Satellite TV Cable Induced signal. One cable, 2 channels

This topic has 3 replies, 3 voices, and was last updated 1 August 2020 at 18:17 by Martin Kyte.

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1 August 2020 at 15:10 #488653
Speedy Builder5
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@speedybuilder5
I have been having signal problems, Dish to Humax . We live in a "Fringe" area for the signal and after 15 years, the cables – Dish to receiver have started to 'perish'. Anyway, I replaced one of the cables some time ago and it was time to replace the other as the signal received on the oldest cable was 'weak'. So I removed the cable from the LNB and left it dangling whilst I threaded a new cable. However, before connecting the new cable, I saw that the same strength signal came from the Humax channel connected to the old cable (But no connection to the LNB). The cables run in cable ducting about 8 metres long.

Any ideas as to how that works ?
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1 August 2020 at 15:10 #32118
Speedy Builder5
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@speedybuilder5
1 August 2020 at 16:53 #488675
SillyOldDuffer
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@sillyoldduffer
A satellite cable has to be terminated with a 50ohm resistive load at both ends before the signal is contained inside the screen. In this case both cables are open ended allowing the LNB to use one as a transmit antenna while the Humax sees the other as a receive antenna. Neither accidental antenna has to be efficient because they're close together in the conduit. The signal should disappear if a 50 ohm resistor is put across the open end of either cable.

Dave
1 August 2020 at 18:17 #488693
Martin Kyte
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@martinkyte99762
Well 75 ohms actually.

regards Martin
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Satellite TV Cable Induced signal. One cable, 2 channels

Satellite TV Cable Induced signal. One cable, 2 channels

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