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Faqs

The units refs. 7310, 7311, 7328 do not keep the memorised channel in the assigned channel. Because of this, I now receive noise or another channel where there should be a memorised channel.
Respuesta


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-->The reason for this is that the channel was memorised with the AFC on (Automatic Frequency Control).

The solution consists in reprogramming the channel with the AFC disabled.

Once it is reprogrammed, switch the AFC back on again.

The enabling and disabling of the AFC is carried out in the installation menu.

The receiver ref. 7243 produces a flickering effect on the screen menu and in the tuned channel.

However, the channel frequency is correct, as the best tuning point has been searched for.

Respuesta

Domestic receivers that feature video switching (*) generate picture flickering when the signal received is near the quality threshold (c/n ratio).

The solution is to:

Improve the c/n ratio by checking the installation:

  • Antenna size
  • LNB skew
  • Cable length
  • Loss in distribution elements,...etc.

(*) Those that display a coloured background instead of grain when there is no signal

In a domestic satellite TV installation , there is some distortion on the TV screen.

Using the tuner that is incorporated in the field strength meter, it is possible to verify the reception of the satellite channel.

Why is there this picture distortion?

Respuesta

The receiver incorporates an active stage in the terrestrial antenna input.

If the signal level of the terrestrial channel is too high, the saturation at this stage causes this problem.

You can check this by verifying the picture quality when you unplug the terrestrial antenna cable.

The solution is in the attenuation of these signals.

Can I use the receiver reference 7235 for free-to-air channels for NTSC satellite transmissions?

Respuesta
  1. The domestic receiver RSD 7235 is able to detect the video format of the digital input signal: PAL or NTSC.
  2. It generates the video in the same format to be used through the SCART connector.
  3. However, this is only possible if you select in the menu "receiver options": TV format ; Auto.
  1. What is the RF output power at 2.4 GHz (in milliwatt) for the TX 888R?
  2. What is the input sensitivity of the RX 999R?
  3. What are the precise frequencies of the 4 channels the system uses.
Respuesta
  1. 94 dBμV = 31.6 W = 0.0316 mW (over 75 ohms)
  2. -85 dBm =23.7 dBμV = 3.2 pW=0.0000032 mW
  3. 2421 MHz, 2449 MHz, 2477 MHz and again 2421 MHz.

So we use only three frequencies and repeat the first for the 4th channel.

Is it possible to use a mobile antenna as a base station?
Respuesta

The main difference between base station antennas and mobile ones is the ground plane implementation.

The ground plane of a mobile antenna is configured by the metallic structure of the car where it is installed.

When this kind of antenna is used as a base station antenna, the ground plane has to be substituted with a similar element.

By doing so, their VSWR adjustment improves and the radiation pattern of the antenna will keep its shape.

How do UHF-VHF dual band antennas work?
Respuesta

A dual band antenna is designed to be tuned to more than one frequency submultiple.

For example, the antenna ref. 6541:

  • This is an antenna l/2 for the VHF band
  • and l/4 for the UHF band.

I just bought a satellite receiver type RSD 7255.

It is working perfectly, and I get both Astra and Hotbird.

However I bought an Astra receiver because as I am of Dutch origin, I wanted to receive all the Dutch programs: Netherlands 1, 2 and 3, as well as RTL4, and eventually some more.

But these programs are scrambled!

I emailed Astra, and they tell me that I have to buy a Dutch receiver with a smartcard.

But:

How can I put a Dutch smartcard into your receiver?

Do you have any other suggestions as to how I could receive these Dutch programs?

Respuesta

Televes sells two different types of digital receivers.
The one you have bought, RSD 7255, will let you to receive free-to-air digital satellite television only.

If you want to watch Pay-TV you need a digital satellite receiver with Common Interface, for example ref.7254.

To be able to receive Pay-TV channels you will need a CI (Common Interface) module and a smartcard from the service provider of your choice (the service provider is the distributor of the channels).

CI modules and smartcards are licensed to service providers.

If you are subscribing to services from more than one service provider, you might have to change between different smartcards, or even different CI modules.

If you do not insert a CI module, you only will watch free-to-air TV channels.

The CI module is inserted into the slot behind the lid in the front panel of the receiver.
The smartcard must be inserted into the slot of the CI module.

Diferencias entre una Antena Activa y una Antena Boss Tech
Respuesta

EL EXPERTO OPINA

Las tradicionales antenas electrónicas no dejan de ser simples antenas activas, es decir, una antena más un amplificador que en no pocos casos presenta una figura de ruido inaceptable.
Las antenas Televés dotadas de Boss-Tech no son antenas activas. El dispositivo inteligente que incorpora, y que se activa o no en función de las necesidades de la instalación, autorregula su ganancia para llevar hacia el televisor la mejor calidad de señal posible.
Las antenas activas pueden causar problemas que las hacen inservibles en el escenario actual de la TDT y en el futuro de la LTE/4G. Mientras que una antena activa se saturará al ecibir señal LTE/4G, el dispositivo Boss-Tech regulará la ganancia para evitar

  

la saturación, como ya se ha podido medir en diversas pruebas de radiación conjunta de señales de TDT y 4G en canales adyacentes sobre antenas Boss-Tech. Incluso la opción de desactivar su alimentación asegurará la integridad de la señal en casos extremos.
El sistema Boss-Tech permite al instalador y al usuario final despreocuparse del nivel de señal en recepción, resolviendo los problemas ocasionados por el ajuste de nivel o por las variaciones de señal que se den en la vida de la instalación.
Por lo tanto, instalar una antena Televés con Boss-Tech garantiza la continuidad en la calidad de servicio y el correcto funcionamiento de la instalación, también con LTE/4G

 

 

How can one of the headend channels be suppressed in one downlead, but still remain in the other downlead?
Respuesta

Through the use of an adjacent channel combiner ref. 5254.

This element permits a current DC bypass between its inputs, but still maintains a high isolation for the radio frequency

To further suppress the channel in the corresponding downlead, the notch filter ref. 4162/72 can be used.

This device cannot only eliminate one channel, it can also eliminate any channel or channels that are connected to the inputs of the adjacent channel combiner.

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