Central Radio and the central section of radio amateurs by the Central Committee of SVAZARM, direct all the activities of the Czechoslovak radio amateurs provide them all possible assistance in improving their skills to attract the participation of various e mass sports events.
In September 1955, short wave radio amateurs have done a great job of radio coverage XXX International motorcycle competition held city Gottwald.
SVAZARM Radio operators who are with their radios on all transit riders, ensure reliable radio communication in the competition.
Performed well during the first amateur radio operators nationwide Olympics and Prague in June-July 1955.
Last year, our company spends more ski competition, which was attended by 323,000 members and other mass organizations. In these competitions, our hams and stir-short wave. .Place Your radio at all stages of ski racing, they quickly transmit information on the progress of the competition.
Czechoslovak-short wave radio amateurs willing to come to the aid of workers in agriculture.
Significant progress achieved our ultrakorotkovolnoviki, especially in the development of the high frequency range. This is shown installed in 1954 Czechoslovak stations OKKAH OKKIS and radio at a distance of 200 km in the range of 1215 MHz, which is the world achievement. In spring 1955 the Czechoslovak radio amateurs in Brno for the first time achieved due at centimeter wavelengths in the range of 3300 MHz at a distance of 500 meters.
In recent years, increased skill-Czechoslovak radio amateurs designers. On the third exhibition of national amateur works, which was attended by more than 20 thousand inhabitants of Prague, in addition to ordinary amateur receivers, transmitters, televisions, tape recorders, measuring instruments and other equipment, Czechoslovak radio amateurs also showed electronic equipment for the introduction of radio techniques in the domestic industry. Among them, for example, a device for determining the quality of concrete and other electronic equipment.
Amateur radio activities contributes greatly to the development of television in our country. A number of cities have successfully conducted experiments on the distant receiving television broadcasts.
An important event for radio Czechoslovakia was the participation in international competitions hams, which were held in 1955 and the honor of the radio in the USSR. In these competitions Czechoslovak short wave runner-up, followed by the team of the USSR.
Friendly relations between the Czechoslovak and Soviet radio amateurs are continuously expanding and growing stronger. This contributes to joint participation in many international competitions. Well established as an amateur radio operators of the people’s democracy.
With the help of Soviet radio amateurs and exchange experience with DOSAAF, with whom we work closely, amateur radio in Czechoslovakia is becoming more widespread development. For example, the experience of organizing and holding international competitions skorostnikov-radio operators in Leningrad in 1954, in which the Czechoslovak radio amateurs took third place, has taught our radio operators. Since then, Czechoslovakia had already conducted several regional competitions skorostnikov. This will help us better prepare for international competitions skorostnikov-radio operators, which will be held this year in Karlovy Vary.
From year to year in the country a growing number of amateur radio operators. We have more and more become great athletes — the real masters of their craft. Last year, in connection with the 60th anniversary of the invention of the radio, for achievements in international competitions in Leningrad, for the active and excellent work in the field of amateur radio for the first time awarded the 16 best country hams master of sports.
Hams Czechoslovak Republic have considerable achievements. However, this is only the first steps towards addressing the large and important tasks facing the amateur radio movement in our country.
Now developed a number of different electronic devices that have been successfully applied for prospecting and exploration of mineral resources. However, the absence of certain types of equipment greatly reduces the efficiency of exploration.
The participation of radio amateurs and radio personnel and the development of new instruments will help solve a number of important challenges facing the exploration organizations.
Such participation should be taken in the development of the equipment specified below.
To conduct seismic operations in remote areas need to develop a portable seismic station, which is the primary node of voltage amplifier block of the low frequency amplifiers 12-26 (number of recording channels).
For such stations need to develop cost-effective portable amplifier having a small size and weight. These amplifiers must amplify the voltage in the frequency range of 30-350 Hz and filters have high and low frequencies. The cutoff frequency of the high pass filter should be 30, 60, 90, 130 and 180 Hz. The low pass filter should have a cut-off frequencies of 250, 180, 130, 90 and 60 Hz. The steepness of the frequency characteristics of the high pass filter should be at least 30 dB per octave and a lowpass filter is not less than 15 dB per octave.
