Practices with field measurer
We have the manual in DRIVE
One of the measuring instruments more used to obtain a good measurement of the parameters of the signal, as it can be the entrance tension, is the field measurer.
First of the values that can interest to us is the intensity of the signal, that it is possible to be visualized in the measurer of field in the unit of dBµV (dB micro volts).
The antenistas of antennas for TDT and satellite use them when one fine adjustment of in the direction of the antennas is necessary. In many cases, when the signal arrives strong (near the repeater) or to have plates of great diameter, this instrument usually is left alongside, but situations of great demand of signal (collective antennas) or zones with small electromagnetic fields (zones of low cover), the use of this equipment is fundamental.
The measurer that occupies to us (prolink 3 or 4) is developed under the concept OSD (On Screen Display), by which, by means of a system of numbered bellboys whose functions are described in the monitor with sample of different parameters, next to a rotating pulser-selector by means of which it is possible to sail by configuration menus (they also appear in screen)
The rank of frequencies that covers is between the 5 to 862 MHz for the TV and FM and another band from 900 to 2150 MHz for satellite.
It accepts the systems of television (the PAL, SECAM and NTSC) next to the signals of TV digital, able to decode and to measure the parameters of
- The power measurement
- The carrying relation to noise (C/N)
- Error rate of the DS (To see)
- Relation of modulation error (MER).
- Also it allows to analyze the Transport Stream MPEG-2/DVB and to identify the noncorrectable packages (Wrong Packets) received.
The equipment counts on a microprocessor that is in charge to automate most of the processes to show the data before mentioned, in addition to others as the correction of the measurement, the continuous synthesis of frequency, automatic selection of the attenuators or the disconnection of the equipment when it does not have activity (battery saving).
If we are in the option of Analyzer of Phantoms, the measurer allows the visualization of all the present signals in the band, allowing in addition other operations as the measures to level of analog channels, the measurement of relation C/N referred to a noise frequency that is user defined and the measurement of the power of digital channels by integration.
We can show the phantom from full span (all the band) or limited 8 terrestrial MHz in (for the terrestrial one) or the 32 MHz (of the TV satellite).
Account with a system of storage of configurations (99 memories) to keep the configurations from measurement that us can be useful (name from the configuration, tension of feeding of the LNB, selected frequency, system of TV, type of measurement, etc.
The tensions that can command to feed the outer units (amplifying of mast) are 13 V, 15 V, 18 V and 24 V. For the 13 LNB we have V, 13 V + 22 kHz, 18 V, 18 V + 22 kHz, 15 V, 15 V + 22 kHz.
With interface RS-232C it is possible to be connected with a computer for the collection of data, to control the equipment remotely or to connect a printer for the turned over one of the measures.
Commandos of promax prolink 4
In the measurer we have the following bellboys, who give rise to the following functions
- Key of home.
- Key OSD. We can see the measurement information that appears in
the monitor in the way TV (measured of level).
- Menus of RESISTANCE, gain control and BRIGHTNESS
- Rotating selector and pulser. Within this selector, when beating some of the options available is selected. When turning it, we do not move by the menu. We will see it more ahead
- EXT VIDEO. It is illuminated if by the euroconector enters a video signal
- DRAIN. It is illuminated if the measurer is feeding an external unit
- CHARGER. It indicates that the battery is being loaded
- BATTERY. It is illuminated in red if the load is inferior to 50%, in amber if it is superior to green 50% and if the load is complete.
- MAIN KEYBOARD 12 keys for selection of functions and entrance of numeric data.
- 0. We happen of A/D
- 1 ESPECTRO/TV. We happen of TV to Analyzer of Phantoms, and vice versa.
- 2 MEASUREMENT Selection of type of measurement, that depends on the band, the standard, the options including and of the operation way.
- 3 WAY TV. Once in way monitor, it shows the information.
- 4 SEARCH. It carries out a tracking from of the channel or present frequency until it finds an emission. We can select the threshold search from 30 and 99 dBµV.
- 5 GUARDAR/RECUPERAR. It allows to store a measurement or to recover it.
