My easyDVBT is not receiving TV signals well, what could be the reason?

The unit itself probably works well, but there are 3 different outside influences which could spoil the results from your easyDVBT:A) Cable quality and length The DVBT frequencies are received by a regular VHF antenna, but not in a sufficient quality to watch TV. What our unit is doing is to amplify the signal strength so that the digital receiver box can interpret the signals. But amplification only works, if there is a base level of signals at our easyDVBT. If the cable which is used or the transitions between the cable and the inside of the cabin is no good quality, we do not get any “amplifiable level of signal” into the easyDVBT. Proposal for a solution: Use of a good quality cable e.g. RG 213 or ecoflex 10. Attenuation of RG213 or Ecoflex 10 at 1000 MHz is around -2dB/10m which is an acceptable value. RG58 is very bad for TV frequencies: Attenuation of RG58 at 1000 MHz is -6,4dB/10m which is an enormous attenuation. Another important factor of the quality is the connector: The TV high frequencies lose signal strength if the transition into the cockpit is soldered too easy and not “by plugs and sockets”. You easy loose -3 to -4 dB if only soldered not in a very exact coaxial way.

B) Self oscillating of the amplifier In a very seldom, but possible case, the amplifier starts self oscillating in consequence of a critical impedance of the existing cable and the VHF antenna, which is very bad. To find a remedy, you can extend the cable by 1-2 meters. If this does not help, please ask us for a little electronic system which eliminates the oscillating, material No. B041.

C) Polarization of the TV transmitter from the TV stations VHF antennas are made to receive vertical polarized HF waves very good. This transmission of DVBT is the norm, for that reason everything should work fine. But we found out that some TV transmitters in the Baltic Sea stilldo work with horizontal polarization (as in the former years) and then the polarization might course technical difficulties. If you want to receive per horizontal polarized TV transmitter, please notice our self-developed “horizontal wave catcher” unit for the regular bar antenna (except of fibre glass antenna).


Category: FAQ: easyDVBT

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