Why did CATV standarize in 75 ohms and everyone else in 50?How is transmission line impedance selected?Industry standard Cat5e cablingWhy Characteristic Impedance must be 50 ohms?Why Inductor reactance 180 ohms?Why do cables have multiple grounds?Where did Bootstrapping get its name?What does S stand for in 75 S ohms?How did wireless telegraphy reach so far?What frequency did wireless telegraphs operate at?Problem understanding CDMA and W-CDMAStandard 2.54/1.27mm pinheader impedance

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Why did CATV standarize in 75 ohms and everyone else in 50?


How is transmission line impedance selected?Industry standard Cat5e cablingWhy Characteristic Impedance must be 50 ohms?Why Inductor reactance 180 ohms?Why do cables have multiple grounds?Where did Bootstrapping get its name?What does S stand for in 75 S ohms?How did wireless telegraphy reach so far?What frequency did wireless telegraphs operate at?Problem understanding CDMA and W-CDMAStandard 2.54/1.27mm pinheader impedance






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








7












$begingroup$


All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms.



Why was this standard chosen?



I was wondering this because good quality RG6 cable can be obtained everywhere for very little, compared to decent quality 50 ohm cabling.










share|improve this question









$endgroup$











  • $begingroup$
    Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
    $endgroup$
    – glen_geek
    Mar 30 at 17:49







  • 1




    $begingroup$
    I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
    $endgroup$
    – TimWescott
    Mar 30 at 18:11











  • $begingroup$
    @TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
    $endgroup$
    – hjf
    Mar 30 at 18:13






  • 1




    $begingroup$
    It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
    $endgroup$
    – Hot Licks
    Mar 30 at 19:07






  • 2




    $begingroup$
    Possible duplicate of How is transmission line impedance selected?
    $endgroup$
    – Dmitry Grigoryev
    Apr 1 at 11:17

















7












$begingroup$


All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms.



Why was this standard chosen?



I was wondering this because good quality RG6 cable can be obtained everywhere for very little, compared to decent quality 50 ohm cabling.










share|improve this question









$endgroup$











  • $begingroup$
    Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
    $endgroup$
    – glen_geek
    Mar 30 at 17:49







  • 1




    $begingroup$
    I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
    $endgroup$
    – TimWescott
    Mar 30 at 18:11











  • $begingroup$
    @TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
    $endgroup$
    – hjf
    Mar 30 at 18:13






  • 1




    $begingroup$
    It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
    $endgroup$
    – Hot Licks
    Mar 30 at 19:07






  • 2




    $begingroup$
    Possible duplicate of How is transmission line impedance selected?
    $endgroup$
    – Dmitry Grigoryev
    Apr 1 at 11:17













7












7








7


1



$begingroup$


All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms.



Why was this standard chosen?



I was wondering this because good quality RG6 cable can be obtained everywhere for very little, compared to decent quality 50 ohm cabling.










share|improve this question









$endgroup$




All of the CATV industry runs on 75 ohm systems, while most of the rest of the radio world uses 50 ohms.



Why was this standard chosen?



I was wondering this because good quality RG6 cable can be obtained everywhere for very little, compared to decent quality 50 ohm cabling.







impedance cables telecommunications coaxial






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Mar 30 at 17:43









hjfhjf

5022823




5022823











  • $begingroup$
    Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
    $endgroup$
    – glen_geek
    Mar 30 at 17:49







  • 1




    $begingroup$
    I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
    $endgroup$
    – TimWescott
    Mar 30 at 18:11











  • $begingroup$
    @TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
    $endgroup$
    – hjf
    Mar 30 at 18:13






  • 1




    $begingroup$
    It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
    $endgroup$
    – Hot Licks
    Mar 30 at 19:07






  • 2




    $begingroup$
    Possible duplicate of How is transmission line impedance selected?
    $endgroup$
    – Dmitry Grigoryev
    Apr 1 at 11:17
















  • $begingroup$
    Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
    $endgroup$
    – glen_geek
    Mar 30 at 17:49







  • 1




    $begingroup$
    I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
    $endgroup$
    – TimWescott
    Mar 30 at 18:11











  • $begingroup$
    @TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
    $endgroup$
    – hjf
    Mar 30 at 18:13






  • 1




    $begingroup$
    It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
    $endgroup$
    – Hot Licks
    Mar 30 at 19:07






