The general connection diagram is shown in the figure. The red numbers in the figure correspond to the positions in the table “kit structure” and the numbers in the text.
Antennas (1, 2) should be installed on the roof of the building or in another place with the best possible view of the sky. Buildings, trees, superstructures, etc. that narrow the horizon make reception difficult. Antennas are recommended to be mounted on pipes, that is, vertical pipes fixed to the roof - for this, appropriate fastenings are included (5). Two antennas should be placed at a distance of 1.5..2.5 m from each other. If there are no pipes on the roof, it is technically possible to fasten them to the railing posts (if the rules for operating your roof allow this), or to specially installed brackets (they are cheap and freely available in any store that sells satellite dishes), or, in the case of a flat horizontal roof, onto a heavy metal sheet or frame with a pipe attached to it.
Before installation, the mounting pipes of the antennas are built up using extension cords (3) included in the kit and corresponding fasteners (4).
Antennas must be grounded to ensure lightning protection! Lack of grounding is life threatening! Grounding can be provided by grounding the masts, on which are installed antennas, and, in addition, by grounding the antennas themselves onto the circuit lightning protection of the roof using the supplied grounding cables (11) (rigid; the supplied flexible cable (12) is intended for indoor use). On antennas, the cable is fixed with the same screw that is used to connect the antenna and extension cord.
The antenna diplexer-amplifier (9) can be mounted both on the mast and on other elements of the roof with the help of the supplied clamp or some other fasteners.
It is important that the side with connectors and inscriptions is on the bottom, since it is on this side a drainage hole is located to remove condensate. Wires from antennas connected to the corresponding inputs of the diplexer-amplifier. Important not to confuse entrances. The antenna of the range 136-146 MHz is approximately three times larger than the antenna of the range 435- 438 MHz. It is allowed to leave one of the inputs unconnected. To amplifier output feeder cable (6) is connected. The feeder cable runs to the installation site workstation.
Installing the workstation itself is no different from installing any other a computer. The SDR receiver can be connected to an arbitrary USB port, but it is advisable to select a port so that the receiver is not broken by someone careless movement.
The feeder cable is connected to the adapter (8) with a grounding contact. This contact is grounded using a flexible wire (12). Although the antenna is grounded, it is also important to ground the bottom end of the cable reliably, as it is not too distant when struck lightning in the cable sheath will induce current (as on the secondary winding of the transformer), which in the absence of a path to the ground, the receiver may be damaged.
Next, the SDR receiver is connected to the adapter using a flexible patch cord (7). After connecting the power, the station is ready for operation.