Hi Guys I have a CZE 7 watt fm transmitter, I was wondering if I can make a vertical mounted dipole. Here's the plans 12 mm aluminium tubing cut in two pieces at 4.66 ft each which are terminated in a junction box with a 50 ohm feed line. This will be about 6 metres away from the transmitter. Please reply asap
Sounds like it should work fine. Just make sure to make a current balun, which is nothing more than 5-6 turns of coax around 6" diameter to choke off common mode currents near the antenna feed point (not transmitter feed point).
It is really best of you work with materials that are easier to cut/trim since it is possible you will not hit the frequency spot on first time around. Usually with dipoles you use the average measurement plus an inch or two on each end, then install at the location and check SWR and see if it needs to be shortened to resonate with lower SWR.
BTW it should be 4.66" total length from end to end, not each "leg" or element.
You can learn a lot by looking at ham radio websites describing how to design a basic dipole and using those calculations and information to build yours for broadcast FM.
Thanks for the great info I will post pictures soon when it is made. Will that make my transmitter be able to reach 3-4 kms range. It will be on top of a big hill.
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