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Pages: 1

Signal boosters to solve cable attenuation issues

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Tog
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Oct 26th, 2020 at 11:01am  
I have a Tooway set-up provided by skyDSL in France, with an RM5111 modem. Although the connection is usable, it's not up to video streaming and that's an important part of my requirement. The best signal strength I've managed to obtain is an Rx SNR of just over 13.00 dB. However, my real issue is that I have a cable attenuation of about 17.00 dB, which seems very high. I installed my dish on a post some distance from the house because it was too ugly to put on the house facade and the pitch of the roof is E-W. As a result I have a cable run of something over 25m from the dish to the modem. I'm using RG6 coax, so I don't think the cable itself is an issue. Looking online, it would seem that a bidrectional autogain signal booster might fix the problem, but I'm having trouble finding a suitable product for my set-up. A Sonora LA281R-T24 amplifier seems right for the job, but is only available in the US, not Europe. Does anyone have any suggestions for products I might be able to obtain in Europe?
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HipolitoGonzalez
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Reply #1 - Nov 20th, 2021 at 10:26pm  
I think maybe is better to you a better coax wire, like LMR400, LMR600- 800..... are expensive but is better than installing a "electronic" tool, in the middle, reading waves and creating again the wire.... never it works well..

Quote:
I have a Tooway set-up provided by skyDSL in France, with an R1M5111 modem. Although the connection is usable, it's not up to video streaming and that's an important part of my requirement. The best signal strength I've managed to obtain is an Rx SNR of just over 13.00 dB. However, my real issue is that I have a cable attenuation of about 17.00 dB, which seems very high. I installed my dish on a post some distance from the house because it was too ugly to put on the house facade and the pitch of the roof is E-W. As a result I have a cable run of something over 25m from the dish to the modem. I'm using RG6 coax, so I don't think the cable itself is an issue. Looking online, it would seem that a bidrectional autogain signal booster might fix the problem, but I'm having trouble finding a suitable product for my set-up. A Sonora LA281R-T24 amplifier seems right for the job, but is only available in the US, not Europe. Does anyone have any suggestions for products I might be able to obtain in Europe?

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Admin1
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Reply #2 - Dec 9th, 2021 at 12:05pm  
According to the "Tooway Ka v4.6-EN.pdf" document
The max attenuation should be 9.17 dB at 1000 MHz and 14.3dB at 2000 MHz.
Giving cable lengths:
RG59 30m
RG6  50m
RG11 100m

If you have high attenuation, not explicable by cable length, then poor connections or excessive attenuation due corrosion caused by moisture should be suspected.  The end centre pins can corrode and almost disappear, the internal braid of the cable may deteriorate over several metres from the outdoor end in just a few weeks.

The idea of inserting an in-line amplifier is risky. The cable carries a significant DC supply to the TRIA (approx 30V). The signals are 300-800 MHz Rx and 1800-2300 MHz Tx. In addition there may be  reference pilots (e.g. 10 MHz ?) and signalling telemetry data both ways.  In-line amplifiers intended for home TV receive systems may not be able to satisfactority carry all these signals (in both directions). When the TRIA transmits a burst the supply current increases and to avoid significant voltage drop the inner conductor must be copper. Cheap copper plated steel is no use! Commscope RG6 cable is recommended.

If re-making the F type connectors take great care that the outer sheaths connect properly and that the centre pin is bright, rounded at the tip and the correct length. The pin should slide into the socket hole and not simply touch and be pushed back up the cable. Waterproofing is essential.
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« Last Edit: Dec 10th, 2021 at 4:44pm by Admin1 »  
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