Al Klein wrote:
It's not the program. Most radios have a high-pass filter in the
audio so that you don't hear the CTCSS tone.

No, most radios have a three-inch speaker that can't reproduce the
CTCSS tone. If you plug a hi-fi speaker into most radios, you'll hear
the CTCSS just fine.

--
The state religion of the USA is atheism, as established by the courts.

clifto wrote:

Al Klein wrote:
It's not the program. Most radios have a high-pass filter in the
audio so that you don't hear the CTCSS tone.

No, most radios have a three-inch speaker that can't reproduce the
CTCSS tone. If you plug a hi-fi speaker into most radios, you'll hear
the CTCSS just fine.

No, don't think so. The CTCSS tones are 'sub-audible', that is, they are below
the range that humans can hear.

dxAce
Michigan
USA



--
The state religion of the USA is atheism, as established by the courts.

dx'tard wrote:



No, don't think so. The CTCSS tones are 'sub-audible', that is, they are below
the range that humans can hear.

You are wrong. Not to say you are a lying.

This is a list of commonly used PL/CTCSS tones
(all in Hz):

67.0 69.3 71.9 74.4 77.0

79.7 82.5 85.4 88.5 91.5

94.8 97.4 100.0 103.5 107.2

110.9 114.8 118.8 123.0 127.3

131.8 136.5 141.3 146.2 151.4

156.7 162.2 167.9 173.8 179.9

186.2 192.8 203.5 206.5 210.7

218.1 225.7 229.1 233.6 241.8

250.3 254.1

You will see that they are very audible on a decent system. The only
reason they are not audible on systems using this tones -and some others
too- is, that they are using a high pass filter cutting all freqs below
300Hz or so.

Volker Tonn wrote:

dx'tard wrote:


No, don't think so. The CTCSS tones are 'sub-audible', that is, they are below
the range that humans can hear.

You are wrong. Not to say you are a lying.

This is a list of commonly used PL/CTCSS tones
(all in Hz):

67.0 69.3 71.9 74.4 77.0

79.7 82.5 85.4 88.5 91.5

94.8 97.4 100.0 103.5 107.2

110.9 114.8 118.8 123.0 127.3

131.8 136.5 141.3 146.2 151.4

156.7 162.2 167.9 173.8 179.9

186.2 192.8 203.5 206.5 210.7

218.1 225.7 229.1 233.6 241.8

250.3 254.1

You will see that they are very audible on a decent system. The only
reason they are not audible on systems using this tones -and some others
too- is, that they are using a high pass filter cutting all freqs below
300Hz or so.

That is correct. So... plugging the radio into a better speaker will therefore not
help... unless the high pass filter is disabled.

dxAce
Michigan
USA

dx'tard wrote:

That is correct. So... plugging the radio into a better speaker will therefore not
help... unless the high pass filter is disabled.

Most VHF/UHF receivers are not having a highpass filter going so high
(300Hz) but only to about 55 Hz in Europe or 65 Hz in US because of the
mains freqs. It's only the transceivers wich are using these tones
having the freqs up to 300Hz blocked to the AF-stage.
It's simple enough to tap the discriminator output on the RX-section of
nearly any (T)RX.
I have a handheld scanner provinding the CTCSS-tones just out of the
headphone jack. The built-in speaker is too tiny to go below 150Hz.
BTW the higher tones above 150Hz are not used very often.

Volker Tonn wrote:

dx'tard wrote:

That is correct. So... plugging the radio into a better speaker will therefore not
help... unless the high pass filter is disabled.

Most VHF/UHF receivers are not having a highpass filter going so high
(300Hz) but only to about 55 Hz in Europe or 65 Hz in US because of the
mains freqs. It's only the transceivers wich are using these tones
having the freqs up to 300Hz blocked to the AF-stage.
It's simple enough to tap the discriminator output on the RX-section of
nearly any (T)RX.
I have a handheld scanner provinding the CTCSS-tones just out of the
headphone jack. The built-in speaker is too tiny to go below 150Hz.
BTW the higher tones above 150Hz are not used very often.

Thanks Deutsche'tard.

dx'tard schrieb:



Thanks Deutsche'tard.

My pleasure.

hugs and kisses

AWWWW little steavie doesn't like being called a tard?

dxAce wrote:

Volker Tonn wrote:


dx'tard wrote:


That is correct. So... plugging the radio into a better speaker will therefore not
help... unless the high pass filter is disabled.

Most VHF/UHF receivers are not having a highpass filter going so high
(300Hz) but only to about 55 Hz in Europe or 65 Hz in US because of the
mains freqs. It's only the transceivers wich are using these tones
having the freqs up to 300Hz blocked to the AF-stage.
It's simple enough to tap the discriminator output on the RX-section of
nearly any (T)RX.
I have a handheld scanner provinding the CTCSS-tones just out of the
headphone jack. The built-in speaker is too tiny to go below 150Hz.
BTW the higher tones above 150Hz are not used very often.


Thanks Deutsche'tard.

In article ,
says...


clifto wrote:

Al Klein wrote:
It's not the program. Most radios have a high-pass filter in the
audio so that you don't hear the CTCSS tone.

No, most radios have a three-inch speaker that can't reproduce the
CTCSS tone. If you plug a hi-fi speaker into most radios, you'll hear
the CTCSS just fine.

No, don't think so. The CTCSS tones are 'sub-audible', that is, they are below
the range that humans can hear.

dxAce
Michigan
USA



--
The state religion of the USA is atheism, as established by the courts.


No, just on most radios, the low end is cut off by
filters and the crappy speaker. The tone on the Ohio
Turnpike troopers on 155.790 and 155.685 is one af about
a half dozen that can be easily heard around the Toledo
area. It's the "whine" in the background...

If you can't hear from 50-200hz, you have serious
problems...

BDK

BDK wrote:

In article ,
says...


clifto wrote:

Al Klein wrote:
It's not the program. Most radios have a high-pass filter in the
audio so that you don't hear the CTCSS tone.

No, most radios have a three-inch speaker that can't reproduce the
CTCSS tone. If you plug a hi-fi speaker into most radios, you'll hear
the CTCSS just fine.

No, don't think so. The CTCSS tones are 'sub-audible', that is, they are below
the range that humans can hear.

dxAce
Michigan
USA



--
The state religion of the USA is atheism, as established by the courts.


No, just on most radios, the low end is cut off by
filters and the crappy speaker. The tone on the Ohio
Turnpike troopers on 155.790 and 155.685 is one af about
a half dozen that can be easily heard around the Toledo
area. It's the "whine" in the background...

If you can't hear from 50-200hz, you have serious
problems...

No problem here, my ears are quite good. My point was that with most radios, whether
one uses a good speaker system or not, the tones won't be heard.

That being due to the high pass filter. If you are hearing them, then perhaps your
system is not really up to par, or there are other issues with the transmitting
system which you have no control over.

dxAce
Michigan
USA