  • 2




    $begingroup$
    Possible duplicate of How is transmission line impedance selected?
    $endgroup$
    – Dmitry Grigoryev
    Apr 1 at 11:17















$begingroup$
Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
$endgroup$
– glen_geek
Mar 30 at 17:49





$begingroup$
Some insight is in Andy's answer:electronics.stackexchange.com/questions/350451/…
$endgroup$
– glen_geek
Mar 30 at 17:49





1




1




$begingroup$
I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
$endgroup$
– TimWescott
Mar 30 at 18:11





$begingroup$
I'm not sure if I should say "a substantial minority" or "enough so that it's known" -- but there are radio amateurs who use 75 ohm transmission line for this reason. If you're going to run an antenna tuner anyway, and if you're going to build your own antennas anyway, then it's not a bad way to get a bit more bang for the buck.
$endgroup$
– TimWescott
Mar 30 at 18:11













$begingroup$
@TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
$endgroup$
– hjf
Mar 30 at 18:13




$begingroup$
@TimWescott specifically, this: qsl.net/g4hbt/dipole.htm antenna specifies a 75 ohm line. I finally understand why.
$endgroup$
– hjf
Mar 30 at 18:13




1




1




$begingroup$
It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
$endgroup$
– Hot Licks
Mar 30 at 19:07




$begingroup$
It was 75 ohms for RF signals before cable TV was a "thing". I've always figured it was the cable manufacturers, so they could force you to buy two spools of cable instead of just one. And the connector manufacturers, so they could sell you two different sizes of connectors.
$endgroup$
– Hot Licks
Mar 30 at 19:07




2




2




$begingroup$
Possible duplicate of How is transmission line impedance selected?
$endgroup$
– Dmitry Grigoryev
Apr 1 at 11:17




$begingroup$
Possible duplicate of How is transmission line impedance selected?
$endgroup$
– Dmitry Grigoryev
Apr 1 at 11:17










1 Answer
1






active

oldest

votes


















6












$begingroup$

How is transmission line impedance selected? explains why transmission line impedance matters.



The CATV industry deals with low-level signals, so it cares ONLY about loss and not at all about power-handling. That's why they chose 75Ω transmission lines.






share|improve this answer









$endgroup$












  • $begingroup$
    Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
    $endgroup$
    – hjf
    Mar 30 at 18:01











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1 Answer
1






active

oldest

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active

oldest

votes






active

oldest

votes









6












$begingroup$

How is transmission line impedance selected? explains why transmission line impedance matters.



The CATV industry deals with low-level signals, so it cares ONLY about loss and not at all about power-handling. That's why they chose 75Ω transmission lines.






share|improve this answer









$endgroup$












  • $begingroup$
    Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
    $endgroup$
    – hjf
    Mar 30 at 18:01















6












$begingroup$

How is transmission line impedance selected? explains why transmission line impedance matters.



The CATV industry deals with low-level signals, so it cares ONLY about loss and not at all about power-handling. That's why they chose 75Ω transmission lines.






share|improve this answer









$endgroup$












  • $begingroup$
    Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
    $endgroup$
    – hjf
    Mar 30 at 18:01













6












6








6





$begingroup$

How is transmission line impedance selected? explains why transmission line impedance matters.



The CATV industry deals with low-level signals, so it cares ONLY about loss and not at all about power-handling. That's why they chose 75Ω transmission lines.






share|improve this answer









$endgroup$



How is transmission line impedance selected? explains why transmission line impedance matters.



The CATV industry deals with low-level signals, so it cares ONLY about loss and not at all about power-handling. That's why they chose 75Ω transmission lines.







share|improve this answer












share|improve this answer



share|improve this answer










answered Mar 30 at 17:55









Dave TweedDave Tweed

126k10155271




126k10155271











  • $begingroup$
    Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
    $endgroup$
    – hjf
    Mar 30 at 18:01
















  • $begingroup$
    Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
    $endgroup$
    – hjf
    Mar 30 at 18:01















$begingroup$
Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
$endgroup$
– hjf
Mar 30 at 18:01




$begingroup$
Awesome! I didn't know that thing about power, and now I also understand why NOAA reception turnstile antennas specify 75 ohms too!
$endgroup$
– hjf
Mar 30 at 18:01

















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