The output of the amplifier is connected loopback mirror galvanometer. The input resistance of the galvanometer circuit is 50 ohms, and current sensitivity — and
— The sensitivity of the channel «Input Amplifier — galvanometer» shall be not less than 3 microamps / cm. The unit, consisting of twelve amplifiers should weigh no more than 5-6 kg. Phase shifts and all channels within the «Input Amplifier — galvanometer» should not exceed 12 ° in the operating frequency range.
Zhuravlev, N. Grin
Typically, the electrical oscillations of seismographs during seismic amplifiers are input to a seismic station at special wires. To work in remote areas where it is impossible to use the wires necessary to develop equipment that allows to transmit electrical vibrations from the geophones to the station on the radio.
The number of unrelated channels a station must be at least 12, while maintaining all of the above requirements to the portable seismic stations.
It is necessary to develop a tool to search for ore bodies in the spaces between the galleries by radiographic (shadow method). This method is based on the phenomenon of the absorption of electromagnetic energy ore bodies located between the generator and the receiver. The range of the instrument must be at least 50 m. For radiography can be used in the frequency range of 1 MHz, T-’10.
To study the physical properties of rocks, you must create a device that would allow the measurement of residual magnetization and magnetic permeability of the rocks in their natural occurrence.
In carrying out geophysical researches in wells (well logging) is required to accurately determine the length of the cable, as this makes it possible to determine the exact position of the device is lowered into the well on a cable.
Therefore it is necessary to develop equipment that allows to set the length of the cable is lowered into the hole up to 0.5 m at a depth of up to 1000 m.
It is also necessary to create a device with which it would be possible to determine the break cable cores and the leaks of the current in the winding of the cable on the drum or finding it in the hole.
For the analysis of hydro-geological processes necessary to have data on the fluctuations in groundwater levels in wells and dug wells, depending on the time. Currently, there are devices Poplavskiy type for automatic registration of water levels in wells and wells. However, these devices do not spend pozvolyayut- liquid level measurements with the required accuracy (about 2-3 mm) poi amplitude changes in the level of the liquid up to a few meters.
It is necessary to develop equipment that allows continuous recording fluctuations in the level of the liquid up to 2 mm, and fluctuations with an amplitude of 1 m, and the vibrations with amplitudes up to 10 mm precision Yuma. Continuous recording level of at least ten days.
The widespread introduction in the exploration method aerial observations hampered by the lack of necessary equipment for recording observations. As an instrument for the registration of such observations could be used malogaberitny tape. Such a device should be capable of continuous recording through a throat microphone for two hours, have a separate power supply and tape drive spring. The weight of the device must be not more than 10 kg.
For land mobile radio geological units is the primary means of communication. However, the industry supplied radio justified only as divisions Geological Survey, are more or less long time in one place or having in his part of the vehicles. For radio and film databases of search parties with their mobile units, having in its composition two or three people, you need a portable receiving and transmitting radio telephone adapted for carrying one person across rugged and wooded area. This station should provide bespodstroechnuyu radio communication with the radio equivalent to a distance of 30 km, at any time of day and year and in all conditions areas. Power supplies must provide work stations for six days in communication twice daily for ten minutes, and the interval between communication sessions 8 hours. Weight and dimensions stations must be minimized.
In one article it is not possible to give a complete list of all the necessary equipment, as well as bring the full specifications for the electronic equipment necessary for exploration services. Radio personnel wishing to participate in the development of such equipment can get more information in the Technical Department of the Ministry of Geology and Mineral Protection of the USSR,
Almost all electronic equipment in varying degrees requires for its production of magnetic materials. At present, widely used magnetic material gets called oksifer.
Oksifery characterized by high resistivity (105-106 times higher than that of metals), low-loss, constancy and high initial value of the magnetic permeability, high mechanical strength, the presence of magnetostriction effect and other important properties. With mass production of these materials reduces the use of the equipment.
The starting materials used for oksiferov sulfates metals. Because ferrite powder pressed parts required shape, which are then sintered for several hours at high temperature.
The Q-factor inductors with cores oksiferovymi much higher Q factor coils’ cores made of carbonyl iron, having the same dimensions. For example, at frequencies of about 100 kHz in the coils to the cores can be easily oksiferovymi receive quality factor -r- 625 to 500.
The most widely used radio ferromagnetic oxide obtained as cores of various kinds of transformers and chokes.
