27 Apr 2015

R9F-1/SWL Amateur radio blog : circuit board manufacturing

R9F-1/SWL Amateur radio blog : circuit board manufacturing: How can I make the  circuit board  in the  home , care  amateur radio  operators around the world. This page of my blog summarizes all...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : my receivers

R9F-1/SWL Amateur radio blog : my receivers: I have two receivers that work in conjunction with a computer on which the software is installed. With these receivers I spend monitori...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : matching device

R9F-1/SWL Amateur radio blog : matching device: Often amateurs use antenna input impedance is equal to the characteristic impedance of the feeder, and in turn, the output impedance of ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : amateur radio HF and VHF antennas

R9F-1/SWL Amateur radio blog : amateur radio HF and VHF antennas: An antenna is a device for transmitting electromagnetic energy from the supply line into the free space and vice versa. Any antenna has ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : amateur radio circuits

R9F-1/SWL Amateur radio blog : amateur radio circuits: Scheme of active antenna for HF bands from the German magazine



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : decibels and Neper

R9F-1/SWL Amateur radio blog : decibels and Neper: Neper - dimensionless logarithmic unit ratio of two values ​​- the natural logarithm of the dimensionless ratio of a physical quan...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : balun

R9F-1/SWL Amateur radio blog : balun: For balancing and harmonizing Ham antennas can be used aperiodic ferrite baluns. These devices can operate in the Amateur Radio HF and ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : matching device-1

R9F-1/SWL Amateur radio blog : matching device-1: To match the output stage of the transmitter  antenna  to the power line, you can use proprietary matching devices for example mfj. But ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : modernized antenna

R9F-1/SWL Amateur radio blog : modernized antenna: It is commonly assumed that the length of the  antenna  to be resonant at the connection to the antenna feed line should be only reacti...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : circuit active antenna

R9F-1/SWL Amateur radio blog : circuit active antenna: This small active antenna published in the German magazine Funkamateur, 1999, № 7 is designed for receivers operating in the range from ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : vk2aou

R9F-1/SWL Amateur radio blog : vk2aou: To square antenna worked in several bands, it can be set in the resonance circuit. Thus square antenna will operate in three frequency r...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : antenna h

R9F-1/SWL Amateur radio blog : antenna h: It is known that a single dipole antenna tuned neslishkom has a high gain. But if you use two of these antennas connected a phased powe...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : UW4HW

R9F-1/SWL Amateur radio blog : UW4HW: Among the amateurs common vertical antenna. They can operate only in one band. To extend the range of frequencies to use so-called &quo...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : T2FD

R9F-1/SWL Amateur radio blog : T2FD: T2fd wire antenna is a dipole. The antenna is tilted at an angle of 30 degrees to the ground or is in the form inverted v, (inverter V)...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Another double square antenna is designed with an ...

R9F-1/SWL Amateur radio blog : Another double square antenna is designed with an ...: The advantage of this antenna: 1. The compact dimensions. 2. The lack of horizontal mounting elements that can contribute to the dist...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : antenna delta

R9F-1/SWL Amateur radio blog : antenna delta: A two-piece wire antenna delta shown in the figure requires a minimum amount of material is very durable and compact. The upper corner...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Double square

R9F-1/SWL Amateur radio blog : Double square: The antenna can be reduced by applying a square coil. Antenna size square for a range of 14 MHz to the coils will be less than the ful...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Dipole antenna gain can be enhanced by the creatio...

R9F-1/SWL Amateur radio blog : Dipole antenna gain can be enhanced by the creatio...: When using a dual dipole antenna radiation resistance is increased which leads to an increase in its efficiency. This dual dipole can...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Loop antenna

R9F-1/SWL Amateur radio blog : Loop antenna: For the behavior of long-distance connections on the low bands are required full-sized antenna. But to set the LF antenna need a very ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Wire antenna V-3

R9F-1/SWL Amateur radio blog : Wire antenna V-3: Reinforcement wire antenna "v" can be increased by increasing the length of her shoulders at the same time changing the ope...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : L-type wire antenna

R9F-1/SWL Amateur radio blog : L-type wire antenna: Conventional wire antenna type "long beam" usually seen as a compromise solution, the code is not possible to install antenna...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : GP antenna for the five ranges

R9F-1/SWL Amateur radio blog : GP antenna for the five ranges: Conventional antenna GP can do whatever she was working on five bands. This requires a tube 8.6 meters long and a diameter of 25 mm. ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : antenna UB5CA and UB5UG

R9F-1/SWL Amateur radio blog : antenna UB5CA and UB5UG: The physical dimensions of the antenna can be reduced by the square. To do this, in terms of maximum anti-phase voltage capacitor conn...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : wire antenna delta W2EGH

