Next Generation DATV Repeater

    Next generation TV Repeater Development: Available for delivery from June 2013

I am currently working on a future proof repeater solution. I should have the working prototype (output 70—2200MHz) during April and a 3.4GHz prototype in a case during May. This product will be ideal for Analogue repeater keepers who want to convert to Digital. The entire repeater (driver Transmitter, receivers and multiplexers) will be contained within a 1U 19”chassis. Just add your own Rx filters and Power amplifier(s). The output is DVB-S2 (also DVB-S software selectable) or DVB-T 145-2200MHz (1mW) and with an option for 3.4GHz 1mW or 10GHz (1mW or 200mW on 10GHz) with up converter contained within the chassis (1U).
Here are some of the key and more interesting features:

– With DVB-S2 you can switch on the PILOTS and then the re-lock time is under 1 second, it also supports H264, or MPEG2 depending on what is sent by the user!
– You can select QPSK or 8PSK for an even smaller BW for the same bit rate giving the following bandwidth example:
Total 6Mb/s for programme using the following settings:
DVB-S2; 8PSK; 3/5FEC; Pilots=ON; RollOFF=0.25;
(6.95Mb/s with 5MHz spectrum bandwidth)

There are three inputs and two programme outputs, so two people can use the repeater at the same time! Here is an example configuration:

Input 1 (Programme 1) : Has an auto switch, H264 (HDMI) encoder for a sustaining programme feed from a local media player or test card generator, but when RX lock occurs on the receiver then the Transport Stream switches to the Rx so Programme 1 is then in repeater mode.

Input 2 (Programme 2): The second receiver can be connected to the second TS input, or you can specify a second TS switcher, so you can switch between the two DVBS/S2 receivers, perhaps one is 23cm and one has a down converter from 10GHz or between two receive antennas on the same band set to different frequencies. The lock indicator on the Rx causes the TS switch to switch and with priority on one Rx should there be a lock on both inputs, or configure both as a pseudo-diversity receiver driven from two Rx antennas.
This is an example configuration that I am using for the prototype, but all of the above is customisable to your exact requirements! Number of receivers, inputs, outputs etc. Remote control is via the RS-232 interface (modem etc), but I am also experimenting with a web control option.

I can also add an MPEG2 encoder for an external analogue Rx input if required as an alternative or an addition to the H264 encoder.

Example RF Inputs:
DVB-S/S2 23cm, dual receiver, (3Mb/s, 4MHz bandwidth) and output is according to H264 or MPEG2 whatever you send to it.
DVB-T 70cm in, 3Mb/s, 2MHz BW, QAM16; 2/3FEC; 1/4 Guard interval
Drop me a line if you are interested in discussing all the options.

73’s
Justin G8YTZ

Leave a Reply