The transformers for the transmission frequency band from 50 kHz to 1000 approaches the upper limit frequency value of the magnetic permeability generally decreases. If we apply the sheet material is to create a sufficient level of permeability has to choose the thickness of the sheet too small and therefore to abandon armored cores and move on to the spiral. Broievye oksifera of cores can be used at frequencies up to 2000 kHz or higher. By using special types of high-quality brand oksifera
«RChgt; broadband transformers can be designed to operate in the range of 100-16 000 kHz and pulse transformers that can transmit a pulse duration of less than 0.1 necks. Good results are obtained by using cores in transformers oksiferovyh horizontal in television.
Oksifery magnetostriction can be used in devices (e.g., ultrasonic transmitter and receiver), a notch filter, and so on. N.
Good results were obtained with oksiferovyh
& Fairy of I * g’e 45 ii
Ras. 7 cores for inductors magnetic amplifiers operating at frequencies up to 100 kHz. In such devices, the core section is usually attached to an uneven, it is necessary to saturate the magnetic circuit portion.
Oksiferovye cores are used in various types of non-linear elements of the wireless devices (such as generators, harmonics).
Oksifer used in some cases to increase the inductance of coaxial cables, as well as modulators and attenuators in waveguides. Due to the high dielectric constant (about 105) speed "propagation of an electromagnetic wave in oksifere small (about 30 km / sec), which makes it possible to use this material in the delay lines.
High dielectric properties oksifera allow high-frequency transformer winding applied by printing directly on the core of oksifera.
Recently oksifer is widely used in miniature motors and AC generators of sound frequencies. The stator of such a motor usually done oksifera NS, and the rotor is either oksifera or metal depending on the range of operating frequencies and operating conditions. Armature winding in some cases, it also makes sense to perform a printing method.
Permeability oksiferov heavily dependent on the external magnetic field. This property of them can be used in the transmitting device to change the inductance circuits. A wide range of overlap is achieved in this case the change of the current in the magnetizing winding core circuit. In the magnetic inductance of the vario when this adjustment varies 100-7-150 times. Magnetic variometers make it possible to perform remote configuration circuits. The nature of the changes the inductance of the coil with oksiferovym core, depending on the variation of the bias magnetic field is shown in Fig. 1.
Oksifery also find use in electronic computers (e.g., its storage elements).
Oksifery should be used in the magnetic antenna on the range up to 20 MHz. In this case, along with a decrease in the size of the receiver increases its sensitivity and selectivity.
Oxide ferromagnets discussed in this article are the most widely used in various branches of engineering. Some types of ferromagnetic materials also possess the properties of semiconductors. Materials of this type over time, likely will replace some of the more expensive and less convenient materials.
Simple superheterodyne on lamps finger-Series has two ranges of low wave — from 150 to 415 kHz (2000-723 m) and medium-from 520 to 1600 kHz (577-187 m). Receiver sensitivity on both bands better than 150 uV, and the selectivity of above 20 up. When the output power of 0.5 Islands THD does not exceed 10 ° / o. The bandwidth of the entire tract of the radio ranges from 100 to 4000 Hz at 5 dB. Sensitivity to the phono jack — 200 mV, and the background level — not higher than — 26 dB. Due to the low anode voltage and the absence of rectifying lamps radio consumes the network no more than 20 watts.
Schematic diagram of the radio is shown in Fig. 1. Frequency conversion is carried out on Finger pentagrid converter type 6A2P (A ). The control grid circuit this lamp with a switch P b align input circuits — medium wave (L2, C4, C2) and long wavelength (C3 and C4). These contours are inductively coupled to the antenna by means of coils L, and L3. The capacitor C is in the antenna circuit, to protect the coil from damage due to accidental contact with the antenna passes electric lighting network.
The local oscillator of the transmitter is made under the scheme trehtochki with high frequency grounded anode, which performs the function of a screen mesh. The contours of the local oscillator sredievoliovogo (L7, Cl, Sa and Su)) and long-wave (La, St., C} See Mr. Xu) ranges are included in the chain of control grid.
In the anode circuit of the inverter circuit switched intermediate frequency transformer C13 Ls, tuned to the frequency 465 kHz. Fluctuations in the intermediate frequency, reinforced lamp 6K4P
(A2) and the selected path CtsLg, are fed via a capacitor C to the detector, working on a semiconductor diode type DG-TS7 (№). The load detector comprises a potentiometer resistance, which also serves as a volume control. Fluctuations in low frequency, this taken from the potentiometer are fed through a coupling capacitor C ^ to the control grid of the tube 6ZHZP (A3) working preamp Bass.
