HF Diversity reception ?
 

Henry Kolesnik wrote:
"What were some other names for the device that RCA called a tone
decoder?"

CTCSS is often called PL tone (for Private Line, a trademark of Motorola
to describe their implementation of Continuous Tone Coded Squelch
System).

Best regards, Richaard Harrison, KB5WZI

HF Diversity reception ?
 

Richard Harrison wrote:
Henry Kolesnik wrote:
"What were some other names for the device that RCA called a tone
decoder?"

CTCSS is often called PL tone (for Private Line, a trademark of Motorola
to describe their implementation of Continuous Tone Coded Squelch
System).

Best regards, Richaard Harrison, KB5WZI

Continuous Tone Coded Subaudible Squelch

HF Diversity reception ?
 

Hey Guys
I made an error when I called the RCA device that selects the best Rx a
Tone Decoder, it's called a Tone Keyer. It selects the strongest of 3
HF Rx signals and amplifies it. What did the other HF diversity makers
call Tone Keyer.
I know about CTCSS but its unrelated to my query.
Thanks
Hank

Hank
"Dave" wrote in message
...
Richard Harrison wrote:
Henry Kolesnik wrote:
"What were some other names for the device that RCA called a tone
decoder?"

CTCSS is often called PL tone (for Private Line, a trademark of
Motorola
to describe their implementation of Continuous Tone Coded Squelch
System).

Best regards, Richaard Harrison, KB5WZI

Continuous Tone Coded Subaudible Squelch

HF Diversity reception ?
 

Henry Kolesnik wrote:
Hey Guys
I made an error when I called the RCA device that selects the best Rx a
Tone Decoder, it's called a Tone Keyer. It selects the strongest of 3
HF Rx signals and amplifies it. What did the other HF diversity makers
call Tone Keyer.
I know about CTCSS but its unrelated to my query.
Thanks
Hank

Hank
"Dave" wrote in message
...
Richard Harrison wrote:
Henry Kolesnik wrote:
"What were some other names for the device that RCA called a tone
decoder?"

CTCSS is often called PL tone (for Private Line, a trademark of Motorola
to describe their implementation of Continuous Tone Coded Squelch
System).

Best regards, Richaard Harrison, KB5WZI

Continuous Tone Coded Subaudible Squelch

I had a "Westinghouse" dual version of the Racal RA-117 with 2 RF
chains. There was a "voter" of some kind that went with it, but I did
not have that part.

HF Diversity reception ?
 

Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

HF Diversity reception ?
 

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI


I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".

HF Diversity reception ?
 

Dave wrote:
Motorola called it "Private Line".

Thanks Dave, I was trying to remember "PL tones".
--
73, Cecil http://www.w5dxp.com

HF Diversity reception ?
 

On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI


I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".

Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

HF Diversity reception ?
 

JosephKK wrote:
On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".

Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

No decoding involved. It's a tone that unsquelches an FM radio.

HF Diversity reception ?
 

On Thu, 27 Nov 2008 12:57:42 +0000, Dave wrote:

JosephKK wrote:
On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".

Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

No decoding involved. It's a tone that unsquelches an FM radio.

Which make and model / series? There are dozens of variations.

HF Diversity reception ?
 

JosephKK wrote:
On Thu, 27 Nov 2008 12:57:42 +0000, Dave wrote:

JosephKK wrote:
On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".
Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

No decoding involved. It's a tone that unsquelches an FM radio.

Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS

HF Diversity reception ?
 

On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:
On Thu, 27 Nov 2008 12:57:42 +0000, Dave wrote:

JosephKK wrote:
On Sun, 16 Nov 2008 19:20:11 +0000, Dave wrote:

Richard Harrison wrote:
Dave wrote:
"Continuous Tone Coded Subaudible Squelch"

I like that better than "Continuous Tone Coded Squelch System" as
"System" is nondescriptive.

Best regards, Richard Harrison, KB5WZI

I think it's from the MOCOM 70 Service Manual. Motorola called it
"Private Line".
Since it appears that you do not want a telephone DTMF decoder what is
it that you want to decode?

No decoding involved. It's a tone that unsquelches an FM radio.

Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS

Have you read your own references?

Bottom line, most any tunable tone decoder.

HF Diversity reception ?
 

JosephKK wrote:
On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:

Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS

Have you read your own references?

Bottom line, most any tunable tone decoder.

If a vibrating reed can be considered a "decoder" then you are correct.

However, there are not "dozens of variations".

HF Diversity reception ?
 

On Mon, 01 Dec 2008 14:13:23 +0000, Dave wrote:

JosephKK wrote:
On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:

Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS

Have you read your own references?

Bottom line, most any tunable tone decoder.

If a vibrating reed can be considered a "decoder" then you are correct.

