Antena lahan sempit & Vertikal 80/100 M Band AM, SSB

Banyak homebrewer yang ragu untuk membangun pemancar 80m band karena masalah antena. Antena dipole dgn bentuk ‘normal’ akan membutuhkan lahan 2x20meter untuk 1/2 lambda (moga2 benar..) dengan panjang total 40m sangat sulit untuk didapatkan di kota. Bisa dapat paling numpang di tetangga. Setelah jalan2 di dunia maya akhirnya ketemu desain antena Inverted L yang hemat lahan, setidak nya untuk saya. dengan tower triangle yang berdiri di posisi belakang rumah, sangat cocok untuk membangun antena inverted L ini.

Cukup pasang tiang 1 batang di depan rumah dan ujung satunya dititipkan di tower, maka antena inverted L bisa diwujudkan. Alternatif nya adalah pasang 1 batang pipa di dekat feed point dan 2 batang dipasang susun seperti antena teleskopik di ujung satunya. Walaupun tidak sehemat lamah antena 2m band tapi sudah cukup banyak reduksi daripada original dipole. Gambar diatas adalah untuk multiband, tepatnya 3 band yaitu 160, 80 dan 40m band dengan trap untuk tiap band nya.

Downloads keterangan lengkapnya di https://nyolder.files.wordpress.com/2012/04/160-80-40m-end-fed-antenna-g0csk-iss-1-11.pdf

Sumber halaman: http://nyolder.wordpress.com/category/amateur-radio/

SuperLoop 80m Antenna

Antenna ini di operasikan pada band 80mband. Dengan ukuran sebagai berikut:
top/horizontal section = 34.14 mtr
verikal section/matching stub/tangga monyet 9.14 mtr. Di operasikan dengan balun 4:1
Diambil dari sumber: http://larc.hamgate.net/SuperLoop.htm

80 meters band linear loaded dipole

An easy way to ‘fly’ on eighty meters band. Ideal for limited space.

How start:
When I was amateur radio I looking for a high efficiency antenna which need limited space on
eighty meters band. This happen because my neighbourhoods don’t leave me to prop a simple
wire. Well I find a way to solve my problem. Searching on antenna book find a half slope for
one hundred and sixty meters band. Great idea I think! If I split the dimensions to two I will
have an antenna on double frequency. So I try it with a big success.

Construction:
To build this antenna I use a 10 meters pole, 44 meters wire, a small pieces of insulators and
rope. Two pieces poles 3 meters to prop the ends. (On my antenna the ends supported on
balcony).
The construction it’s the same like any other dipole antenna except the loads at the ends.
The loads it’s a simple wire which make inversion and come back to pole, us you can see on
the scheme. They need good support. Nothing else.

Results:
Let’ s get started from the… SWR! OK. The SWR is 1,8÷1 on tuned frequency (3,650MHz).
That means impedance is not so close to 50 Ω but who cares! I reduce that when I use a
simple antenna tuner.
Now it’ s time to test it. I have not use any other full size dipole to test this antenna but I can
say in a few words, my transceiver ‘fill’ with strong signals! For example 9+40 from my
country! 9+30 from other European countries! etc. Yes indeed. This is not something special or
something ‘super dooper’ but really works good and cover distance more than 3.000 km.
I hope enjoy it.

Good luck de SV1CDY George J. Orfanos, Athens – Greece

Untuk lebih lengkapnya bisa kunjungi http://www.mds975.co.uk/Content/amateur_radio_antennas_04.html

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ANTEMA FERTIKAL UNTUK PEMANCAR AM 80 BAND GELOMBANG RADIO DI SW1 ANTARA 3,4 – 4.O MHZ

                                                                        VERTICAL ANTENA