there has to be some other modes that normal scanners wouldn't decode.
any thoughts?

Digital?


wrote in message
ups.com...
there has to be some other modes that normal scanners wouldn't decode.
any thoughts?

On 29 Sep 2005 21:18:12 -0700, said in
rec.radio.scanner:

there has to be some other modes that normal scanners wouldn't decode.
any thoughts?

TV.

BTW, "normal" scanners don't "decode" sideband or CW.

If you want to see other "modes", just look at the modulation
definitions at the FCC. Do you consider "speed radar" to be a mode?
How about radiolocation services?

On Fri, 30 Sep 2005 13:35:23 GMT, "Jim Hackett"
said in rec.radio.scanner:

Digital?

Most of what we call "digital" is NFM or SNFM.

On Fri, 30 Sep 2005 11:29:31 -0400, Al Klein wrote:

On Fri, 30 Sep 2005 13:35:23 GMT, "Jim Hackett"
said in rec.radio.scanner:

Digital?

Most of what we call "digital" is NFM or SNFM.

Actually "Digital" is C4FM.


--
Korbin Dallas
The name was changed to protect the guilty.

wrote:

there has to be some other modes that normal scanners wouldn't decode.
any thoughts?

My winradio, running in the background as I type this, has:
AM/AMN/AMS/LSB/USB/CW/DSB/ISB/FM3/FM6/FMN
then there are all the digital data, and voice modes.

Dave

On Sat, 01 Oct 2005 01:43:09 GMT, Korbin Dallas
said in rec.radio.scanner:

On Fri, 30 Sep 2005 11:29:31 -0400, Al Klein wrote:
On Fri, 30 Sep 2005 13:35:23 GMT, "Jim Hackett"
said in rec.radio.scanner:

Digital?

Most of what we call "digital" is NFM or SNFM.

Actually "Digital" is C4FM.

And the modulation on the carrier is??? AM? PM?? FM??

What bandwidth is it?

There's a difference between the process of putting information on the
carrier and the format that information comes in. The OP was asking
about the physical layer, as specified by "AM/FM ..." etc..

On Fri, 30 Sep 2005 23:45:46 -0400, Al Klein wrote:

On Sat, 01 Oct 2005 01:43:09 GMT, Korbin Dallas
said in rec.radio.scanner:

On Fri, 30 Sep 2005 11:29:31 -0400, Al Klein wrote:
On Fri, 30 Sep 2005 13:35:23 GMT, "Jim Hackett"
said in rec.radio.scanner:

Digital?

Most of what we call "digital" is NFM or SNFM.

Actually "Digital" is C4FM.

And the modulation on the carrier is??? AM? PM?? FM??

What bandwidth is it?

There's a difference between the process of putting information on the
carrier and the format that information comes in. The OP was asking
about the physical layer, as specified by "AM/FM ..." etc..

The standard is APCO 25, which defines BW to be 6Khz and Modulation as
C4FM.

For more details see: http://www.apcointl.org/frequency/project25/

--
Korbin Dallas
The name was changed to protect the guilty.

On Sat, 01 Oct 2005 19:48:00 GMT, Korbin Dallas
said in rec.radio.scanner:

On Fri, 30 Sep 2005 23:45:46 -0400, Al Klein wrote:

On Sat, 01 Oct 2005 01:43:09 GMT, Korbin Dallas
said in rec.radio.scanner:

On Fri, 30 Sep 2005 11:29:31 -0400, Al Klein wrote:
On Fri, 30 Sep 2005 13:35:23 GMT, "Jim Hackett"
said in rec.radio.scanner:

Digital?

Most of what we call "digital" is NFM or SNFM.

Actually "Digital" is C4FM.

And the modulation on the carrier is??? AM? PM?? FM??

What bandwidth is it?

There's a difference between the process of putting information on the
carrier and the format that information comes in. The OP was asking
about the physical layer, as specified by "AM/FM ..." etc..

The standard is APCO 25, which defines BW to be 6Khz and Modulation as
C4FM.

Again - what's the physical layer? Id the frequency of the carrier
changed? The amplitude? The phase? Some other characteristic of it?
The OP wasn't asking about the logical layer (which is where C4FM
sits), he was asking about the physical layer.

i guess i was trying to find out how many ways signal can be modulated.
even if the signal is digital, isn't it still modulated in fm?