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Satellite TV Cable Induced signal. One cable, 2 channels

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Speedy Builder5	01/08/2020 15:10:00
2878 forum posts 248 photos	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 ?
SillyOldDuffer	01/08/2020 16:53:46
10668 forum posts 2415 photos	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
Martin Kyte	01/08/2020 18:17:34
3445 forum posts 62 photos	Well 75 ohms actually. regards Martin

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