- 6 SOUND
- 7 FEEDING OF THE OUTER UNITS. As it were shelp before, it allows to provide different tensions of feeding from the external unit (LNB, amplifier. )
- 8 and 9 KEY OF DIRECT ACCESS. Key of assignable direct access to any function of any menu.
-  SYNTONY BY CHANNEL OR FREQUENCY We changed from syntony between channel or frequency.
-  SELECTION FREQUENCY MANUAL. It allows to directly tune the frequency by means of the keyboard. when finishing, pressing revolving key.
Within the revolving button, we have the following functions
In the way TV Within this way we have the following functions
Change of Authorized area to happen of terrestrial band (5-862 MHz) to band
satellite (900-2150 MHz)
System and Standard We entered the color system (the PAL, SECAM or NTSC)
and different standards from TV (B/G, D/K, I, L, M, N or Digitalis).
Batera and Lnb Tension of feeding of the outer units
Canalizations show a table of channels
Banda Canal width Defines the bandwidth of the channel. Very important and necessary to measure digital channels next to the parameter C/N
Active Telex telex.
DiSEqC (for satellite). Protocol of DiSEqC commandos who are sent to the peripheral one. To see image where is a Diseqc to select 4 lnb that is installed in a plate of parabolic
Noise of Reference (When it is in way C/N Noise of Reference). We can define the frequency to take the sample from the noise level. Arrived at this point, we must beat in Following acceding to the second submenu:
Acquisition Data We can store up to 9801 measures of automatic form
Entrance of Video Allows to control the signals of commutation of the Euroconector.
Configuration C/N Seleccionamos the way dpara to measure relation C/N in
Car or Noise of Reference.
Channel of the Nicam (Only for the analog channels). We choose the channel of
sound NICAM that goes towards the loudspeaker.
Threshold search (Only for the analog channels). in the automatic search of transmitters, it defines the level threshold.
Osc. The Lnb premises (satellite). In order to define the frequency of the oscillator
the premises of the LNB installed in the parabolic one
Polarity of the Video Selects the video polarity (Little use because of being used in analog channels in the satellite band).
Test FI the Sat (ICT) We are in the same. For analog channels of satellite band. it verifies the distribution networks. To beat Following to accede to
Clock indicates hour and date to Us.
Units We can choose between dBµV, dBmV or dBm
Disconnection Manual We can have equipment in Automatic disconnection or manual
Language Of the several that shows, is good for using ENGLISH from time to time
Sound (ON) and (In Off) of the buzzer
Information Equipment Presents information on the equipment
In the Analyzing way of Phantoms, the first submenu that appears is made up of (we named the new ones)
Span is worth to Us to indicate the bandwidth to show in screen. We can choose between Full (all the band) or other values as 500 MHz, 200 MHz, etc.
Reference level the vertical adjustment we can select a level from 70 to 130 dBµV in 10 jumps of dB.
Double Cursor (Only analog channels, are not worth the trouble to explain it)
Sweeping We changed to the speed of sweeping of the way phantom. It is possible to be chosen by Precise (swept slow but with high accuracy), Fast (on the contrary that the slow one)
and To align Antenna (useful to align antennas).
Banda Canal width (Only for digital channels). It defines
bandwidth of the channel (to see the function Cursor).
Canalizations Select the table of channels activates.
To print Prints the phantom
We will begin to see how it works with a pair of videos of a colleague Granano.
We follow with 2 video
We finish with a third video
0 Practical Tutored. We will see as visualizing a channel that lowers with a Fi of 1877 Mhz fed with a 13 LNB of V + 22 KhZ. Steps.
Important. To date of 07/03/2018, this transponder seems to have changed. To prove with the data of 22 feeding LNB 18 + Khz and the FI of 1548 MHz. I do not modify the statement so that one considers that the satellite companies can make changes in their frequencies.
- We ignite the Measurer of field and with the rotating selector, we selected in option of band in Satellite
- In the green button, we selected the feeding of the 22 LNB to 13 + KHz
- In button 0, we must have selected the digital option (when doing it, they will be to three verticallines in him viewfinder)
- Rotating button again. We select Span and we left it in 200 MHz
- In the rotating Button, we selected reference level to 80 dB (to indicate the maximum value of gain in the vertical axis)
- We must make sure that the button of (channel-frequency) corresponding to number 30, is in way frequency.