However, there are not "dozens of variations".

Sure can. Collins Radio used mechanical resonators in an HF radio ISB
diversity 2240 baud modems. Then they used a switched capacitor meta
resonator. Then they used DDS synchronous comparison. And of course
there are various narrow band filter methods. And of course whatever
internal method the 8870 DTMF decoder uses. Who knows what methods
can be implemented in fast UC or small DSP or even an FPGA, except it
will not be a mechanical resonator. I suppose a mathematical model of
a mechanical resonator though.

HF Diversity reception ?
 

JosephKK wrote:
On Mon, 01 Dec 2008 14:13:23 +0000, Dave wrote:

JosephKK wrote:
On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:
Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS
Have you read your own references?

Bottom line, most any tunable tone decoder.

If a vibrating reed can be considered a "decoder" then you are correct.

However, there are not "dozens of variations".

Sure can. Collins Radio used mechanical resonators in an HF radio ISB
diversity 2240 baud modems. Then they used a switched capacitor meta
resonator. Then they used DDS synchronous comparison. And of course
there are various narrow band filter methods. And of course whatever
internal method the 8870 DTMF decoder uses. Who knows what methods
can be implemented in fast UC or small DSP or even an FPGA, except it
will not be a mechanical resonator. I suppose a mathematical model of
a mechanical resonator though.

Damn, you overthink things. The subject is PL, as generally used in
2-way mobile and hand-held radios and base stations. There are a few
variations, as a handful of tones have been added to the original group.

The receiver looks for a tone in the audio of an incoming signal. If
that tone is heard, that part of the squelch system unmutes the audio.

I have no idea how you got from that to Collins HF Modems, but I'm sure
it was a lovely trip for someone.

HF Diversity reception ?
 

On Tue, 02 Dec 2008 13:58:37 +0000, Dave wrote:

JosephKK wrote:
On Mon, 01 Dec 2008 14:13:23 +0000, Dave wrote:

JosephKK wrote:
On Sun, 30 Nov 2008 22:52:16 +0000, Dave wrote:

JosephKK wrote:
Which make and model / series? There are dozens of variations.

These are the standard CTCSS freqs:

http://www.batnet.com/~mfwright/ht220plcodes.html

http://en.wikipedia.org/wiki/CTCSS
Have you read your own references?

Bottom line, most any tunable tone decoder.

If a vibrating reed can be considered a "decoder" then you are correct.

However, there are not "dozens of variations".

Sure can. Collins Radio used mechanical resonators in an HF radio ISB
diversity 2240 baud modems. Then they used a switched capacitor meta
resonator. Then they used DDS synchronous comparison. And of course
there are various narrow band filter methods. And of course whatever
internal method the 8870 DTMF decoder uses. Who knows what methods
can be implemented in fast UC or small DSP or even an FPGA, except it
will not be a mechanical resonator. I suppose a mathematical model of
a mechanical resonator though.

Damn, you overthink things. The subject is PL, as generally used in
2-way mobile and hand-held radios and base stations. There are a few
variations, as a handful of tones have been added to the original group.

The receiver looks for a tone in the audio of an incoming signal. If
that tone is heard, that part of the squelch system unmutes the audio.

I have no idea how you got from that to Collins HF Modems, but I'm sure
it was a lovely trip for someone.

You wanted a tone detector. Then you asked if a vibrating reed
(mechanical resonator) can be one. Then you said that there was not
many methods, so i named some that even did more complex things. You
asked for the discussion and received it.
Moreover, the tone squelch system does some other complex things as
well. Particularly when multiple users (groups) are on a single
channel in a single locale.

HF Diversity reception ?
 

On Sat, 13 Dec 2008 10:25:16 -0800, JosephKK wrote:


You wanted a tone detector. Then you asked if a vibrating reed
(mechanical resonator) can be one. Then you said that there was not
many methods, so i named some that even did more complex things. You
asked for the discussion and received it. Moreover, the tone squelch
system does some other complex things as well. Particularly when
multiple users (groups) are on a single channel in a single locale.

I've administered business band radio systems. CTCSS is similar to a 3
tumbler keylock.

HF Diversity reception ?
 

"Dave" wrote in message
m...
On Sat, 13 Dec 2008 10:25:16 -0800, JosephKK wrote:


You wanted a tone detector. Then you asked if a vibrating reed
(mechanical resonator) can be one. Then you said that there was not
many methods, so i named some that even did more complex things. You
asked for the discussion and received it. Moreover, the tone squelch
system does some other complex things as well. Particularly when
multiple users (groups) are on a single channel in a single locale.

I've administered business band radio systems. CTCSS is similar to a 3
tumbler keylock.


more like a single tumbler combination lock.