Simple Antenna Amplifier

The more I get to know the modern element base, the more I'm surprised at how easy it is to make such electronic devices, which you could only dream of earlier. For example, the antenna amplifier, which will be discussed, has a working frequency range from 50 MHz to 4000 MHz. Yes, almost 4 GHz! In the days of my youth, it was just possible to dream of such a thing, but now such a power amplifier on a single tiny chip can be assembled even by an aspiring radio amateur. And having no experience with over-high-frequency circuitry. The antenna amplifier presented below is extremely simple to manufacture. It has good gain, low noise and low current consumption. Plus a very wide range of work. Yes, and also a miniature size, thanks to which it can be embedded anywhere.

Where can I use a universal antenna amplifier?

Yes, almost anywhere in the wide range of 50 MHz - 4000 MHz.
  • -As a television antenna signal amplifier for receiving both digital,and analog channels.
  • -As an antenna amplifier for an FM receiver.
  • - others.
This is for household use, and in the radio amateur sphere of application much more.

Antenna amplifier characteristics

  • Operating range: 50 MHz - 4000 MHz.
  • Gain: 22.8 dB - 144 MHz, 20.5 dB - 432 MHz, 12.1 dB - 1296 MHz.
  • Coefficient noise: 0.6 dB - 144 MHz, 0.65 dB - 432 MHz, 0.8 dB - 1296 MHz.
  • The current consumption is about 25 mA.
More detailed specifications can be found in the datasheet SPF5043Z. The low-noise amplifier is perfect commanded. Low current consumption quite justifies itself. Also, the chip perfectly withstand high-frequency overload without loss of characteristics.

Making an Antenna Amplifier


Simple Universal Antenna Amplifier
The circuit uses the firmware RFMD SPF5043Z, which can be bought on -AliExpress. In effect, the whole circuit is an amplifier and filter for its power.

Amplifier board

Simple universal antenna amplifier
The board can be made from foil-shaped textolite, even without etching,as I did. Take a two-sided foil-shaped textolite and cut out a rectangle measuring approximately 15x20 mm.
Simple Universal Antenna Amplifier
Then, with a permanent marker, draw a line on the layout. Simple Universal Antenna AmplifierSimple Universal Antenna Amplifier And then you want to poison, and you want to cut tracks mechanically.
Simple Universal Antenna Amplifier
Then we all tin with soldering iron and solder SMD elements of size 0603. The lower side of the foil board is closed to the common wire, thereby shielding the substrate.
Simple Universal Antenna Amplifier
Simple Universal Antenna Amplifier

Tuning and Testing

Tuning is not required, you can of course measure the input voltage, which should be within 3.3 V and consumed the current is approximately 25 mA. Also, if you are working in a range above 1 GHz, you may need to match the input loop,reducing the capacitor to 9 pF. We connect the board to the antenna. The test showed good gain and low noise.
Simple Universal Antenna Amplifier
It will be very good if you place the board in a shielded case, such as this.
Simple Universal Antenna Amplifier
The board of an already prepared amplifier can be bought onAliExpress, but it costs several times more than the chip separately. So it is better to be confused as it seems to me.
Simple Universal Antenna Amplifier

Addendum of the circuit

The power supply of the circuit requires a voltage of 3.3 V. This is not very convenient, for example, if you use an amplifier in a car with a 12 volt vehicle voltage.
Simple Universal Antenna Amplifier
For these purposes, you can enter a stabilizer in the circuit.

Connect the amplifier to the antenna

By location, the amplifier should be placed directly proximity to the antenna. For protection against static and thunderstorms, it is desirable that the antenna be closed to DC, that is, you must use a loop or frame vibrator.

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