» Antennas »Tunable active antenna on DVB-T2

Tunable Active Antenna on DVB-T2

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Want to add. Judging by the photographs and the description, amplifiers and power supplies from the widespread antennas of the MV + UHF bands are suitable for this antenna. For example, Hummingbird or Polish. I don’t remember the “Polish" brand, we called them that. Moreover, the latter on the power supply (injector) has a knob for adjusting the output voltage. This allows you to adjust the gain of the received signal, which is sometimes necessary, especially in a city where the level of radio interference is high.

You also need to keep in mind that the amplifiers of the "Polish" antennas are sometimes sold separately (without an antenna) or, if you agree with the seller, you can change them. These amplifiers differ in the gain set during manufacture. In a simple way they call it: two, three ... and so on. You can, if desired, find out how many decibels. Two is the smallest gain. In villages, villages, at a great distance from the tower and at a low level of industrial and other interference, they put amplifiers with greater gain, and in cities with less amplification. Otherwise, a poor performance of such an antenna is possible.

By the way, from the above antennas, in addition to the amplifier and power injector, you can take an aluminum bar and fasteners for the manufacture of this antenna. And the cable with the connector usually came in the kit. good
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There is no scheme.
0
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Amplifier circuit apparently not?
Author 0
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This is a modified ring vibrator, the length of which is calculated - 300 / wavelength.
The extreme frequencies are taken in the desired tunable range, taking into account the size of the jumper.
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The formula for what was considered in the studio please!

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