At this stage there are no bias resistors and a capacitor blocks it include conventional cathode lamps in series. The negative bias voltage necessary for the normal operation of the lamp LZ, turns on the resistance due to current control grid lamp.
Reinforced lamp L3 low-frequency vibrations coming through capacitor control grid lamp 6P1P final stage (L4).
Meals screen grids of the first two lamps through common dropping resistor and a third lamp — through resistance
To minimize distortion when receiving strong or nearby radio receiver has an automatic gain control. AGC voltage is removed from the load detector and a filter is applied to the control grid of lamps L1 and L2. For better sound quality in the receiver applied negative feedback ‘stress, which covered the final stage of the receiver. Negative feedback is created as a result of the connection of the anode terminal lamp with its control grid via a capacitor C21. Negative feedback equalizes a frequency response in the upper audio frequency.
Power is provided from the radio odiopoluperiodiogo rectifier, assembled on the planar semiconductor diode type DW-TS24 (KP2 and CNG). These diodes with a current of 50 mA can withstand reverse voltages up to 200. Since the receiver consumes a current of 35 mA and the reverse voltage does not exceed 350, that uses two diode DW-TS24 connected in series. However junction diodes have a significant variation in the reverse resistance and a series connection of diode reverse voltage on them are unevenly distributed. This in turn can cause failure of the diodes due to sequential breakdown. S To select the reverse resistance of the diode, resistors are shunted leveling
Contoured coil wound on a cylindrical scaffolds vypoliennyh organic glass or hard rubber with a diameter of 12 mm and a length of 16 mm to 22 N. Each frame must be inside the cutting type M9 X 1 is for the carbonyl core type SCR-8. If such frames can not be ham manufacture, they can be glued together out of construction paper. A strip of paper should be thick fluff glue and tightly screwed in several layers on a wooden bolvaiku diameter of 9.5 mm. After the glue has dried scaffolds are impregnated with bakelite or spirit varnish. The outer diameter of the former should also be equal to 12 mm. In order that the core could be moved inside the paper frame some distance 3 mm from the edge on opposite sides of the carcass, making two cuts in width to 3 mm. Then, these slots are wound in one series of thick thread, which will serve as a thread. Exterior upper frame part of the paper shown in Fig. 2a.
On the frame length of 22 mm wound coil pairs D, £ 2, and L3, and frames of length 16 mm — coil winding and іv- like «Uiiversal» with two crossings per turn. The size and location of the coils on the frames shown in Fig. 3, and their data are shown in Table. 1.
Transformer coils and intermediate frequency circuit formed on frames, carved plexiglass size, as shown in Fig. 2b Each coil consists of three sections of 65 turns of PEL-1 0.12 wound «viaval.» If the scaffolds manufactured from organic glass can not be possible, they may be of thick paper glued to the same size. Finished coils are as armor-carbonyl cores such as SB-1a, the two halves of which are then glued with BF-2. .
IF transformer together with the capacitors C"and — C] -4 mounted on getinaksovoy or textolite plaike thickness of 2 mm. Dimensions plaiki given ua Fig. 4 holes with a diameter of 13 mm, which sets collected by the coil circuit of intermediate frequency, it is desirable to make the depth of 1 mm. If it fails, making the through-holes, glue the coil should be collected so that the cores do not go beyond the plane of the rear plaiki. Cores are glued to the bar should be the glue BF-2. Intermediate frequency transformer must be enclosed in an aluminum screen with a diameter of 35 mm. To strap * With contours ye could move within the screen, you need to make a few of bokam- slots; and bend the screen inward on. rasstoyaaii. 4 alkali metals from the center of the circle. Screen, and with it ;, strap with loops’ ■ strengthening to the chassis with two screws. The circuit is mounted on getinaksovoy- or textolite plank size of 90 X 35 mm .. without screen: This bar smontirorantsymi With her other, parts installed under the chassis.
If a radio amateur can not make the contour of the coil, then you can take them on the radio, «Moskvich» or radiograms «Ural». In this case, the capacitor must be St. capacity of 430 pF, 68 pF, Sd, and S25- 200 pF. Transformer circuits and an intermediate frequency can be used by the receiver «rhodium-52» or «52-Record». You can of course use any other intermediate frequency transformers, designed for 465 kHz.
