of houses around. If that much is not possible, raise it as much as you can. each meter counts.
    Yes, I took some panoramas today - images bellow - you can see that there is lots of trees and houses surrounding the antenna! I'm afraid that to get a better signal here, i would need a much higher installation!

    Northwest to southeast.
    IMG_3547.jpg

    Southeast to northwest.
    IMG_3548.jpg

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  • abcd567
    replied
    Originally posted by dudesjp View Post
    @abcd567, thank you! Here's the range plot! A little smaller than the maximum possible, but already good! Each circle have 50km! So, my maximum range is a little less than 300km!
    Your heywhatsthat.com range in south is up to Porto Alegre which is about 550 km from your location, and in West is up to Ciudad del Este which is about 520 kms from your location.

    Your actual range in south is almost 300 km. This is very good, but less than achievable.

    I have looked at you installation photos, and I feel the reason for less range is your antenna height. There are tall trees and other buildings/houses around. Your antenna is installed slightly above edge of your roof. The antenna's view of horizon is obstructed by these tall trees and other houses/buildings around.

    You will get much better range if you raise antenna. If possible, raise it above the tree tops and roofs of houses around. If that much is not possible, raise it as much as you can. each meter counts.

    Leave a comment:

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