Berlin 10-metre Relay DBØBLO goes into normal Operation
After extensive testing, the DBØBLO 10-metre relay goes into normal
operation. The initiative and realisation of this relay radio station
comes from DARC local club Berlin-Hohenschönhausen (D20).
The relay transmitter operates on the assigned frequency of 29,640 kHz
and the receiver according to the band plan 100 kHz lower on 29,540 kHz.
The modulation type is narrowband FM (NBFM).
In order to realise the isolation between transmitter and receiver,
remote receiver sites were developed in Lichtenberg and Rummelsburg.
The connection between RX and TX is realised via the Hamnet or the
Internet. A total of three Rasperry Pi control the process with the help
of the SVXLink software. The strongest signal is sent to the
transmitter. The relay is carrier-controlled.
In order to prevent the transmitter from being triggered by short peaks
(e.g. due to OTH radar interference), the carrier must be stationary for
about one second before the relay is opened. A roger beep signals the
carrier drop at the receiver.
A K is sent for Lichtenberg and an R for Rummelsburg.
You can find more information about the location at
(Från IARU Region 1 HF-managers list, tnks DF5JL),