newbee

[1coolman]

Hello

I decided I would get into scanning being I am on the road a fair bit and I enjoy hearing what is going on.

I figured I would start out with something easy and started and just scanning or searching a 1 small range at a time.

I found a freq and the first day I was hearing what I think is everything. the next day I tuned in to that freq and all I get is one side of the conversation 90% of the time.

From reading I think this is a trunked system.

I did some searching and all I can find on the internet is who the freq belongs to in this area, nothing else.

Based on the conversation I am hearing it is the base freq and if I am a couple blocks from the base reception get very poor.

I would think this system would have a repeater some where because they have service trucks all over the county.

How would you go about finding out what the out put freq is and if it is a trucked system?

any help is greatly appreciated

 

[SCANdal]

I'm feeling playful today. Let's start the "20 Questions" routine this way...

What book were you reading?

 

[coldbricks]

Generally speaking, if it's 800MHz, you can almost guarantee its a trunked system these days. This is good because you know it is, but bad because trunked systems open up a world of questions for who you are listening too.

Ill try to help you understand a trunked system.

First, a trunk system DOES have a center frequency, but it is the data control channel. This sounds like digital noise and no voice. This control channel is the master for all the other radios to follow. A trunked system then has a few actual frequencies for voice. On these you will hear the voice chats, the talkgroups. You CAN hear a talkgroup by scanning through the 800mhz band, but you can only MONITOR (actually listen to the entire talkgroup and both sides of the conversations) but programming the control channel into your scanner. In other words you must have the control channel and (sometimes) every other voice frequency to monitor the trunked system. I hope that helps

Also trunked systems are usually not weak, the reason being most are large and cover entire towns/countys as to offer the trunked system to as many people as possible. That is one main advantage to the trunked setup

 

[SCPD]

you may get more info by asking In the Canada forums

 

[SCANdal]

Do we really know anything?

...or, at the very least, by giving us more details.

coldbricks, I think you're jumping to conclusions based on what little solid detail was provided by the OP. Also, not all trunked systems have "center" frequencies. Motorola and M/ACom (GE) trunked systems have control channels as you describe, but EFJohnson Logic Trunked Radio and Passport are examples of trunked systems that do not.

SCANdal

 

[1coolman]

I have been plugging away here and here is the freq that I hear only part of the conversation at times 169.24500
The more i look I am beginning to think this is a duplex system but I can not get both sides of the conversation.