For the case of a disconnected power supply, the VHF antenna is always connected to the radio over the easySPLIT.That means you can still use your VHF radio. However, if the easySPLIT is switched off, there is no AIS reception, because the antenna always stays connected with the radio. This is for security.
Your question means the situation like anchoring in a port, coastal shipping without navy shipping etc. where the operation of the AIS receiver is not necessary or is senseless. As in the port, if you want to listen to the weather report on VHF. Your question is also legitimate. The „way/path“ VHF antenna – radio transceiver is security relevant. Because of that the „way/path“ is always connect through, that means you can always listen to the VHF radio and also transmit with the VHF radio, even though the easySplit 2nd G. is not connected with the power supply of the boat or is not switched on.
FAQ: easySPLIT 2nd. Gen. >>>
For protection of the connected hardware the outputs to the AIS-receiver and to the VHF-radio are disconnected when sending with the VHF-voice radio. It will be switched over at a transmission power of about 250mW. But it means only a low restriction, because the voice radio works mostly in stand-by mode on reception.
FAQ: easySPLIT 2nd. Gen. >>>
The FM-output of the easySPLIT has an upper frequency limit of about 108Mhz. 156Mhz are in the cut-off area of the electronic filter connected to the FM output. Therefore it will not work to connect a DSC-receiver to the FM output (car radio). But, of course you can use the DSC controller at the VHF output of the easySPLIT.
FAQ: easyDVBT >>>
Yes, the connection FM <=> antenna is always active even when the device is switched off as this is a basic security feature. This means the VHF radio installation can be used even when the easyDVB-T is switched off.
Let us explain what influences good reception.
- How does the unit work: Normally a VHF antenna do not receive well the UHF frequencies of the television transmitters. But there is still a reception signal, even with the regular VHF antenna. What the easyDVBT does is, that it amplifies the UHF television signal so that the digital receiver can work with the signals. But to do so, it is necessary to get an “even small” UHF signal to the unit, to amplify it there.
- UHF attenuation of cables. The regular used VHF cables are of the type RG58. These cables do have a normal attenuation at the VHF frequencies of app. 140-160Mhz. But at the UHF frequencies for TV, up to 900 MHz the attenuation of these regular cables is very high, which means very poor signal transmission of these frequencies. Just to give you an idea: RG58 at 144MHz for 10 m cable: attenuation app. -1.9 dB RG58 at 900MHz for 10 m cable: attenuation app. -6,5 dB
- Poor transmission power of TV stations In some areas the coverage and the transmission power is not very good. This means that almost no signal is received.
Summary: To recveive a good TV signal out of the easyDVBT you need a good cabling, e.g. RG213 or Aircell 7 or Ecoflex 15 and good cable connections from the cable to the unit. Also the area where you are sailing is important, that there is enough “signal strength” to reveive TV signals.
FAQ: easyDVBT >>>
This effect is not wrong, it is just the logic consequence of the unit.
Reason for that is the following. Imagine, that a VHF would “over the easyDVBT” directly transmit with 20W. The TV or the receiver would immediately be broken. Therefore the easyDVBT unit needs to disconnect all other connected units, (except the VHF Radio) in the moment when the VHF Radio is transmitting.
With reference to the cable we did following:The exsiting cable is already 5m long. We tested the VHF/GPS combination antenna with an additional 10 m long cable. At the end the total cable length was 15 m. The additional cable was a simple RG58 cable. It had a male TNC plug and a female TNC plug as extension plugs between the existing cable and the TRX. The plugs were crimped to the cable. This worked very well. All the satellites in our hemisphere were visible.
Therefore we can guarantee a 100% working for a cable length of 15m with RG 58. But as you know as better the cable is, as better the reception and transmission will work.
FAQ: General >>>
The frequency range of the VHF radio output is limited to 108 MHz, i.e. higher frequencies cannot pass this output. For this reason, the reception of DVB-T is not yet possible.
Information: The reception of wave bands outside the VHF range is not possible with most frequently installed VHF antennas, i.e. in the best case the lower range of the VHF-DVB-T-band may be received. The reception of higher VHF wave bands requires a change to a multi-band antenna. Due to the commonly used coaxial cables (RG58/RG213) and coaxial plug-in systems (PL259/SO239) the transmission and reflection losses in the plug and socket connectors increase at higher frequencies to such extent, that adequate reception of higher frequencies would only be possible with a loss of quality. For this purpose it would be necessary to replace the used plugs and sockets by VHF-suitable versions.
We recommend a minimum distance of 80 cm. (e.g. Simrad recommends 100 cm).Please note: Regardless of the distance of the VHF antennas to one another, the antennas should be mounted as high as possible. The higher you mount the VHF antenna, the better is the transmission.
