Unlicensed TV broadcasting power limit (Band I)
I'm curious what is the legal limit for unlicensed TV signals being transmitted on the VHF Band I?
This seems ill defined. The part 15 FM rules I am assuming don't apply here. And I don't think it can be illegal at all power levels because even old VCRs and TV tuners will leak a little RF. So what is the limit?
united-states legal vhf transmitter
asked 3 hours ago
Synaps3Synaps3
1534
add a comment |
I'm curious what is the legal limit for unlicensed TV signals being transmitted on the VHF Band I?
This seems ill defined. The part 15 FM rules I am assuming don't apply here. And I don't think it can be illegal at all power levels because even old VCRs and TV tuners will leak a little RF. So what is the limit?
united-states legal vhf transmitter
asked 3 hours ago
Synaps3Synaps3
1534
add a comment |
I'm curious what is the legal limit for unlicensed TV signals being transmitted on the VHF Band I?
This seems ill defined. The part 15 FM rules I am assuming don't apply here. And I don't think it can be illegal at all power levels because even old VCRs and TV tuners will leak a little RF. So what is the limit?
united-states legal vhf transmitter
asked 3 hours ago
Synaps3Synaps3
1534
I'm curious what is the legal limit for unlicensed TV signals being transmitted on the VHF Band I?
This seems ill defined. The part 15 FM rules I am assuming don't apply here. And I don't think it can be illegal at all power levels because even old VCRs and TV tuners will leak a little RF. So what is the limit?
united-states legal vhf transmitter
united-states legal vhf transmitter
asked 3 hours ago
Synaps3Synaps3
1534
asked 3 hours ago
Synaps3Synaps3
1534
asked 3 hours ago
Synaps3Synaps3
1534
asked 3 hours ago
Synaps3Synaps3
1534
asked 3 hours ago
Synaps3Synaps3
1534
1534
add a comment |
add a comment |
2 Answers
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It's illegal at all power levels. If you "leak a little RF" then there is something in Part 15 that applies (e.g. this section for VCRs and cable boxes) and the device needs to be certified. If you broadcast intentionally then there isn't anything that allows it at all, at any power level.
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
add a comment |
Since you mentioned part 15, I'm guessing you're asking about the rules in the United States. According to Wikipedia, "Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other 'low power auxiliary' stations with an output of 50 mW or less."
If you look at part 15 subpart C in detail, you'll see that the frequencies in the VHF I band (44 - 87.5 MHz) have some specific unlicensed uses, mostly related to audio transmissions (wireless microphones, cordless phones, etc.) Since the question is about TV signals, most of those don't apply. The only exception I can see is §15.235, which doesn't specify a specific application (except for saying that it can't be a cordless phone). However, that section is for a very narrow band: 49.82-49.90 MHz. Since NTSC signals require 6 MHz of bandwidth, that band isn't nearly big enough to accommodate a typical video application.
The bottom line is that you can't use the VHF I band for intentional unlicensed video transmission.
Because the question referenced unintentional leakage, I'll point out that it's covered by different rules. Part 15 subpart B has the specifics.
answered 1 hour ago
mrogmrog
25419
add a comment |
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2 Answers
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2 Answers
2
active
oldest
votes
active
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active
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votes
It's illegal at all power levels. If you "leak a little RF" then there is something in Part 15 that applies (e.g. this section for VCRs and cable boxes) and the device needs to be certified. If you broadcast intentionally then there isn't anything that allows it at all, at any power level.
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
add a comment |
It's illegal at all power levels. If you "leak a little RF" then there is something in Part 15 that applies (e.g. this section for VCRs and cable boxes) and the device needs to be certified. If you broadcast intentionally then there isn't anything that allows it at all, at any power level.
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
add a comment |
It's illegal at all power levels. If you "leak a little RF" then there is something in Part 15 that applies (e.g. this section for VCRs and cable boxes) and the device needs to be certified. If you broadcast intentionally then there isn't anything that allows it at all, at any power level.
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
It's illegal at all power levels. If you "leak a little RF" then there is something in Part 15 that applies (e.g. this section for VCRs and cable boxes) and the device needs to be certified. If you broadcast intentionally then there isn't anything that allows it at all, at any power level.
