PL tone removal?Baofeng not finding CTCSS toneWhy does P25 occasionally break through tone squelch on my analog HTs?
Mimic lecturing on blackboard, facing audience
Strong empirical falsification of quantum mechanics based on vacuum energy density?
Does IPv6 have similar concept of network mask?
Does the Catholic Church consider Constantine's vision of "by this symbol conquer" to be from God?
PTIJ: Haman's bad computer
What are some good ways to treat frozen vegetables such that they behave like fresh vegetables when stir frying them?
Solve the following system of equations - (3)
Probability that THHT occurs in a sequence of 10 coin tosses
Is this toilet slogan correct usage of the English language?
What are the balance implications behind making invisible things auto-hide?
What is the English pronunciation of "pain au chocolat"?
Plot of a tornado-shaped surface
Did arcade monitors have same pixel aspect ratio as TV sets?
Has any country ever had 2 former presidents in jail simultaneously?
Why does the Sun have different day lengths, but not the gas giants?
Does an advisor owe his/her student anything? Will an advisor keep a PhD student only out of pity?
What if a revenant (monster) gains fire resistance?
How can mimic phobia be cured?
Does the UK parliament need to pass secondary legislation to accept the Article 50 extension
15% tax on $7.5k earnings. Is that right?
What is Cash Advance APR?
Are Captain Marvel's powers affected by Thanos' actions in Infinity War
How to create table with 2D function values?
Is there a way to get `mathscr' with lower case letters in pdfLaTeX?
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 Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
$endgroup$
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 Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
$endgroup$
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 Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
$endgroup$
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 Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
asked Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
asked Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
asked Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
asked Mar 12 at 14:40
hotpaw2hotpaw2
3,20821833
3,20821833
add a comment |
add a comment |
1 Answer
1
active
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 Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
);
);
, "mathjax-editing");
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "520"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fham.stackexchange.com%2fquestions%2f13019%2fpl-tone-removal%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
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 Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
$endgroup$
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 Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
$endgroup$
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 Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
$endgroup$
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 Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
answered Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
answered Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
answered Mar 12 at 16:47
Walter Underwood K6WRUWalter Underwood K6WRU
1,695712
1,695712
add a comment |
add a comment |
Thanks for contributing an answer to Amateur Radio Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fham.stackexchange.com%2fquestions%2f13019%2fpl-tone-removal%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
-tone-squelch
