What is, if I mount the combination antenna instead of a easySPLIT OCB (Operates Class B) and a separate GPS?

The combination antenna is easy to mount and works very well.The quality of the reception is very similar to a regular VHF antenna. The difference is the height of the antenna in which the combination antenna is mounted normally. A typical mounting place of the combination antenna is the railing at the stern of the ship. This “mounting” height is much less than the height of the masttop. In our practical use we found out, that the transmission range and the reception range is more or less the half. With our easySPLIT OCB and the masttop antenna you have a typical range of app 8nm for the transmission of your AIS data and app 25nm for the reception of other AIS data (Depends of course of the antenna and cable quality, as well as of the weather!) This is simply due to the reason of the physical effect of the VHF (Distance is line of sight and you know, as higher, as better).

“There is not such a good amplifier existing than a high mounted antenna!”

Why do I need another splitter type to use it with the easyTRX?

You need to use the easySPLIT OCB (OCB=operates class B) because of the following reason.If you use the easySPLIT there are connected the following devices: FM radio, VHF radio and AIS receiver. Only one of these units can phisically also transmit, which is in this case the VHF radio. In the moment when the VHF radio is transmitting, the other connected devices must be disconnected very fast, so that the transmission power from the VHF is only going into the antenna and not into the also connected devices.Lets have a look now at a typical installation of the easyTRX. With the easySPLIT OCB there are following devices connected to the easySPLIT OCB: The FM Radio, the VHF Radio and the easyTRX, which is a Class B transceiver. There are 2 (two) devices connected which can transmit. This means also, that the two connection pathes of the CHF radio and the easyTRX must be monitored simultaneously. If one of the “transmitter” is transmitting, the other devices must be disconnected for this period of time. This is the difference.

With a standard AIS receiver it is sufficent to montior one connected “transmitter” power entry pathes, with a Class B transceiver, like the easyTRX two connected “transmitter” power entry pathes.

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