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SearchResults 1 - 10 of 154 FaqsHow do I disable the automatic line powering circuitry on my Kompact amplifiers?
The easiest way to disable the automatic powering in the Kompact amplifiers is by removing the three resistors. You can locate them in the diagram below, on the left-hand side, surrounded by the red and blue squares. This circuitry is used in each of the inputs of the amplifier. In the following pictures you can find their real location on the PC board as well as how the PCB looks like with and without these three resistors:
I have the unit ref. 5878. I wish to convert the unit to receive an input signal of 735.25 MHz and provide this signal out at 46.25 MHz. Please advise as to the positions of the internal switches. These converters feature three internal filters:
These filters are adjusted according to the needed output/input channel conversion. The internal dipswitches only allow you to select the right frequency for the channel converter local oscillator. In other words, you need to change the position of the switches and you also need to adjust the filters. These operations require specialised equipment such as network analysers. In any case, the reference that you mention will not be able to carry out the conversion from UHF to VHF, because it is a UHF to UHF converter. You must use ref. 5879 which is a UHF to BI converter. How the MAIN UNIT (ref.5715) works:
How the MAIN UNIT (ref.5715) works:
I have ref. 5079: why doesn´t the symbol rate work from 2-45 mBaud? There are some frequencies which have a symbol rate that is below 10 mBaud. The QPSK/PAL ref. 5079 officially works from 10-30 mBaud. Since rates below 10 mBaud could cause problems in some networks around the world, here at Televes we wanted to make sure that the unit worked properly everywhere. Because of this, the technical specifications of this device state that the unit works from 10 to 30 mBaud. However, as some networks can still work below this rate, the unit can be programmed (by the universal programmer ref. 7234) to a minimum of 5 mBaud Therefore, the unit really works from 5-30 mBaud. Below these figures we cannot guarantee that it will work correctly. What is the bending radius of a coaxial cable?
How can a TR165 coaxial cable be used with a saddle and clamp connecting device? A TR165 coaxial cable can be used in this way by employing an adapter lead as indicated below:
Splitband amplifiers have a maximum output level that is similar to broadband amplifiers, so: What are their advantages?
-->Splitband amplifiers feature two separate amplification stages (as their name indicates). Each one is tuned for the UHF and the VHF bands. Because of this, when applying a reduction of the maximum output level, the UHF and VHF channels have to be considered independently as if they were two broadband amplifiers. Therefore, for a particular number of VHF and UHF channels, we can achieve higher output levels using splitband amplification rather than using broadband amplifiers. In a domestic analogue and digital satellite TV reception system:
What should I do? There are digital receivers that are continuously sending a 22 KHz tone to the LNB. This way, the LNB is always receiving the high band of the satellite. To disable this tone, you must:
In a satellite TV installation, most of the satellite channels are not received correctly except those that I know are received with a high power level. The LNBs have to be installed with a certain skew to obtain the correct polarity discrimination. Usually, when a dish is orientated towards a satellite positioned to the east, its cable comes out from the left-hand side (when looking at the dish from the front) When the dish is oriented towards a satellite positioned to the west, its cable comes out from the right-hand side. The internal sensors of the new LNB, ref. 7475, are inverted. Because of this, to receive satellites positioned to the east, the cable comes out slightly sloped to the right. As well as this, it is always necessary to carry out a polarity discrimination adjustment, using a Field Strength Meter. |
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