Coaxial Signal Distance Records - anyone know?

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tigerbay
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Coaxial Signal Distance Records - anyone know?

Post by tigerbay » 23 Jan 2018, 02:55

I pondered a hypothetical question for fun, what is the longest distance a signal (both analogue and digital) can travel through a coaxial cable (depending on it's design and materials) without being 'boosted' further down the line to a receiver (if this was in a 'cable-only' reception scenario) :)

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Tigersaw
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Re: Coaxial Signal Distance Records - anyone know?

Post by Tigersaw » 23 Jan 2018, 11:34

OK, just for fun, lets say 1000 watts in at one end, and a loss of 3db per 100 metres. Lets say we can detect the signal at -120db, so thats a loss of 180db from input to output. 180/3 *100 is 6km Doesn't sound much does it?

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Re: Coaxial Signal Distance Records - anyone know?

Post by ghost123uk » 23 Jan 2018, 15:19

^^^ Blinkin doesn’t sound much :o :shock:

Interesting question though Image

I know that the electricity companies send coms between power stations down the high voltage distribution cables (or at least they used to, not sure about now) and they must be a fair distance apart.
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Re: Coaxial Signal Distance Records - anyone know?

Post by rogerbeep » 24 Jan 2018, 21:16

It depends on:
- Coax type
- Input power
- Input frequency
TRX:
Icom 706 mk II / Icom 735 - Alinco DR-135DX - President Grant mk II / Jackson mk I - CRT SS9900 / One - Anytone AT300M
QYT KT-8900 - Icom F4SR / 28H - Baofeng UV-5R / 888S

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Uniden UBC 780 XLT - Icom R5 / PCR-100 - RTL2832U/R820T + Ham It Up v1.2 - NESDR SMArt

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tigerbay
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Re: Coaxial Signal Distance Records - anyone know?

Post by tigerbay » 30 Jan 2018, 09:23

ghost123uk wrote:
23 Jan 2018, 15:19
^^^ Blinkin doesn’t sound much :o :shock:

Interesting question though Image

I know that the electricity companies send coms between power stations down the high voltage distribution cables (or at least they used to, not sure about now) and they must be a fair distance apart.
Thanks ghost123uk :D

Also, does the dynamics change with an 'internal loop' set-up? (is this sent by balanced line or by coax?)

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