Hi,
Welcome to ham radio and the microBitX. Much of what the others have told you is spot on. I only want to point out that a dipoles is close to 75 Ohms when it is high above ground in terms of wavelength. That is easy to do for the higher frequencies. We can almost reach those standing on the ground. Even then it may not be exactly 75 Ohms.
If you have everything specified at 50 Ohms - radio, coax, antenna and then somethings turns out to be actually 49 or 51 Ohms it will not matter. With a chunk of 75 Ohm coax mixed in there some part of the system is going see about 1.5 to 1 - SWRatio. That really is inconsequential. How much of that can be tolerated varies a lot according to how much the various parts of the system can tolerate. Probably 2 or 3 to 1 is still usable. Been there - done that. If the manufacturer specifies 50.00000 Ohms and 50.000001 Ohms will fry the radio and 49.999999 will make it shut then get exactly 50.000000 Ohms. Better yet - get a different radio :)
Getting the best SWR by pruning the antenna is crude and not technically the best way to set up your antenna. Doing it a better way is for some later time. Meanwhile, Get on the air and get your feet wet - the crude way will get you most of the way there:)
See you on the air.
73,
Bill KU8H
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On 09/08/2018 03:32 PM, gonewiththeego@... wrote:
Oh, thanks! I'm looking for an SWR-meter meanwhile. And about the balun
? Is it a "MUST HAVE" ?
--
bark less - wag more
