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Ursec Radio Spectrum Control RF Ammeter


The URSEC Unit Communications Regulatory Services is making strides in the control of the radio spectrum, so as today I had a chance to see the installation and testing of the 16 remote monitoring stations to be located in the city of Treinta y Tres as anger doing in other cities of the country.
These remote monitoring stations are receivers all ICOM PCR2500 maraca mode with coverage from 10 kHz. to 3.3 Ghz interconnected to the Internet, which, at all times is monitoring the radio spectrum in any city of Uruguay.
even had a chance to hear stations in the range of 40 meters. via the remote receiver located in Maldonado.
No doubt is a big step in controlling the national radio spectrum.

■i-catcher Console – Web Monitor

There Handbook not mention it in his chapter on antennas and transmission lines.
in the past was one of the most coveted by the lack of ham and this was common to use a light bulb flashlight like those used in order to control the loading of the radiating system.


Few amateurs who use it today, either because there are a lot of analog instruments y digitales que nos dan las mas variadas informaciones como potencia en watts, impedancia y reactancia de la antena, la ROE y muchos datos mas, así es como este tipo de medidor prácticamente ha desaparecido del uso habitual de los radioaficionados para seguir siendo usado casi en exclusividad por las emisoras de Broadcasting en Onda Media.

La mayoría de los instrumentos que hay hoy en el mercado están diseñados para ser usados en el interior de la estación o intercalados en la línea coaxial de 50 Ω .caso vatimetros de rf, analizadores de antena y otros.
En cambio el Amperímetro de RF o "RF Ammeter " donde el Weston 425 era el modelo mas buscado, es el instrumento que podemos usar dentro del cuarto de radio and outside of the case a remote ATU can be fitted in its own 50-Ω coaxial line as in any other place that has a different impedance to that as opposed to a power meter can only give accurate measurements when working on a line whose impedance is 50 Ω. Your use


More and more amateurs who are interested in experimenting in the LF bands where this kind of instrument to measure stresses the power radiated by the antenna.
The higher the current flowing through the line, the greater the power delivered to the load

measurement of rf power is then a check in the
adjustment procedure that indicates when achieves the highest power output.

antennas used for line open as is the case of the famous G5RV is useful to measure the balance in each branch of the line, as the currents will take the same values.
Ideally have two equal units one for each branch of the line, but if you find an rf ammeter today it is difficult two is almost impossible, so that will be more feasible ammeter switching on a branch or other to make comparative measurements.

The scope of the scale depends on the impedance of the line or measuring point with the power to use. Presumably
current can be calculated with the help of Ohm's Law

But Figure 1 as an example an ammeter scaled depth of 2.5 Amper as the photo is ideal for working with power up to 300 watts lines of 50 ohms or the maximum legal power 1Kw on a line of 600 ohms, which would have an indication of 1.29 Amper in such condition.



The RF ammeter in no case will give us an indication of the reflected power, although
for that is the rf power meter, the important thing is to rescue the past this magnificent instrument is one more tool to available amateur radio experimenter present. Types

RF Ammeter

models of the past based their operation in a thermal sensor dome Figure 1


These were so unique range to increase the current capacity that they were able to measure, had to resort to the use of shunts made adequate copper, a technique similar to that used with DC ammeters unlike the material used for the shunt.
But today the sensor element is a coil on a core appropriate toroidal power and frequency ranges to work, the latter is more economical and practical, as well as other benefits such as lower parasitic capacitance.

Such toroids coils allows higher pressure ranges can practically build a unit that covers the range from 1 to 30 MHz with high precision. Another advantage is that you can place a key with appropriate resistive dividers so as to form a unit with multiple measurement ranges to thereby adapt to a range of impedances and broader powers.

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