Impedance transformer or antenna amplifier - what is the difference and which on

Question

Returning to the previous topic I would like to know what the impedance transformer gives, isn't it better to install an antenna amplifier in my case?

irekr · Answer

The amplifier is most often equipped with a balun. Amplifiers should be used only where the signals are really weak and the transmitters are distant. The amplifier is not intended to correct the bad parameters of the antenna. If you live where you specified in the topic, then with a properly made antenna, the amplifier is unnecessary or even inadvisable. A balun must be installed.

Jankesik · Answer

The balun is not too expensive (about PLN 5) So I will buy an antenna with an amplifier. If the reception is too strong, I will remove the amplifier and install a balun. What do you think about it How do you think if you pick up TVP1 and TVP2 with this antenna Antenna: UHF Dipol 44 / 21-69 Tri Digit antenna location anniversaries The antenna is mounted on a 4-story block Cable length 25m

rzeszutek1 · Answer

The balun is used to match the impedance of the antenna to the impedance of the receiver, cable, etc. Let's say that the receiver has an antenna socket with an impedance of 75 Ohm, we use a coaxial cable with the same impedance, and we need to connect it to a dipole antenna with an impedance of 300 Ohm. We then need a balun between the antenna and the cable to match these impedances. In short, if the antenna has a different impedance from the receiver, first you need to mount an impedance transformer, and then, if necessary, amplify the signal with an amplifier. If there is no impedance matching of all components, distortions (signal reflection) and more are created, so there is no point in using an amplifier without first matching impedance with a balun. To sum up, always a balun, and then possibly an amplifier, or 2 in 1.

Jankesik · Answer

Is it possible to check the impedance of the receiver in advance? For example, if I give you a TV model Orion TV32FX500D

rzeszutek1 · Answer

What is the socket? If the concentric is 75 OHM, if the two pins are 300 OHM. Hehe is brand new TV, so 75 OHM for sure

matis057 · Answer

Televisions from the '90s already have a 75 ? socket. Older TVs had a symmetrical 300 ?

Jankesik · Answer

So in the case of my TV, the symmetrizator will probably not be needed? And the antenna amplifier would rather be useful to me to receive TVP1 and TVP2

rzeszutek1 · Answer

Exactly. In this particular case, you don't have to. Or rather, you need to buy a 75 OHM coaxial cable . Added after 2 [minutes]: And whether the amplifier will be needed, it will turn out after assembly. If you have to, you can buy it later. The antenna has a very high gain, so you probably won't need an amplifier.

Jankesik · Answer

I will buy the cable that was given to me earlier I need about 27m. Do I lose quality with such a long cable?

Anonymous · Answer

it is lost at the signal level, in the case of the replaced cable ~ 4.5dB, i.e. the signal will decrease ~ 4x. But, in general, if the signal received by the antenna is good, it doesn't have to be a problem. For outdoor installation, there should be a cable made for outdoor use, made of PE (in color black ). So, like the one you showed, but in such execution.

rzeszutek1 · Answer

Each cable, apart from weakening the signal, will cause some distortions, because it is not a perfect waveguide (there will be some reflections, etc.), but there is probably no other option, so there is no need to think about this topic. I would rather be worried about the drop in signal level.

Jankesik · Answer

So I have to buy this cable and not the one I mentioned earlier

Anonymous · Answer

yes, this one or similar, also in PE and in black.

matis057 · Answer

Moment... If the colleague has nothing in the antenna box, then a balun must be installed. If the signal is too weak, the amplifier and antenna power supply will be needed.

Jankesik · Answer

Okay, let's put it all together If the signal is too weak, I install an antenna amplifier On the other hand, if the signal is fine, I mount the simulator without the amplifier Do I have to assemble this symmetizer in case of good reception? I think right or not

rzeszutek1 · Answer

If we are talking about this specific case, then an additional impedance transformer is not used here, because all elements have an impedance of 75 Ohm - such a balun is already in the box. However, if the signal is too weak, you will have to buy an amplifier. Amen

Jankesik · Answer

So I have to understand if the reception is ok, I do not put anything in the antenna box Okay, 1 last question. Is this antenna amplifier ok for this antenna

rzeszutek1 · Answer

You understand well. However, the amplifier itself is not suitable. As you can see, it is adapted to an antenna with an impedance of 300 OHM (so it includes a balun). Here you will need an amplifier with I / O at 75 Ohm (for short, concentric terminals on both sides).

Anonymous · Answer

What's this nonsense? Do you know what you are writing about?

rzeszutek1 · Answer

On the other hand, a balun is already installed in this antenna box.

Jankesik · Answer

Gentlemen, I am asking someone for a final answer. What should I install in this box? And will the photo of the amplifier I gave above fit?

Anonymous · Answer

Do you have an X-ray? And delete your nonsense from previous posts.

rzeszutek1 · Answer

A friend wants to buy a symmetrizator. The antenna, on the other hand, has an impedance of 75 Ohm, so as I wrote above, it is already in the box.

Anonymous · Answer

The balun! If the signal is too weak, you need to adjust the amplifier, of course, power it from 5 to 12 V. [

Jankesik · Answer

This antenna

Anonymous · Answer

ATX? :?: Added after 3 [minutes]: Depending on the order. May include an amplifier. It is sold for nothing.

Jankesik · Answer

I close the topic because a few people have caused confusion and chaos here

G.R. · Answer

And how does it relate to the BiQuad antenna, what do you need an amplifier or a balun?

irekr · Answer

Each amplifier - except amplifiers for logarithmic antennas - has a balun. There is an impedance problem with BiQuad antennas as these antennas have a resistance of 50 to 90 ohms depending on the design. A compromise solution is to use a balun from ASR Telmora antennas, which have a 1: 1 ratio (75 ohms symmetrical to 75 ohms unbalanced). The amplifier is used only where absolutely necessary. DVB-T2 tuners and decoders in receivers have a very high sensitivity, sometimes even too high. I ignore the problem of the quality of these amplifiers, not meeting the requirements.

Impedance transformer or antenna amplifier - what is the difference and which on

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