50K-500MHz Wideband Active Small Magnetic Loop LZ1AQ Amplifier HF AM FM

T :This does not include the 12V linear power supply, in order to better play the effect, please purchase a high-quality power supply by yourself This version of the small loop is a small-size full-band loop magnetic field active receiving . The receiving frequency range is 50kHz to 500MHz, mainly by the top jumper board, small ring amplifier board, Small loop , feeder, feeder and 12V linear power supply, among which the top jumper board And there are several groups of switches on the small ring amplifier board, and different structures can be realized by adjusting the position of the switches. The small loop of the structure, in which the Mobius loop can achieve twice the voltage gain of the ordinary small loop; The electric field shielding ring can effectively reduce the interference caused by the surrounding electric field, such as lightning, static electricity Discharge, etc.; the structure of the unshielded ring is simple, and the whole small ring can be replaced by a thicker wire, Simple size modification and easy erection. The installation and connection method of this version of the small loop are as follows shown:

This version of the small loop is shpinglist : 1pcs small loop amplification board, 1pcs feeder, 1pcs topjumper board 2pcs small loop s (RG402 coaxial cable) 1pcs 5-meter feeder cable 1pcs 1-meter feeder cable 2pcs non-marking adhesive hooks not include the12V linear power supply The switch positions on the jumper board and the small ring amplifier board determine the structure of the small ring. The structure jumper method is shown in the following figure: 1. Möbius ring switch configuration method

2. Electric field shielding ring switch configuration method 3. Configuration method of unshielded ring switch 4. This amplifier test The amplifier board in the flying fish version of the small loop adopts the low noise amplification of the improved version LZ1AQ implemented with a bandwidth from 50kHz to 500MHz, with a gain greater than 10dB, and a low The input impedance (1.2Q@1MHz) effectively reduces the electric field interference. 12V linear Power supply, the current does not exceed 150mA. The specific test curve of the amplifier board is shown in the following figure: Figure 1 Input impedance test curve Figure 2 Output impedance test curve Figure 3 Output noise floor test curve Figure 4 Gain Test Curve 1 Figure 5 Gain Test Curve 2 5. This feeder test The feeder is mainly to supply power to the small loop , and divide the radio frequency signal into it. The most ant indicators are the insertion lo of the feeder and the saturation of the inductor used by the feeder current. The RF port of the power injector is connected to receiving equment such as a radio or SDR, and the RF+DC end The port is connected to the small loop amplifier. It is strictly prohibited to reverse connection or short circuit if this port has a power supply (there is a 500mA self-recovery insurance, automatic protection after short circuit), DC port is connected to linear power supply, The noise of this power supply will directly act on the and affect the receiving performance. Linear power supply can be used. Or battery pack powered. The actual photos and test curves of the specific feeder are shown in the following figure: Figure 7 Feeder end interface Figure 8 Receiver Ports Figure 9 Feeder Insertion Lo Test 6. Small loop technical indicators: Receiving frequency range: 50kHz to 500MHz Gain: 17dB@10MHz Output noise: -125dBm (@10MHz, BW=100Hz) P1dB: +15.5dBm@10MHz O3: +38dBm@10MHz Supply Voltage: 9V to 12V Supply Current: 130mA to 150mA interface: SMA(M) Output interface: SMA(F) Small Ring Coaxial Cable Model: RG402 Small ring coaxial cable lo: 0.145dB/m Small loop diameter: 60cm References: 1. https://vaedrah.angelfire.com/.htm 2. http://www.lz1aq.signacor.com/docs/wsml/wideband-active-sm-loop-.ht. https://airspy.com/youloop/ 4. https://www.g8jnj.net/moebius-loop- 5. https://www.g8jnj.net/loop-inductance

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