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Faqs

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:

  • Place an F male connector (either the clamping or twist-on type; ref. 9346 and ref. 9349 respectively) at the end of the TR165 coaxial cable
  • Then connect an F female - F female adapter ref. 4173.
  • Cut a piece of T100 coaxial cable and place an F male connector ref. 4171 at one of its ends.
  • Finally connect the 4171 to the female-female adapter on the TR165 and the other end to the saddle and clamp connection.

Splitband amplifiers have a maximum output level that is similar to broadband amplifiers, so:

What are their advantages?


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-->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.

What is the bending radius of a coaxial cable?

EXPERT OPINION

All coaxial cable have a limit in their bendingradius at a given value; beyond thisvalue the cable no longer will maintain its electrical properties.
Furthermore, apart from the variation of impedance, an excessive bending beyond the minimum bend radius can lead to break of shielding foil. This breakage leaves the coaxial cable exposed to the ingress of interfering signals.
For cable runs where it might be forced to bending radius less 

 

 

than its minimum value, the use of right angled connectors is the best solution. The image below shows how a connector easyF preserves the integrity of the cable compared with a straight F connector.
There is no specific rules to establish the minimum bending radius.

 

Manufacturers and operators establish their own criteria. In practice and as a general rule, it is not recommended bending radius less than five times the cable diameter, as shown in the figure 

Javier Esteban  
Technical Asssitance Manager

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.

In a domestic analogue and digital satellite TV reception system:

The bypass connector of the digital receiver is used to send the LNB signal to the analogue receiver.

However, I do not receive most of the analogue channels.

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.
This is the band that is reserved for digital transmissions.

To disable this tone, you must:

  • Switch the digital receiver off
  • The LNB is now ready for the analogue receiver.

I have a SAT92 installation and I think its power supply unit could be damaged.

What are the voltages and what is their location in the connector?


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-->Rear view:

I have refs. 5054 and 5078 installed but I can see horizontal lines moving vertically across the TV screen.

What should I do?

The effect of the horizontal lines moving vertically up or down the TV screen could be because you have installed a T05 headend unit without taking into account that the mounting must have the same grounding reference point.

To avoid this, you must install the equipment:

  • By either fixing the modules to the wall mounting rail (ref. 5071)
  • or by screwing the modules down to the subrack (5301, 8250/5306)

Can the CDC control module (Headend Management System) be connected to a LAN and be controlled from it?

The Headend Management System software does not have the protocol to be able to work within a LAN network. So the answer is no.

How can I arrange the channel amplifiers units in the headend to combine adjacent channels?

 

VHF channels:

UHF channels:

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