Peremennse resistance — TK with a switch that is used to turn on and turn off the receiver.
Loudspeaker applied type 1GD-1 with the voice coil having a coil of wires 61-1 PEL 0.16. The resistance of the voice coil DC is 3.25 ohms. In the absence of such a speaker can be replaced by another, for example type-1GD 1GD 5 or 6. Since the resistance of the voice coils have more, the secondary winding of the output transformer 73 should have the same wire loop. :.
The output transformer is formed on the core plates on the W-16. The plates are assembled butt" with a gap of 0.12 mm tolzdyya set to 16 mm. Winding ia.W -w joke of 2850 and 150 turns of PEL-1, 0.10, and winding II — 60 turns of wire PE’L * 1: 0.64.
Power tratssforiyator Tr2 has a core of plates: type. VIII-19 (package 28 mm thick), collected perekryshku. 1a comprises a winding 838 turns of PEL-1, 0.28, and 16 -gt; — 615 turns of PEL-1 0d21. Obmotka- // consists of 40 turns "wires PEL-1 1.0:; /// — Of 840 turns of PEL-1 0.16.
The receiver is mounted on the U-ua-metal chassis of different sizes 275 X 110 X 50 mm Top chassis mounted unit variable capacitors, intermediate frequency transformer, a dynamic speaker with output transformer, radio and power transformer Tr2. On top of the bracket last getinaksovoy reinforced strap, ua which are mounted diodes DW-TS24 and bypass their resistance.
In the basement of the chassis located electrolytic capacitors C22 and C, volume control and two mounting plaiki. On one of them set the contour of the coil of the frequency converter and the range switch, which is used as a board consisting of four sections at two positions each.
Location details in the basement sha si shown in Fig. 6.
Receiver is enclosed in a plastic box from the radio «Moskvich». Of course, a radio amateur can make a box out of wood, plywood or Plexiglas on your own.
Establishment of the receiver, in the usual way (see. In the magazine «Radio» number 3 and 4 of 1954, article V, King of «Building pergeterodiia»).
Guard against transient overloads
In the summer after the storm in the subscriber transformers and fuses burn out of the line or the whole line for a long time it is out of order. Avoid this at short-term overload is possible, using special fuse. Production of such arrangement is as follows.
A standard fuse removed one by knife tips, in the upper end part of drilled hole diameter of 2 mm, and in the center — 1 mm. On the rod of 2 mm diameter and spiral wound steel wire with a 5-7 mm long tap length of 30 mm. One of the fingers threaded through otveostie in the center part and solder used at the last round. The item should be used freely, but straight out to move inside a glass tube. For details b soldered one end of the fuse g, the other end is threaded through the hole in the second tip and solder. Of insulating material is cut al washer with holes coinciding with the holes in the first tip. From elastic brass plate d cut with a tap e, folded into a cylinder and tightly inserted into a tube. Thereafter, the free end of the helix through the threaded hole in the center of the tip with two openings and a tip is put on and bonded to the tube. On came out of the top opening tip retraction e don conduit, and the removal of bent at a right angle upward. The free end of the helix is adjusted its tension, after which the end of the coil soldered to the tip. Between tap E and other soldered tip «spare» fuse-link, which is located outside of the glass tube.
Poltava region. Kozin
/"To write off the receiver can receive the transmission of two radio stations: 173 kHz (1734 m) n 200 kHz (1500 m); its sensitivity 200-600 uV at a voltage of 3 to headphones resistance 4000 ohms. LF amplifier gain of about 100; frequency bandwidth of 200 to 5000 Hz with a weakening to -6 dB. Distortion in the output voltage of 5 to 8-10 percent. Power is provided by a receiver battery cell flashlight KBSLS 0,5-half anode batteries from the hearing aid GBSA-45 (iakal 1.25 and -0.15, -1.6 anode 20 mA), the power consumption of about 0 2 watts. Reserve power to inflame enough for 2 Zchasa the receiver, anode batteries — 120 hours.
Receiver using three miniature lamps according to the scheme 1-F-2 using the first lamp reflex and using feedback.
The receiver is designed to work with the loop antenna in two types: the «small» frame, fortified directly ua receiver, and «big» frame, which hung over the shoulder tourist.