- In green button, we selected frequency FI of 1877 MHz
- In button 2, we will see that it leaves option DVB. We selected it.
- We visualize the channel when puncturing in TV option
Using the measurer promax 3. to follow the following steps to visualize the channels that come from the transponder of the transmitter that uses channel HSE24, Sonnenklar TV, TV 5, REGAL TV etc. For it, a fast guide can serve to you
- To locate frequency FI. For it we must follow the steps that come in the manual of facilities from parabolic.
- We happen with green button to the change of band (if it is in UHF) to happen to the satellite band
- Once found that frequency, we must add it in the measurer. For it, we beat in the green button, we add the frequency and we beat to enter (pressure of the revolving button)
- Now we must feed the LNB. This we must it know already if we have seen the manual of before. Khz must leave 13 + 22
- To see phantom and TV beating in button 1
- When beating on that button twice it is acceded to see the channel. A little can take to that they are loaded.
- To beat in the revolving button to see the list of channels that there are in that transponder. To write some but of the mentioned ones before.
2 Practical. Using transponder 11973 V, to calculate the FI, and the polarization of the LNB. To enter the data the field measurer and to respond to the following questions, using the functions that us d¡ button 2 of the field measurer and taking the information that offers each section to us of the practice
- What channels we can see
- That signal we have in dB
- To make a measurement of the relation signal-noise
3 Practical. To investigate what digital channel has sixth and the 2. To investigate what channel has in contained Malaga, frequency and channels (TV or radio) that uses the same frequency.
4 Measurement of Seeing (Bit error rate, or Error rate of Bits). In a digital data transmission this parameter as the amount of received bits is defined that has errors between the amount of bits received valid by time unit during a period of given time. Usually it is expressed as 10 high to a negative power. We will see an example:
In a measurement we must See = 10 7. This indicates to us that 1 bit has arrived a bit with error of 10.000.000 of bits received.
The bits with errors slow down the process, because the information must be relayed because of an error.
Factors that affect the value of Seeing
Several of the important factors can be enumerated eg: but that they affect to the increase of Seeing,
- Bad relation signal noise (S/N)
- Appearance of interfering signals
- Diminution of the power radiated by the transmitters
- Reduction of the sensitivity of the receivers (electronic equipment, antennas, waveguide, defocusing of parabolas)
- Later constructions to the home of a radio link, that interpose in the way of the RF beam.
- For frequencies of the order 23 GHz, intense rain can get to even interrupt
5 We happen to make the practice
To realise a measurement in the bands terrestrial and satellite of Seeing according to procedure described in manual of promax separated 18.104.22.168
6 Lost in the Distributors, Splitter, the Distributors, PAU and Derivadores
First it is to comment that distributing and distributing, like in its English denomination * or to splitter, it is to name the same of different form. We are going away to refer distributing them as and have the purpose of distributing the signal between several exits. They have therefore, an entrance and several exits, with an equitable distribution of the signal
The case of the derivador, we have a component that makes a similar function, but in one of them, the exit signal is greater to the rest. One is used in great houses or communities. The rest of the exits (TAP) has lost of signal determined to several values 10dB, 15dB, 20dB, while, that the go out with privileges has very little loss, that is used to feed the plant inferior immediately.
And to finish, a PAU is a distributor with two entrances (IN) and the exits (OUT). At the entrance of the house two coaxial cables with different signals arrive, for example, we have a TDT+ASTRA19, and another one with TDT+HISPASAT30. If a user wants to use a satellite, he connects to the valued entrance the cable that interests to him to have the wished service. Another neighbor can use the other cable with the service of the other satellite astra. Both they are due to connect, although only one is used. The reason to connect it is so that not between interference to the communitarian installation.
Once commented these components, to do one instalaci'on simple that contains a distributor and a derivador, measuring the lost one that brings about the element. To make a table where component used and lost in exits is indicated, next to the frequency used in medici'on. To use another frequency to resist values