Constructing a Half-Wave Dipole Antenna for Baofeng UV-82 Radio: Materials, Assembly & Tuning

Hello, I'm a beginner ham (you can call it that)
I have a baofeng uv-82 radio and I would like to build a half-wave dipole for it, but I don't know how to go about it
1. I don't know what materials to use for construction
2. In general, I do not know how to build a dipole (how to connect everything together so that it works as it should)
3. How to choose arm lengths for the right frequency
I am interested in listening on frequencies 136-174 (mainly around 148)
Please help.

Hello. To read. I did ¼λ quickly from post #10, #11-calculation formula. Reception quite good in the city.
https://www.elektroda.pl/rtvforum/topic2878237.html

Take this as a basis:

That is, simply two copper pipes, 50 cm long (75/148=50 formula) with a soldered antenna cable, running parallel to the pipes for a minimum length of 50 cm. And how you put it together mechanically to make it durable - let it remain your invention.

Thanks guys for your help. One more thing, what formula should I use to calculate the length of the tubes because on the forum I met with 3 formulas and each has a different value.

mat134679 wrote:

what formula should I use to calculate the length of the tubes because on the forum I met with 3 formulas and each has a different value.

But what can be miscalculated here? Like a half-wave dipole, it's half a wave. The wavelength is 300/f[MHz]. And the dipole is made of 2 tubes, so each tube is 1/4 wave. And it needs to be shortened by about 5%.

ElekTrick wrote:

mat134679 wrote:

what formula should I use to calculate the length of the tubes because on the forum I met with 3 formulas and each has a different value.

But what can be miscalculated here? Like a half-wave dipole, it's half a wave. The wavelength is 300/f[MHz]. And the dipole is made of 2 tubes, so each tube is 1/4 wave. And it needs to be shortened by about 5%.

I mean that, like a colleague above, he gave me a link to the formula and there are two formulas for calculating the length of the antenna arms
AND
There is a pattern for this:

L = 143/f

f= the frequency at which you want to make the dipole.

Then you divide the result by 2 and you get the length of one arm.

So, at 172MHz it will be like this:

L = 143 / 172
L ~ 0.83
0.83 / 2 = 41.5 cm - one shoulder

II
The basic formula for calculating a 1/2 wave dipole (2x ¼ wave) is:
300 / f / 4 * k = radiator length in meters
Where :
300 - "speed" of light propagation (electromagnetic wave)
f - is the frequency given in MHz
4 - is ¼ wave
k - shortening factor (different for each type of antenna)

And so - for the PSP frequency in the country (average around 149MHz) [and not 172MHz], it is:
300 / 149 / 4 * 0.96 = 0.483 m (48.3 cm) one leg of the dipole times 2 .

And there the gentlemen argued which is good and I do not know how to calculate the length of the antennas for my frequency

Only II and for that we remove unnecessary additional division 300/4 and immediately accept

L = 75 / f * k

75 / 148 * 0.96

What is the impedance of the antenna input of this radio? Because if 300 ohms, it is appropriate to use a loop dipole.

_jta_ wrote:

What is the impedance of the antenna input of this radio? Because if 300 ohms, it is appropriate to use a loop dipole.

mat134679 wrote:

...I have a baofeng uv-82 radio...

Parameters of baofeng UV-82 available on Google without any problem.
Typically these radios have an input impedance of 50Ω.

Don't be surprised, Buddy, if your Baofeng refuses to work with an antenna other than your own.
My UV 82 can "clog up" even with a 0 dB antenna.

I typed into Google "Antennas and antenna installations" - in the first place I got Janusz Bator's book for PLN 4.40 - in this book (not necessarily from Allegro, maybe it is in the library) there is a lot of information about antenna construction and their parameters. As far as I remember, an elementary half-wave dipole is about 150Ω and does not fit into the 50Ω input. But I may be remembering wrong because Ham radio course otherwise - see Antenna types and below Parameters and characteristics of the antennas.

Once you digest this dipole and realize that this construction is not very mobile, I recommend this:
https://vk2zoi.com/articles/half-wave-flower-pot/