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
answered 1 hour ago
hobbs - KC2Ghobbs - KC2G
66728
66728
add a comment |
add a comment |
Since you mentioned part 15, I'm guessing you're asking about the rules in the United States. According to Wikipedia, "Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other 'low power auxiliary' stations with an output of 50 mW or less."
If you look at part 15 subpart C in detail, you'll see that the frequencies in the VHF I band (44 - 87.5 MHz) have some specific unlicensed uses, mostly related to audio transmissions (wireless microphones, cordless phones, etc.) Since the question is about TV signals, most of those don't apply. The only exception I can see is §15.235, which doesn't specify a specific application (except for saying that it can't be a cordless phone). However, that section is for a very narrow band: 49.82-49.90 MHz. Since NTSC signals require 6 MHz of bandwidth, that band isn't nearly big enough to accommodate a typical video application.
The bottom line is that you can't use the VHF I band for intentional unlicensed video transmission.
Because the question referenced unintentional leakage, I'll point out that it's covered by different rules. Part 15 subpart B has the specifics.
answered 1 hour ago
mrogmrog
25419
add a comment |
Since you mentioned part 15, I'm guessing you're asking about the rules in the United States. According to Wikipedia, "Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other 'low power auxiliary' stations with an output of 50 mW or less."
If you look at part 15 subpart C in detail, you'll see that the frequencies in the VHF I band (44 - 87.5 MHz) have some specific unlicensed uses, mostly related to audio transmissions (wireless microphones, cordless phones, etc.) Since the question is about TV signals, most of those don't apply. The only exception I can see is §15.235, which doesn't specify a specific application (except for saying that it can't be a cordless phone). However, that section is for a very narrow band: 49.82-49.90 MHz. Since NTSC signals require 6 MHz of bandwidth, that band isn't nearly big enough to accommodate a typical video application.
The bottom line is that you can't use the VHF I band for intentional unlicensed video transmission.
Because the question referenced unintentional leakage, I'll point out that it's covered by different rules. Part 15 subpart B has the specifics.
answered 1 hour ago
mrogmrog
25419
add a comment |
Since you mentioned part 15, I'm guessing you're asking about the rules in the United States. According to Wikipedia, "Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other 'low power auxiliary' stations with an output of 50 mW or less."
If you look at part 15 subpart C in detail, you'll see that the frequencies in the VHF I band (44 - 87.5 MHz) have some specific unlicensed uses, mostly related to audio transmissions (wireless microphones, cordless phones, etc.) Since the question is about TV signals, most of those don't apply. The only exception I can see is §15.235, which doesn't specify a specific application (except for saying that it can't be a cordless phone). However, that section is for a very narrow band: 49.82-49.90 MHz. Since NTSC signals require 6 MHz of bandwidth, that band isn't nearly big enough to accommodate a typical video application.
The bottom line is that you can't use the VHF I band for intentional unlicensed video transmission.
Because the question referenced unintentional leakage, I'll point out that it's covered by different rules. Part 15 subpart B has the specifics.
answered 1 hour ago
mrogmrog
25419
Since you mentioned part 15, I'm guessing you're asking about the rules in the United States. According to Wikipedia, "Unlicensed broadcasts on the TV broadcast bands are prohibited, except for certain medical telemetry devices, wireless microphones, and other 'low power auxiliary' stations with an output of 50 mW or less."
If you look at part 15 subpart C in detail, you'll see that the frequencies in the VHF I band (44 - 87.5 MHz) have some specific unlicensed uses, mostly related to audio transmissions (wireless microphones, cordless phones, etc.) Since the question is about TV signals, most of those don't apply. The only exception I can see is §15.235, which doesn't specify a specific application (except for saying that it can't be a cordless phone). However, that section is for a very narrow band: 49.82-49.90 MHz. Since NTSC signals require 6 MHz of bandwidth, that band isn't nearly big enough to accommodate a typical video application.
The bottom line is that you can't use the VHF I band for intentional unlicensed video transmission.
Because the question referenced unintentional leakage, I'll point out that it's covered by different rules. Part 15 subpart B has the specifics.
answered 1 hour ago
mrogmrog
25419
edited 1 hour ago
answered 1 hour ago
mrogmrog
25419
answered 1 hour ago
mrogmrog
25419
answered 1 hour ago
mrogmrog
25419
25419
add a comment |
add a comment |
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