R9F-1/SWL Amateur radio blog : wire antenna delta W2EGH: For making QSOs on the low bands, you can use the wire antenna delta + inverted V (W2EGH). This dual antenna. One part of this delta. ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Circuit top boxes for receiver

R9F-1/SWL Amateur radio blog : Circuit top boxes for receiver: In one of the Soviet amateur magazines I found the input circuit of the receiver circuit. This journal was released in 1991 but still...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Wire antenna V-2

R9F-1/SWL Amateur radio blog : Wire antenna V-2: Wire "antenna V", an antenna whose shoulders are angled 90 degrees and has a length L / 2. "Antenna V" for the leng...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Wire antenna V

R9F-1/SWL Amateur radio blog : Wire antenna V: Wire "antenna V" can be done so that it runs in several bands with the switching pattern. The figure below shows the "ae...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : frame antenna

R9F-1/SWL Amateur radio blog : frame antenna: In previous articles looked at ways of shortening the wire antenna box. There is another way to shorten this antenna. The illustration s...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Wire antenna pyramid

R9F-1/SWL Amateur radio blog : Wire antenna pyramid: Among the simple wire antennas can be identified very simple but very effective antenna (I think so). This is called a wire antenna pyr...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Antenna 144 - 146

R9F-1/SWL Amateur radio blog : Antenna 144 - 146: The antenna in the figure is for the radio amateur band 144 - 146 MHz. Despite the fact that the antenna has five elements, it is not l...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Antenna 430 MHz

R9F-1/SWL Amateur radio blog : Antenna 430 MHz: Antenna 430 MHz shown in the figure does not require any configuration, can not withstand the exact dimensions, because it is a broadba...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Indoor antenna

R9F-1/SWL Amateur radio blog : Indoor antenna: To receive a radio antenna is needed. In the medium wave and long-wave station performs this function nominal ferrite antenna. On the ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : unbalanced dipole

R9F-1/SWL Amateur radio blog : unbalanced dipole: The simplest form of the wire antenna is a classic half-wave dipole. Properly executed and set up a wire dipole antenna efficiency is h...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : antenna for HF bands

R9F-1/SWL Amateur radio blog : antenna for HF bands: Very simple antenna for HF bands shown in the figure, it is made in the form of three pigtails each of them is equal to a quarter wavel...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : description of the wire antenna g5rv

R9F-1/SWL Amateur radio blog : description of the wire antenna g5rv: Amateur G5RV wire antenna in the picture with a size of 31 meters, it is the transition between the antenna option with long arms and ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : simple slot antenna for a range of 28 MHz

R9F-1/SWL Amateur radio blog : simple slot antenna for a range of 28 MHz: In the book, ham Strelkova (UA6LAM) "Effective amateur radio antenna" for the 1992 prom described "simple slot antenna&q...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : two cell antenna delta for 40 meters

R9F-1/SWL Amateur radio blog : two cell antenna delta for 40 meters: The first figure shows a conventional antenna Delta with dimensions for a range of 40 meters. The size of the delta can be calculated ...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : vertical antenna for the 144-146 MHz

R9F-1/SWL Amateur radio blog : vertical antenna for the 144-146 MHz: As is known usual vertical dipole is omnidirectional in a vertical plane. A simple antenna with omni-directional (vertical dipole) , fo...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : vhf antenna 5 * 5

R9F-1/SWL Amateur radio blog : vhf antenna 5 * 5: To increase the gain of the antenna needs to increase its size. Maximum gain depends on its construction . But if there is no possibil...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Upgraded wire antenna type inverter

R9F-1/SWL Amateur radio blog : Upgraded wire antenna type inverter: Not always, amateur radio is the ability to set effective long wire  antenna  for the 3.5 and 7 MHz . If you want to install a wire ant...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Wire antenna type cubic

R9F-1/SWL Amateur radio blog : Wire antenna type cubic: In the American Journal of QST for 1973 hobbyist WA1MKR Max Blumer was proposed antenna, which is a wire loop with a perimeter equal to...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : GP antenna for four bands

R9F-1/SWL Amateur radio blog : GP antenna for four bands: The figure shows the antenna GP for four bands : 28 MHz , 14 MHz , 21 MHz and 7 MHz . The main antenna - mast has a height of 9.95 mete...



Circuits and description of the work of amateur radio antennas for HF and VHF bands

R9F-1/SWL Amateur radio blog : Antenna I1ARZ "Magnetic Loop" for the low-frequenc...

R9F-1/SWL Amateur radio blog : Antenna I1ARZ "Magnetic Loop" for the low-frequenc...: At first he intended to build a loop antenna circular shape (Figure 1) with a perimeter of about 10.5 m, which is a quarter wavelengt...



Circuits and description of the work of amateur radio antennas for HF and VHF bands