The input of the receiver circuit is receiving 1X frame and variable capacitor C]. The voltage supplied to the circuit Ua control grid lamp L1 (1P2B) RF amplifier, and amplified via a capacitor Ce enters the regenerative detector is assembled on the tube A2 (1P2B).
Circuit detector consists of inductor L2 and two fixed capacitors C2 and C3 to preset ua first and second programs. Adjustment is made by potentiometer feedback /? 3. Prodetekti-rovainoe and amplified voltage to the load regeneratoracherez divider consisting of the capacitors C4, C5 and the resistance goes back to the grid of the first tube, and working as a low-frequency amplifier. Increased lamp voltage Ax bottom Cop frequency removed from the resistance and enters the grid lamp L3 (1P2B) output low-frequency amplifier. The negative bias on the grid of the tube output stage is removed from the resistance. The resistance prevents the receiver from the lamp burnout in case of contact with their intensity anode voltage. Variable resistance provides damping of excess voltage when installing a new heater element.
Toggle VC to switch fixed frequency receiver, VCG — for power on and off.
At the receiver, the following handmade items: receiving the frame, coil and a potentiometer.
Shallow frame is wound on the carcass of an organic glass with a thickness of 1.5-2 mm and has dimensions shown in Fig. 2. The frame frame 150 turns of wire wound PSHO 0.18.
In order to frame the turns do not shift and do not spoil the conductor insulation, the finished frame is covered from the top organic glass, diluted in dichloromethane.
Large frame has a diameter of 50 cm and consists of 36 turns of wire PESHD 0.5 wrap top insulating tape. Both frames have soft lead end ending iozhkami from lamps.
Inductors and / 3 are respectively 300 and 250 turns of wire PSHO 0.12. Throttle is Dr. 1500-2000 PSHO 0.05-0.07 turns of wire, winding «uni-versal» or «vnaval.» In the latter case, the frame must be reinforced by cheeks of a thin cardboard, between which the winding. Coils £ 2 and / 3 have an inner diameter of 10 mm, a throttle Dr. — 6 mm. Coils arranged on a common frame made of heavy paper, the distance between the coils of 3-5 mm. To adjust the inductance value in the frame is introduced magnetite core. Potentiometer Yag may be made of constant resistance, from which the paint is removed, the slider contact is achieved phosphor broizy.
The receiver is mounted in a small rectangular box, glued Plexiglas thickness of 1.5-2 mm. The dimensions of the box are shown in Fig. 3. In the right at you. After setting up the station checking job feedback, and that adjustment of the receiver end. If the feedback does not work, you should change ends at the coil L3, and then usually the feedback is working properly.
If after the receiver phones monophonic loud audible buzz, this indicates that the receiver generates a low frequency. Get rid of the lasing frequency -Low possible, reducing resistance but in this case the gain of the receiver will drop a few, so it is best to check the installation and the grid circuit spread farther from the anode.
The input circuit of the receiver can be assembled without the variable capacitor. Instead, take a fixed capacitor is connected in parallel with the n it trimmer, with a capacity of 80-100 pF.
of the battery is placed in the left-mounted receiver. The bottom of the box on the outside of a front panel of the receiver, the receiver closes the top two covers. Large lid covers the receiver, it is mounted on hinged antenna «small frame.»
Location and details of their attachment can be clearly seen in Fig. 4, a perspective view of the receiver with an open frame design is shown in Fig. 5, in the rest position the frame is located behind the receiver. The main components are fastened to the housing of the receiver either by means of screws or are glued liquid organic glass bulb can be soldered directly to the specific details, or blocks. On the front wall of the casing of the receiver is superimposed thick paper with the relevant inscriptions that covered the top with a thin organic glass attached to the casing of the receiver with four screws.
Convinced of the correctness of the installation, you can include voltages, connect a large frame and begin to establish the receiver. If done correctly, according to the electrical installation and the greatness of the elements specified ua scheme, the receiver should immediately start working. Setting conducted capacitor C | n magnetite core coil і2- setting should be maintained at 200 kHz after setting ua maximum volume switch the receiver to the frequency of 173 kHz n produce the maximum volume setting on the capacitor C n selection of the value of Ci. Adjust magnetite in this case it is impossible, as it would lead to the first fixed frequency detuning
It is much easier to make priemnnk one fixed frequency, the more that it is enough for a tourist.
