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PL tone removal?
Baofeng not finding CTCSS toneWhy does P25 occasionally break through tone squelch on my analog HTs?
$begingroup$
How are PL tones (CTSS, et.al.) typically removed from the audio of received VHF FM repeater signals?
Is it done with a fixed high-pass filter? Or a notch, when using a transceiver with the PL tone configured correctly? Or dynamically, by assuming any constant low tone detected is hum to be removed by an auto-adaptive notch?
Or is it sometimes not removed by filtering because the tiny speakers on handheld receivers don't have sufficient low frequency response?
tone-squelch
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
$endgroup$
add a comment |
$begingroup$
How are PL tones (CTSS, et.al.) typically removed from the audio of received VHF FM repeater signals?
Is it done with a fixed high-pass filter? Or a notch, when using a transceiver with the PL tone configured correctly? Or dynamically, by assuming any constant low tone detected is hum to be removed by an auto-adaptive notch?
Or is it sometimes not removed by filtering because the tiny speakers on handheld receivers don't have sufficient low frequency response?
tone-squelch
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
$endgroup$
add a comment |
$begingroup$
How are PL tones (CTSS, et.al.) typically removed from the audio of received VHF FM repeater signals?
Is it done with a fixed high-pass filter? Or a notch, when using a transceiver with the PL tone configured correctly? Or dynamically, by assuming any constant low tone detected is hum to be removed by an auto-adaptive notch?
Or is it sometimes not removed by filtering because the tiny speakers on handheld receivers don't have sufficient low frequency response?
tone-squelch
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
$endgroup$
How are PL tones (CTSS, et.al.) typically removed from the audio of received VHF FM repeater signals?
Is it done with a fixed high-pass filter? Or a notch, when using a transceiver with the PL tone configured correctly? Or dynamically, by assuming any constant low tone detected is hum to be removed by an auto-adaptive notch?
Or is it sometimes not removed by filtering because the tiny speakers on handheld receivers don't have sufficient low frequency response?
tone-squelch
tone-squelch
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
asked 4 hours ago
hotpaw2hotpaw2
3,16321733
3,16321733
add a comment |
add a comment |
1 Answer
1
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oldest
votes
$begingroup$
I would expect some low-frequency roll-off in the amp and the speaker. You could check by putting headphones on the speaker output.
Wikipedia says that a 300 Hz cutoff high-pass filter is common.
https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Also, the CTSS tone is injected at a lower level than the voice content, usually 15% of full deviation. That is about 8 dB below full modulation.
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
$endgroup$
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
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$begingroup$
I would expect some low-frequency roll-off in the amp and the speaker. You could check by putting headphones on the speaker output.
Wikipedia says that a 300 Hz cutoff high-pass filter is common.
https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Also, the CTSS tone is injected at a lower level than the voice content, usually 15% of full deviation. That is about 8 dB below full modulation.
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
$endgroup$
add a comment |
$begingroup$
I would expect some low-frequency roll-off in the amp and the speaker. You could check by putting headphones on the speaker output.
Wikipedia says that a 300 Hz cutoff high-pass filter is common.
https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Also, the CTSS tone is injected at a lower level than the voice content, usually 15% of full deviation. That is about 8 dB below full modulation.
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
$endgroup$
add a comment |
$begingroup$
I would expect some low-frequency roll-off in the amp and the speaker. You could check by putting headphones on the speaker output.
Wikipedia says that a 300 Hz cutoff high-pass filter is common.
https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Also, the CTSS tone is injected at a lower level than the voice content, usually 15% of full deviation. That is about 8 dB below full modulation.
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
$endgroup$
I would expect some low-frequency roll-off in the amp and the speaker. You could check by putting headphones on the speaker output.
Wikipedia says that a 300 Hz cutoff high-pass filter is common.
https://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System
Also, the CTSS tone is injected at a lower level than the voice content, usually 15% of full deviation. That is about 8 dB below full modulation.
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
answered 2 hours ago
Walter Underwood K6WRUWalter Underwood K6WRU
1,665712
1,665712
add a comment |
add a comment |
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