To calibrate, to establish or verify the performance of the radio equipment in the frequency range of 1-75 MHz allows this device. His scheme (Fig. 1) comprises a generator-the”type” with capacitive connection is made to the transistor V1. The oscillator frequency and its harmonics determine the replacement of quartz resonators B1, connected via connectors X1—X3.QUARTZ CALIBRATOR
To calibrate, to establish or verify the performance of the radio equipment in the frequency range of 1-75 MHz allows this device. His scheme (Fig. 1) comprises a generator-the”type” with capacitive connection is made to the transistor V1. The oscillator frequency and its harmonics determine the replacement of quartz resonators B1, connected via connectors X1—X3.
Homemade mikromototsikly built using bicycle parts and children’s scooters, gaining among our youth is growing in popularity This is quite natural: a miniature car garage is not needed, it can be kept even in the apartment; its cost (both initial costs and maintenance costs) is very small; learn how to manage such a machine can be a few hours, and how many interesting trips will allow it to make, especially in the countryside!
In the fourth issue of the journal for the year 1978, published schemes of electric locks with a “secret”. They all work well, but they, in my opinion, there is one drawback: the locks can not be powered from a DC source. I propose a scheme for electronic lock, the key to which is the resistor. Here’s how it works. When the terminals X1 and x2 (see diagram) connect the resistor R2, transistor V1, the base voltage goes negative, opens and relay K1 is triggered.
Svobodnaya radio control model airplanes, gliders and helicopters is currently being implemented with the help of tiny transmitters that have levers or buttons to apply for the model of the desired commands. All of these devices have nothing to do with the controls of a real aircraft and need to develop specific skills and reactions. This means that the experience of control appears to be useless in the future, say, in the case of the transition has mastered them to the training flights in a glider, and especially on the plane.
To fill the tank of a car in the field — for example, from a barrel or tank of the other vehicle drivers often use a simple hose and the so-called “sucking method”, creating a vacuum mouth, with a hit of petrol. You can avoid trouble if you make a simple mini-pump. For this elastic (flexible) hose with a diameter of 10 — 15mm in length 1 — 1,5 m at a distance of one third the length of the slot and insert the hole with a diameter of 10 mm nozzle length 50 — 70 mm from the same hose, and into it insert the tip of the medical pears (preferably the largest). In the end you will have a trouble free, simple in construction, durable pump (even if he is lying among the tools in the trunk — one piece of his there was nothing to fear).
Readers of radio-controlled model copy of the missile and aircraft interceptor BI-1, the parameters of which correspond to rocket gliders S8F Recall that this flying class combines the model with a mass of 500 g with engines of 40 — 80 N.with. Among the requirements for models of this class — the prohibition of splitting the model into two or more parts (including the engine after the trigger should remain in the container). Besides the active part of the flight (take-off) should be straightforward — ascending spiral and loop invalid. Maximum measuring time of flight of the models in this class is 300 seconds.
Almost all users as a stationary radio stations (including those intended for civil radio on 27 MHz), and automobile radios and 4M AM (amplitude and frequency modulation) are faced with the need for optimal coordination of antenna-feeder devices (hereinafter — AFD) with the transmitter. To increase the range of a portable (wearable) mobile stations are sometimes also connected to respective external antenna, for Example, in the CBS range on an antenna called “5/8” vertical polarization and pin around 1450 mm That is the solution of the mentioned problem is important for all radio Amateurs with an active and effective (long-distance) communications.
