Why did CATV standarize in 75 ohms and everyone else in 50? The 2019 Stack Overflow Developer Survey Results Are In Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 11:00UTC (8:00pm US/Eastern)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?
The 2019 Stack Overflow Developer Survey Results Are In
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 11:00UTC (8:00pm US/Eastern)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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$begingroup$
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.
impedance cables telecommunications coaxial
asked Mar 30 at 17:43
hjfhjf
4972823
$endgroup$
|
show 1 more comment
$begingroup$
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.
impedance cables telecommunications coaxial
asked Mar 30 at 17:43
hjfhjf
4972823
$endgroup$
$begingroup$
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
|
show 1 more comment
$begingroup$
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.
impedance cables telecommunications coaxial
asked Mar 30 at 17:43
hjfhjf
4972823
$endgroup$
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
impedance cables telecommunications coaxial
asked Mar 30 at 17:43
hjfhjf
4972823
asked Mar 30 at 17:43
hjfhjf
4972823
asked Mar 30 at 17:43
hjfhjf
4972823
asked Mar 30 at 17:43
hjfhjf
4972823
asked Mar 30 at 17:43
hjfhjf
4972823
4972823
$begingroup$
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
|
show 1 more comment
$begingroup$
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
|
show 1 more comment
1 Answer
1
active
oldest
votes
$begingroup$
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.
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
$endgroup$
$begingroup$
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
add a comment |
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1 Answer
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$begingroup$
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.
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
$endgroup$
$begingroup$
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
add a comment |
$begingroup$
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.
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
$endgroup$
$begingroup$
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
add a comment |
$begingroup$
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.
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
$endgroup$
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.
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
answered Mar 30 at 17:55
Dave Tweed♦Dave Tweed
124k10153268
124k10153268
$begingroup$
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
add a comment |
$begingroup$
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
add a comment |
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$begingroup$
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