Whats the the difference Between 3600 and 9600 Baud?

[Waldo325mvfd]

Can any one help me out with the differences betweem 3600 and 9600 baud.

oh yea will I be able to pick up Smartnet with A BC250D

:? 8)

 

[crayon]

Baud is the term used to describe the rate at which data is transfered. The higher the numbers the faster it goes ..

 

[INDY72]

Simply put: 3.6kbps rate is the first version of the apco 25 digital format available also called APCO P-25 Phase I,... it can be used as a mixed mode format with both analog, and digital Talkgroups, and is the most common format out there right now. 9.6kbps is called true P-25and is APCO P-25 Digital exclusive. It is the newest format on the market and is still pretty rare. There is no analog on a 9.6kbps system. It is a higher baud rate of data transfer than 3.6kbps. To recieve and decode a 9.6kbps system you will need a BC296D, BC796D, or a PRO-96. Most trunktrackers will decode the cc on a 3.6kbps system but will not decode the digital voice,.. any of the digital scanners will do the 3.6kbps voice.. BC250D/785D, BC296D/796D and PRO-96.

 

[Voyager]

Can any one help me out with the differences betweem 3600 and 9600 baud.

oh yea will I be able to pick up Smartnet with A BC250D

:? 8)

About 6000 bits per second. :wink:

3600 and 9600 are, as stated above, the data rates at which the data is transferred. If you were ever on dial-up internet, you may recall 56K was not the first connection speed. Before that there was 33.6K, 28K, Etc. It all started around 300 or less as I recall. It's exactly the same thing with data over the air - 9600 is just a faster way of sending data from one point to another (nearly 3 times as fast). The same is true for DSL (768K) vs Cable (3M, or 3000K) - these are all different rates of speed.

Now, from a technical aspect, 9600 is a four level data transfer as opposed to the 2-level transfer of 3600. Rather than just high and low (2-level), you have two degrees of high (high high and low high) and two more of low (low low and high low) with 4-level. But, that's really not relevant for most scanner users to know.

Next will likely be 19.2K (19200) data channels when the need for more speed comes into play.

Actually, milf, I believe 3600 was APCO P-16 compliant only, and was never P-25 spec. I would be wrong on that. That's why 9600 systems are also called P-25 systems. Uniden was jumping the gun when they advertized the BC250D as P-25 ready.

A BC250D will only track 3600 systems and decode analog or digital, and not encrypted.

Joe M.

 

[GlacierClipper]

I remember modems being 9600 too! LOL!
It was in an old Tandy "Radio Shack"computer.

 

[N_Jay]

3600 Bits per second (3600 Baud, due to 2 level modulation) is the data rate used on the control channel of Motorola's designed trunking systems.

Yes they had systems that used Astro and Astro 25 voice channels on those systems.

9600 bits per second (4800 Baud, due to 4 level modulation) is the data rate used on the P-25 trunking control channel.

9600 bits per second (9600 Baud, due to the 2 level modulation) is also the data rate used on EDACS systems. Don't confuse the data rates as being the same to imply any compatability.

So in effect "36000 Baud" and "9600 Baud" have become shorthand to delineate between systems running Motorola's proprietary control channel and those running P-25 standardized control channel.

P.S. Look up Baud in an encycolpedic dictionary, it referes to the "Signalling Rate". Common dictionarries are starting to carry the misstaken deffinition of "Bits per Second" which is only true in 2 level or 2 state systems.

It should aslo be written with an initial capital since it is derived from a persons proper name, like Volt, Amp, Watt, Hertz, and many other technical measurments.

 

[DonS]

It should aslo be written with an initial capital since it is derived from a persons proper name, like Volt, Amp, Watt, Hertz, and many other technical measurments.

Though they perhaps should be, the names of such units are not written with initial capitals.

According to SI (Le Système International d'Unités), the following are some basic international units:

Quantity                        Name     Symbol
-----------------------------   ------   ------
Electric current                ampere     A
Power                           watt       W
Electric potential difference   volt       V
Frequency                       hertz      Hz

http://www1.bipm.org/en/si/base_units/
http://www1.bipm.org/en/si/derived_units/2-2-2.html

In fact, the rule is that the name of the unit is always written in lowercase while the symbol, if derived from the name of a person, is in uppercase. The only exceptions are "degree Celsius" and when the name is the first word of a sentence.

http://www.bipm.org/en/si/si_brochure/chapter5/5-2.html

-Don

 

[AZScanner]

9.6kbps is called true P-25and is APCO P-25 Digital exclusive. It is the newest format on the market and is still pretty rare. There is no analog on a 9.6kbps system.

Still pretty rare? Not around here! :shock: We've got Glendale, Phoenix AND Mesa compared to two P25 Phase I systems, one at luke afb and then the county system. And there's a lot of scuttlebutt going around in the smaller agencies that they will likely piggyback onto one of the 3 9600 systems. Pretty soon (within the next 2 years, I'd say) you're going to need a digital trunktracker to monitor any public safety out here. It's the latest and greatest new craze.

-AZ

 

[AZScanner]

Next will likely be 19.2K (19200) data channels when the need for more speed comes into play.

Oh geez, I hope not... I'm still paying off this 9600 baud scanner I just recently bought! Besides, these 9600 systems are hard enough for the scanner to lock onto most times - I can't imagine trying to go 2x faster.

-AZ

 

[N_Jay]

It should aslo be written with an initial capital since it is derived from a persons proper name, like Volt, Amp, Watt, Hertz, and many other technical measurments.

Though they perhaps should be, the names of such units are not written with initial capitals.

According to SI (Le Système International d'Unités), the following are some basic international units:

Quantity                        Name     Symbol
-----------------------------   ------   ------
Electric current                ampere     A
Power                           watt       W
Electric potential difference   volt       V
Frequency                       hertz      Hz

http://www1.bipm.org/en/si/base_units/
http://www1.bipm.org/en/si/derived_units/2-2-2.html

In fact, the rule is that the name of the unit is always written in lowercase while the symbol, if derived from the name of a person, is in uppercase. The only exceptions are "degree Celsius" and when the name is the first word of a sentence.

http://www.bipm.org/en/si/si_brochure/chapter5/5-2.html

-Don

Well you learn something new every day!

 

[mlevin]

Does the higher tranfer rate decrease the dlay when keying up the radio? I know it wouldn't affect the voice delay on the voice channel being that the 9600 baud only refers to the tranfer rate of the CC and not the rate that the radio decodes the digital. But what about key up time?

 

[mikey60]

9.6kbps is called true P-25and is APCO P-25 Digital exclusive. It is the newest format on the market and is still pretty rare. There is no analog on a 9.6kbps system.

Still pretty rare? Not around here! We've got Glendale, Phoenix AND Mesa compared to two P25 Phase I systems, one at luke afb and then the county system. And there's a lot of scuttlebutt going around in the smaller agencies that they will likely piggyback onto one of the 3 9600 systems. Pretty soon (within the next 2 years, I'd say) you're going to need a digital trunktracker to monitor any public safety out here. It's the latest and greatest new craze.

And don't forget These

* The state of Michigan (Yes, the entire state is covered)
* Parts of Minnesota (Eventually Statewide)
* Parts of Alaska (Again eventually statewide)
* Hamilton County Ohio (Supposedly the entire state within the next year)
* Some systems in Georgia

I'm sure there are others, these are the ones I thought off just from memory.

Mike
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