Tip & How-To about Audio Players & Recorders

Building your own Antennas

To build antennas for any frequency use formula L=234/Freq. Lets say 100 mhz. That would be L=2.34 feet or about 30 inches(close). Ok, Build a dipole antenna with a plastic insulator and 75 ohm Tv Coax. Take stiff alumnium rods or wire. Punch a hole into a plastic piece 4 inches apart. Insert Rods on both sides. Take shiny screws (Not Painted). attach Center Coax to Right side and Shield (ground) to Left side. Silicone these connections and use Black tape to wrap it good. Mount it on your Chimney or on a Tv pole 12-25 feet. Now, the coax coming into your house has to hook to your stereo by a 75 ohm match coil bought cheap at Electronic stores or Tv, radio supply stores. Attach coax by screwing it to coil and the two prongs screw to Back of your Fm Stereo. It will say ANT and GND. on back of Radio. You should pull in Fm stations better than indoor antennas and get farther away stations. It may have a 3 Db gain. Its the same for Cb radio --Just Use L=234/Freq. it comes to 8.5 feet(102 inches) Roughly. Its all Dipole Technology ..No Commercial antenna but will get decent results.

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how can a make an equivalent to a Telex St 200 1/2 wave dipole antenna?


it is either 72MHz or 216MHz. There r a lot of utube videos on DIY Dipoles but u must change the length to match the frequency.
A VHF TV antenna will work for 72. Length = 39" each side-- 216MHz is going to be 13" - total will be about 80" and 28"
The issue is the matching xformer. A dipole presents 300 ohm impedance. The 200 is a 50 ohm Z. a typical TV matching xfmr is 300 to 75 so u will have to build the right one of maybe find one in a HAM store.
Google this - 1/2 wave dipole ham - for lots of ideas

Dec 11, 2014 | Radio Communications

1 Answer

other people cannot hear me


The problem is related the polarization of the two antennas you and your friend are using. You are using a dipole antenna which is polarized horizontally and you friends using an upsidedown whip which is vertically polarized. My advice is as close as you are, is hang your dipole from something high enough that the top say is hung in a tree or off a tower and other end of the dipole is attached to an anchor in the ground. You have basically made a full wavelength vertical, which you friend should build himself.

Feb 01, 2014 | Midland Radio Communications

1 Answer

I want to build a antenna for channels 2-6.


go to a repair shop they have every thing you need

Aug 25, 2009 | Televison & Video

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