LFRfreak
Member
What's the difference between analog and conventional?
Analog vs. Conventional
- Thread starter LFRfreak
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eyes00only
Member
Just my guess, and certainly not gospel ; 856.0625 could be analog (not digital, ie trunked), or part of a trunked system (digital), and 154.070 or 453.900 would normally be conventional. I'm sure this is not 100 % correct, and expect to here from Jim soon......................LOL
Jerry
:roll: 8) :wink: :lol:
Jerry
:roll: 8) :wink: :lol:
Analog refers to the type of modulation. Conventional refers to the system type and means it is not a trunked system.
A conventional system could use analog or digital modulation.
Analog modulation could be used on a conventional or trunked system.
Mike
A conventional system could use analog or digital modulation.
Analog modulation could be used on a conventional or trunked system.
Mike
LFRfreak
Member
mdulrich said:
So something that is digitally modulated isn't trunked? What's the difference between digital and analog modulation?
dynamitedjs
Member
LFRFreak, with the internet being such an abundant amount of information, (that we really don't need to repeat the answer to your question here), put this phrase in your search browser and find out.
What's the difference between digital and analog modulation?
What's the difference between digital and analog modulation?
LFRfreak said:
Digital and analog are both methods of modulation. Either one can be used on conventional or trunked systems. Analog modulation can be used on conventional systems or trunked systems. Digital modulation can be used on conventional systems or trunked systems. A conventional system can use analog or digital modulation. A trunked system can use analog or digital modulation.
Analog modulation is what we have been hearing on scanners for years. It is what your AM/FM radio and TV uses. Digital modulation is the new kid on the block.
Mike
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Let's see if I can make this a painless as possible.
Modulation:
Is the way voice is put onto a carrier wave and trasmitted over the air.
Analog Modulation:
Voice is converted into a wave form, and then combined with a carrier, and transmitted. It's either AM(Amplitude Modulation) or FM(Frequency Modulation.) There are some others but they all are derived from these two main types.
Digital Modulation:
Voice is converted into a digital data stream (1's and 0's) then combined with a carrier and transmitted. There is different types of these too but I don't want to go into them cause they are much too complecated for what you are woundering.
Hope this helps,
Kevin
Modulation:
Is the way voice is put onto a carrier wave and trasmitted over the air.
Analog Modulation:
Voice is converted into a wave form, and then combined with a carrier, and transmitted. It's either AM(Amplitude Modulation) or FM(Frequency Modulation.) There are some others but they all are derived from these two main types.
Digital Modulation:
Voice is converted into a digital data stream (1's and 0's) then combined with a carrier and transmitted. There is different types of these too but I don't want to go into them cause they are much too complecated for what you are woundering.
Hope this helps,
Kevin
- Joined
- Apr 30, 2002
- Messages
- 344
Now with reguard to systems.
Conventional
Really only two ways to operate.
Most simple(Simplex):
You transmit on one frequency and the other guy hears you on the same
frequency. Easy as that.
Little more complex(Duplex):
Using a Repeater, you transmit on one frequency, repeater hears it and re-transmits it on a different. you receive on a different frequency than transmit.
Trunked
Hundreds of ways.
Main parts of the system. Controller and a bunch of repeaters.
Your transmit on a frequency that the controller decides on, which inturn opens a repeater for that frequency and allows it to work like Duplex above. Your radio and all others on the system are listening to the Control Channel which is what the controller is sending out telling which radios to transmit on what frequency and what talkgroup.
Keep in mind this is really really really basic. It is actually much more complecated then I have made it sound. It get's even more when you start talking about Statewide systems and such.
Now, don't think that for a system to be Trunked it has to be on 800mhz. You can operate any modulation on any frequency and convetional on any frequency. Trunked systems, for now, are only VHF(100-200mhz range) UHF(200-900Mhz range.)
If you have any further questions, please go a head and write, I'll try and help to the best of my ability.
Kevin
Conventional
Really only two ways to operate.
Most simple(Simplex):
You transmit on one frequency and the other guy hears you on the same
frequency. Easy as that.
Little more complex(Duplex):
Using a Repeater, you transmit on one frequency, repeater hears it and re-transmits it on a different. you receive on a different frequency than transmit.
Trunked
Hundreds of ways.
Main parts of the system. Controller and a bunch of repeaters.
Your transmit on a frequency that the controller decides on, which inturn opens a repeater for that frequency and allows it to work like Duplex above. Your radio and all others on the system are listening to the Control Channel which is what the controller is sending out telling which radios to transmit on what frequency and what talkgroup.
Keep in mind this is really really really basic. It is actually much more complecated then I have made it sound. It get's even more when you start talking about Statewide systems and such.
Now, don't think that for a system to be Trunked it has to be on 800mhz. You can operate any modulation on any frequency and convetional on any frequency. Trunked systems, for now, are only VHF(100-200mhz range) UHF(200-900Mhz range.)
If you have any further questions, please go a head and write, I'll try and help to the best of my ability.
Kevin
eyes00only
Member
dynamitedjs said:
Mike & Kevin are a great example of what this site is all about!
Good work guys!
Jerry
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