At the receiver, except said set of lamps may work well miniature lamp from the hearing aid — and two types 06P2B 1P2B one lamp type, in this case the current on heat reduced to 80 mA. By Dinah scheme was also assembled a receiver at three lamps finger-type series 1K1P. The receiver had a large size, but worked very well.
1. The victory of Soviet athletes
Tgt; IV International " Shortwave competitions organized by the League of Friends of the Polish People’s Republic soldier to mark the day of the Polish Army, attended by more than 500 radio transceivers and receivers sotii stations Bulgaria, Hungary, German Democratic Republic, Poland, Romania, Czechoslovakia and the Soviet Union.
For the first time in such competitions competed in short wave carrying two-way radios as the telephone and telegraph.
And in Warsaw, capital of the Polish People’s Republic, brought together members of the Ground Jury to take stock of the more interesting events.
Among them are representatives from each country — participant of the competition. The Referee — A. Eglnnsky SP1CM (Poland) and his deputies — K. Nesterov LZ2KAC (Bulgaria), T. Matusek SP6XA (Poland), P Vasilescu Y06VG (Romania), N. UAZAF Kazan (USSR), K. Kamnnek OK1SKH ( Czechoslovakia) and Chief Secretary J. Jezierski SP2SJ (Poland). Representatives of Hungary and the German Democratic Republic to a meeting the panel of judges did not arrive.
Refereeing Commission allocated Central Radio League friends soldier, held a large and important work in testing more than 800 reports submitted by the participants of the competition.
The competition was contested as a team and individual championship; Each country fielded a team of operators working for receiving and re giving radio stations, and radio operators observer team,
In the team competition the athletes have achieved well-deserved victory of the Soviet Union. Team radio operators operators took a round of the 6198 Telegraph and telephone points, 3610 points. With 9808 points.
stations showed the best results, and awarded special-League diadems friends soldier — eight Soviet. The first place was the team of radio operators. Kiev. UBKAA1 radio club which consisted of the master radio amateur sport Aprelenko G. and V. Cherevko who scored in both rounds of 1107 points. This is the best result of the competition. Second place was awarded numerous champion DOSAAF on radio — radio operators team Saratov radio club (UAKTSE) having 1084 points, the third — the master radio amateur sport L. Labutin (UAZTSR), gaining 1022 points. .
The fourth place was taken by the operators of Dnipropetrovsk station Radio Club (UBKAD), scored 997 points.
The fifth place with 939 points, has won multiple winner of international competitions hams, team radio operators OKKTAU in Laiskro-yu. The sixth and seventh places were taken by the master radio amateur sport Yuri Chernov (UATSB) and A. Scheinikov (UAFTS). Eighth place was won by the Czechoslovak radio amateur sports master A. Gezutsky (OKAO), who collected 903 points. The staff of the radio station UA6KOD Taganrog Radio Engineering Institute came in ninth place, radio operators UBKBR Kharkiv Polytechnic Institute — on the tenth place.
«In the first ten, the best short-volnbvnkov-iablyudateley contested by individual championship, seven seats occupied Soviet athletes. , The first place went V. Grigoriev — UB55256 (Dnepropetrovsk), the second — the master, amateur radio spoota C. Hazan — UTS5-5014 / UAZ (Moscow), the third — the operator of the Czechoslovak radio reception HC1 -00 407, the fourth, fifth and the sixth — Soviet athletes: V. Koinov -UBb-1.9006. (.Chernigov), V. Myasnikov — UAZ-3807 (Ivanovo) and Yu Ryaskin — UAZ-15042 (Opochki … Veliko Lukskoy area). Seventh place was taken by Polish. receiving station 5R8-001, vosmoe1- V. Dzygarev -UR2-22522 (Thapa ,, ESSR), the ninth — Czechoslovak observer IKP-196 516 and the tenth — P. Lobanov — UAZ-3853 (Ivanovo). ‘The Soviet athletes — participants "^ International Shortwave competition — awarded 28 diplomas League friends soldiers, including eight first degree diplomas.
2. In honor of the Soviet Friendship Month chehoslovatsko
The Ground Jury, comprising representatives of the countries — participants of the competition, at its meeting in Prague, has summed up the last fight.
Team championship is determined by the highest number of points scored ten best operators receiving and transmitting and receiving stations in each country. Personal leadership among competitors is the greater number of points scored by operators of receiving and transmitting and receiving stations.